Category Archives: Trees

Gustavia superba – A tropical beauty

I was recently introduced to a tree called Gustavia superba by a colleague. The specimen that he showed me was a relatively young specimen and was in flower. The blossoms each measures about 10 cm across. Petals are pinkish in colour and in the center of each flower, there is a dense ring pink coloured stamens that are each tipped in gold.

The flowers of this tree reminded me of the tropical equivalent of peonies because I received a Chinese New Year greeting card before which featured the flowers of this tree. Although Gustavia superba is well-adapted to the climate of Singapore, it does not flower readily. This tree, which belongs to a rather obscure family of plants, Lecythidaceae, will do best in a location with well-draining soil and exposed to full sunlight. One can see several mature trees in Malcolm Road Park in Singapore.

Commonly called embrillo, sachamango and the heaven lotus, Gustavia superba is native to tropical lowlands from Ecuador to Panama and Venezuela. It is a medium-sized tree that can attain a height of 5 to 10 m and has a relatively straight trunk. It usually adopts an unbranched growth habit according to various sources and features a cluster of leaves at the growing tip which makes the tree look like a palm. In larger and more mature trees, a few large branches can sometimes be seen and each will bear a cluster of leaves at the end. The leaves of this tree are lanceolate in shape and have toothed margins. When they first appear, they take on an attractive, coppery colour before they turn green when they approach maturity.

After the flowers fade, fruits that are round or pear-shaped with a hard rind form. Take a look at this blog post to see how the fruits look like. From the same blog, the fruits were reportedly said to be edible and inside contained one to four large smooth seeds surrounded by a yellowish orange pulp that is rich in vitamins A, B, and C. In its native habitat, it is said that agoutis (rodent species that inhabit areas of Central America, the West Indies and northern South America) forage for the fallen ripe fruits where they consume the seeds but may also bury some for later use. Those that were buried but forgotten will then have a chance to grow into new plants. As such, these rodents also help to disperse the seeds of this beautiful tree.

The pumpkin-like Surinam Cherry

I am particularly intrigued by the fruits borne by Eugenia uniflora which appear like red little pumpkins when they are ripe. Commonly known as the Surinam cherry, Brazilian cherry or Cayenne cherry, it is a member of the Myrtaceae family. Common tropical fruits like the guava are also members of this family.

Eugenia uniflora is native to tropical America and grows as a large shrub or small tree with a beautiful conical canopy. It is a slow grower and can attain a height of about 8 m. Its leaves are roughly shaped like diamond and mature ones are glossy green. This shrub becomes rather ornamental whenever there is new growth as the new leaves put forth are reddish copper in colour. In an edible garden, several Surinam cherry plants can be grown as a hedge.

The flowers of Eugenia uniflora can sometimes appear singly or in clusters of four. Because of instances that flowers may appear singly, this species probably earned its species name, uniflora this way, which has the meaning of ‘single flower’. The flowers are small and white in colour and reported to be fragrant.

After the flowers fade, ribbed fruits with an appearance that is akin to Chinese pumpkins appear. They are green at first and as they ripen, they take on a reddish hue. When fully ripe, they are dark red in colour and fall into the hand at the lightest touch. Internet sources state that there is another cultivar with fruits that are blackish red in colour. Mature fruits are small and measure up to only 2 cm in diameter.

The taste of the pulp ranges from sweet to sour, depending on the cultivar and level of ripeness. Fully ripe fruits are not resinous to taste and can be quite sweet when consumed out of hand. The unripe ones which appear green to orange are tart and sour. Fruits are rich in Vitamin C and can be used as a base for jams and jellies and flavour various confections. Brazilians ferment the juice into vinegar or wine, and sometimes prepare a distilled liquor.

After enjoying the pulp, one can either find one fairly large, round seed or two or three smaller seeds each with a flattened side inside. Note that the seeds are extremely resinous and should not be eaten. Diarrhoea has occurred in dogs that have been fed the whole fruits by children.

In HortPark’s Kampong Daze, one would be able to find a Eugenia uniflora plant there. I planted it there earlier this year and the location where it is grown is a little waterlogged. To date, surprisingly, it not only survived, it even flowered and fruited! According to the webpage based on the book entitled ‘Fruits of warm climates’ by Julia F. Morton, it was stated that Eugenia uniflora can grow in a range of soils and can withstand waterlogging for a time! It is intolerant of salt.

Plants are propagated from seeds and should be grown under full sun. Soil should be kept moist at all times. Note that a strong, spicy smell will be given off when the plant is being pruned and that can irritate the respiratory passages of sensitive persons. Interestingly, the leaves of Eugenia uniflora have been spread over the floors of Brazilian homes because when they are walked upon, they release their pungent oil which can help to repels flies! They also possess medicinal properties!

For more information, do refer to the write-up on Eugenia uniflora in ‘Fruits of warm climates’ by Julia F. Morton via this URL – http://www.hort.purdue.edu/newcrop/morton/surinam_cherry.html.

‘SPICE’ up your life!

For the month of June, visitors to the Lifestyle Corner at HortPark had the chance to savour the sight and smell of more than 30 types of common and exotic dried spices in a special showcase of spices. They were also able to view various live spice plants, such as the pepper vine, clove, candlenut and asam gelugor trees on the Timber Deck.


Spice showcase at HortPark Lifestyle Corner.
  


Wilson sharing facts on spice gardens with the audience.

 In conjunction with the showcase, a talk-cum-demo entitled “SPICE up your life!” was conducted on Saturday (13 Jun 09). More than 30 participants turned up and learned interesting facts about spice trees and how to set up a simple spice garden. Spices such as clove, nutmeg and candlenut and leaves from their respective trees were passed around during the interactive session for the audience to take a closer look.


Leaves and fruits from spice trees were passed around in the audience.

 

Students from Teck Whye Secondary School Art Club showing the making spice pouch magnets to the audience.

Students from Teck Whye Secondary School’s Art Club also gave a demonstration that taught participants how to make attractive spice gifts using spices. At the end of the session, each participant received a spice magnet as a parting gift and was then brought on a guided tour of the Lifestyle Corner.

Fragrant spice ornaments you can display in your house.

You can still view the spices showcase at HortPark even after the month of June as the entire collection will be relocated permanently in the kitchen section of the Lifestyle Corner. So come down to HortPark and ‘SPICE up your life’ with us! Spices will never be the same again!

The Beautiful Butterfly Pea Tree

I first encountered Clitoria fairchildiana outside the Pasir Panjang Nursery office where I now work. It is a beautiful tree that is also known via another synonymous botanical name, Clitoria racemosa. There is very little information about this tree on the Internet and I got to know more about it when I flipped the pages of a National Parks Board (NParks) publication entitled ‘Trees of our Garden City – a guide to the common trees of Singapore’ that was edited by Tee Swee Ping and Wee Mei Lynn.

Clitoria fairchildiana is referred to via a handful of common names which include the butterfly pea tree and Philippine pigeonwings. It is an evergreen, small- to medium-sized tree that attain a height of 15 m. The crown is umbrella-shaped with numerous branches that take on a weeping habit. In Singapore, Clitoria fairchildiana is planted along roadsides, in parks, garedns and open spaces. It can be used to achieve a ‘closed forest effect’ by planting in groves.

It is a fast- and large-growing legume belonging to the bean family, Fabaceae and has those characteristic trifoliate leaves.  Largely distributed in Brazil, Clitoria fairchildiana produces beautiful flowers handing from pendant spikes that can be white, pale blue or purple in colour.

The flowers of this tree resemble those produced by the blue pea (Clitoria ternatea) which is a related species. The flowers of the latter plant better know for being traditionally used to colour various Peranakan (Straits Chinese) confectionaries. Interestingly, Clitoria fairchildiana is a large tree whereas Clitoria ternatea is a small, wiry vine.

The fruits of Clitoria fairchildiana are large woody pods that can measure up to 20 cm long. I once kept a few mature dry brown pods in my room and I was startled late one night when one of them suddenly split open! When that pod split, it emitted a loud crackling noise and the flat, disc-like seeds were purged in various directions.

You may have noticed the strange-sounding genus that this tree has. The genus name Clitoria was indeed derived from the word clitoris! Linnaeus, who coined the name, was inspired by the appearance of flowers produced by plants belonging this particular genus, which resembled that certain part of the female anatomy!

Special thanks go to my colleague, Keneric Ng, who has helped to take the excellent photos of the Clitoria fairchildiana tree that is growing outside our office.

So Pretty but so SOUR!

Flacourtia inermis is a fruit tree that is commonly known as lobi-lobi and tomi-tomi in Indonesia, rukam masam and lovi-lovi in Malaysia. The plant is a fruit tree that can grow up to a height of 15 m. Some internet sources indicated that it is native to Malaysia but according to the Plant Resources of Southeast Asia (PROSEA), this tree is said to be only known in a cultivated or semi-cultivated state, widespread from India through Malesia to New Britain.

Several individuals of Flacourtia inermis can be seen being planted in the grounds of HortPark (the Gardening Hub of Singapore located off Alexandra Road). It is an ornamental tree that can be planted in a park or garden. The tree’s mature leaves ovate-oblong to ovate-elliptic in shape and are glossy on the upperside. The young flushes of leaves with toothed margins are particularly attractive as they are bright orange in colour. This colour fades off to become a green colour as they mature. Some varieties have been distinguished, based on differences in leaves.

Flacourtia inermis produces very attractive bunches of fruits that measure up to 2.5 cm in diameter and appear as globose, deep red berries when they are ripe. Like many other fruits, they are green when they first appear. Tempting as they were, the ripe red fruits, however, in my opinion, are not exactly palatable as I find them very acid and astringent to taste. They are said to be excellent for making tarts, jams, syrup and preserves.

Like many other fruit trees, Flacourtia inermis can be propagation by using seeds. When there is a tree available, one can propagate it via air layering or budding. It prefers to be grown in a location where it can receive full, direct sunshine and in soil that is well-draining, fertile and moisture retentive. Mulch around the base of the tree using organic compost or manure to promote growth. Flacourtia inermis is not tolerant of waterlogged conditions though. The tree does not produce fruits all year round. In Java where the climate is relatively similar to Singapore, the tree flowers in January and February and fruits ripen after 4—5 months.

Tembusu in Flower!

It is the time of the year where the tembusu tree (Fagraea fragrans) is in flower again. All trees in Singapore have synchronised to flower together! The pretty five-petalled flowers are borne in a bunch. When they first opened, they are white and they gradually turn yellow and finally light orange before they fade. They also emit a distinctive and delightful fragrance. Whenever there is a light breeze, the perfume emitted by the large number of opened flowers will be brought to one’s nose. After the flowers fade, the tree produces red but bitter-tasting berry-like fruits.

The tembusu, with its pagoda-shaped crown, is a relatively common ornamental tree in Singapore. Its trunk is covered with a deeply fissured bark and the tree has an irregular canopy shape and leaves are light green and oval in shape. The tembusu tree can be found growing on the roadside, public parks and neighbourhood residential areas. The tree that has been pictured on the reverse side of the Singapore five-dollar bill is the large tembusu tree that is growing in Lawn E in the Singapore Botanic Gardens.

Well known to be a very hardy tree species belonging to the Loganiaceae family, the tembusu is native to Southeast Asia and India. It is reported to be able to thrive and bloom under poor growing conditions and can grow in a wide range of soil types from poorly aerated, compact clay soils to poor sandy, shallow sandstone soil. The tembusu is a riverine tree that is also tolerant of growing in soils with running water. It can be found growing in light primary and secondary forest in humid or seasonally inundated locations.

This tree can grow quite large and capable of reaching a height of about 25 m. Tembusu has medicinal properties where its bark is boiled and the resulting decoction is used as a febrifuge and a decoction of twigs and leaves is used to control dysentery.

What is very well known about the tembusu is that its wood is very hard and durable that is resistant to rot and termite attacks. Timber from the tembusu tree has been used in heavy construction. Did you know the chopping boards we see at the chicken rice or butcher stalls in Singapore are also made from timber from the tembusu?

A flushing Cowa Mangosteen Tree

A Garcinia cowa tree, draped in a vivid red colour is currently screaming for attention at HortPark . This flaming beauty is one of the trees that are planted in the HortPark’s Garden Patch and can be located near the display plot adopted by Crystalene Products (Singapore) Pte Ltd.

Related to the common mangosteen (G. mangostana) and assam gelugor (G. atroviridis), G. cowa is commonly known as the cowa mangosteen and can be found growing wild in evergreen and semi-evergreen forests, streams and valleys in the area that extends from eastern to north-eastern India to Indo-China. It is also cultivated within and outside this geographical area.

Garcinia cowa can grow up to a height of about 12 m tall. The tree has numerous pendulous branches,with shiny leaves that are broadly lanceolate in shape. Young leaves that emerge are bright red in colour, which make the tree look highly attractive whenever new growth is produced. This characteristic is not unique to this species and can be seen in a handful of other Garcinia species.

Interestingly, this evergreen tree is dioecious, which means that separate sexes occur on separate trees. The ribbed fruits produced by female trees are about the size of a small orange which turn dull red when ripe. They are edible but not exactly palatable due to the sour taste of the pulp that is orange in colour. In Vietnam, the fruits are a source of natural citric acid that is used to flavour sour fish and crab soup. Besides the fruits, its young shoots and leaves are also edible and are featured as a food additive in many local Thai dishes.

Besides food and ornamental uses, the cowa mangosteen tree is sometimes used as a rootstock for grafting the common mangosteen tree.

Dischidia nummularia climbing up the tree!

Dischidia nummularia is one plant that is easily overlooked. First, it is not a very showy vine to start with. Second, it does not produce large, showy or colourful flowers. Finally, it has such small leaves that will not catch one’s attention. One will easily dismiss it as a weed. But this plant is quite prevalent in Singapore’s landscape. One will find it climbing its way around old tree trunks and sometimes, long and massive chains of it can be found dangling from the branches of some wayside trees.

Dischidia species are close relatives of Hoya and both genera belong to the frangipani family, Apocynaceae. Dischidia nummularia is sometimes known as pebble beach and button orchid. The latter name is a misnomer as Dischidia nummularia is not an orchid at all! The first name is quite amusing but it is imaginable that a large mass of this plant will create an visual picture that can be likened to a beach full of pebbles! For those who want to know its Chinese name,  is Dischidia nummularia is called “圆叶眼树莲”, which translates into ’round leafed dischidia’.

Dischidia nummularia is an epiphytic vine with small, orbicular to ovate leaves that are arranged oppositely along a thin stem. Viewed from the side, the tiny leaves look like little convex lenses! As the plant climbs its way around a tree trunk, it will form roots at the nodes where they will help the vine to cling onto the bark for support and for absorption of water and nutrients. When the plant is injured, it exudes a white latex from the wound.

With everything so small, it is easily envisaged that the flowers borne by Dischidia nummularia would be very tiny too.  Indeed, the flowers are quite difficult to spot. They are white in colour and are produced in a cluster. Each flower only measures about 3 to 5 mm across.

Interestingly, it has medicinal uses. Stated in PROSEA, the latex of Dischidia nummularia is applied as an anodyne to wounds caused by fish spines and the decoction of its leaves is drunk to treat gonorrhoea in the Moluccas. In Java, the latex exuded by the plant is used to treat sprue in children. In Thailand, the plant is used against cirrhosis!

This plant is native to Singapore but can also be found growing in Eastern India, Myanmar, Indochina, Thailand, throughout Malesia and all the way to northern Australia. This plant may sometimes piggyback itself on orchid plants and various other plants that are grown epiphytically. Occasionally, one will find this plant on sale in nurseries. It may be sold as a small plant wrapped around a piece of driftwood or grown dangling from a snail shell.

It is not exactly a fast grower and hence do not worry that it will take over your balcony. Dischidia nummularia likes to be grown somewhere where it can get bright light. Six hours of filtered sunshine on a bright balcony or window ledge will be beneficial. It also loves high humidity. This vine should be grown in a porous but moisture-retentive growing mix. Roots should be dry out a little before the next watering.

Claoxylon indicum in bloom!

Recently, Keneric Ng, my colleague in HortPark wrote an interesting article on a tree that was unknown to me. It was a Claoxylon indicum specimen that was spotted by him just after Alexandra Arch, right at the start of the Forest Walk. The text below is what he wrote that is bundled together wtih a selection of photographs which he took.

Wanna make a guess which plant(s) am I highlighting? And where? Cocos? Terminalia? Spathodea? Claoxylon? Samanea? Caryota? Paraserianthes?

Bingo or not. There you have it – Claoxylon indicum. Known by the Chinese as 白桐树 (Bái Tóng Shù). The 白 (white) in the name is probably an impression, referring to the short, dense, matted hairs (tomentose) that cover the tree, and especially prominent on younger parts. This handsome specimen is located just after Alexandra Arch, right at the start of the Forest Walk.

Once again, I was lucky to be at the right place at the right time. I needed photographs of Saga tree that morning but before I could get my act together, this Claoxylon tree distracted me first. I enjoyed such happenstance tremendously. The tree is a crown full of flowers, totally covered to every inch. It reminded me of fireworks.

The inflorescences/flowers are distinctively that of a Euphorbiaceae-Acalypheae. In fact, one is likely to be reminded of certain acalyphas e.g. the very ornamental shrub – Acalypha hispida, owing it to its habit and manner of flowering. In fact, I started my name-hunt for this tree from words like ‘Tree Acalypha’ and ‘Acalypheae’ but got bumped around till I got it.

Like other Acalypheae, Claoxylon indicum is dioecious (dioecious refers to a plant with either male or female flowers but never both). Notice the puffed flowers, with many short ‘tentacle’ projections? This is a male
Claoxylon indicum and a very handsome one. It is recorded that the staminate (male) racemes can grow as long as 40 cm, while the pistillate (female) racemes are only 7 – 12 cm long and much compacted.

This small tree is native to Singapore. It can reach 20 m tall. Something I found out is that, the wood of the tree produces suffocating smoke when burned, so it is not suitable as firewood.

I have always noticed the existence of this tree, especially at forest edging and disturbed vegetation but never seriously till it flowered like that. Some trees really need to flower hard to get our attention. I wondered…how many Southern Ridges visitors had noticed this ‘firework’ too?

It is right at the bend where the red star is. With so many views of the tree, I’m sure you know how the tree looks like by now! Ha! Go catch it while it last! The lucky thing is…this ‘firework’ lasted more than a few seconds.

Interesting Papaya Tree

Just early last week, I received yet another email that reported an interesting plant discovery by Mr Keneric Ng from the National Parks Board (NParks).  This time, he spotted an unusual form of papaya tree (Carica papaya) that was found growing in a wasteland in the vicinity of Farrer Road.

Keneric’s new find - an unlikely beauty growing in a wasteland.

All the papaya trees I have come across have green petioles. What was so different about this papaya tree that Keneric had documented was that it has purple petioles. This is the first time that I have been told that such a papaya existed! This feature somehow made this papaya tree look a little more ornamental that its all-green counterparts. In fact, I have always thought that well-grown papaya trees with their umbrella-shaped crowns  that feature large palmate leaves do make stately statements for a tropical garden.

Purple coloured petioles appear to not be restricted to papayas only. It can also be seen in cassavas, except that in this case, the petiole may be coloured red instead of purple.

With this morphological feature in mind, I recall that it is not unique to just papayas. The common cassava that we eat in desserts and a source of tapioca flour also has cultivars that have either all-green petioles or those that has red/purple coloured petioles.

A female flower of the papaya which usually occurs singly or in a small bunch consisting of a few flowers.

From the look of the flower this purple-petioled papaya plant had produced, it could either be a  female plant or a hermaphadite and hence, it has the ability to produce fruit. I wonder whether will the fruits of this plant be purple or green when young and would they turn orange when ripe?

Take a look at the two pictures of similar-looking papaya plants below (accessible via the URLs) which I managed to find via the Google search engine that were put on the New York Botanical Gardens’ Ethnobotany and Floristics of Belize Photo Gallery:

Male plant with flowers in sprays – http://www.nybg.org/bsci/belize/Carica_papaya_1.jpg

Female plant with green fruits – http://www.nybg.org/bsci/belize/Carica_papaya_2.jpg