Chisocheton lasiocarpus

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Chisocheton lasiocarpus
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Sapindales
Family: Meliaceae
Genus: Chisocheton
Species:
C. lasiocarpus
Binomial name
Chisocheton lasiocarpus
Valeton

Chisocheton lasiocarpus is a species of tree in the genus Chisocheton of the Mahogany Family (Meliaceae). It is a sparsely branched, slightly buttressed, somewhat stout mesocaul or rather slender pachycaul tree of the western New Guinea rainforest rising to 110 feet (33 meters) in height, and possibly the only such tree with a weeping habit, the huge terminal rosettes of five foot (1.5 meter) long pinnate leaves of the lower branches facing down toward the earth. [1] Like all Chisochetons, C. lasiocarpus has indeterminate leaves with a tiny circinate bud at the tip of each leaf which produces a new pair of leaflets every few weeks or months over a period of several years, each leaf eventually reaching five feet (1.5 meters) in length. [2] There are 9 to 11 pairs of leaflets at a time (the oldest may die as new ones are formed). Each leaflet can be up to 18 inches (45 centimeters) long by up to nine inches (23 centimeters) in width. The flowers are white or pink, tubular, about a half inch (one cm) long with 4 or 5 petals and 7 or 8 stamens. [3] The tree is "myrmecophilous" (has a symbiotic relationship with certain ant species). C. lasiocarpus is a highly variable species. [4]

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Chisocheton pohlianus belonging to the Mahogany Family (Meliaceae), is a small, lower story, leptocaul rainforest tree from New Guinea no more than 26 feet in height and 2.75 inches thick. Like all Chisocheton species it has indeterminate, pinnate leaves in this case up to 6 ft 7in in length and having as many as 28 pairs of leaflets at any given time. Each time the tiny circinate bud at the tip of the leaf forms a new pair of leaflets, the leaf simultaneously produces, further back, a small 2 inch (5 cm) inflorescence, but not at the same spot as where a pair of leaflets are attached, but halfway between two pairs of leaflets. The jury is still out as to whether these are inflorescences fused to a leaf or whether the leaves have assumed reproductive function. The difficulty is in reconciling an indeterminate leaf with determinate inflorescences. The flowers are tubular, about one-half inch in length with 3 to ten petals, crème de menthe in color and said to have the fragrance of Cymbopogon.

Chisocheton macrophyllus in the Mahogany family (Meliaceae) is a pachycaul rainforest tree of the East Indies and Malay Peninsula with very few upright limbs (reiterations) ultimately reaching a height of 115 feet. Each reiteration is topped by a tight rosette of once-pinnate leaves up to ten feet in length with up to 28 pairs of leaflets at any given time, each up to 15.5 inches long by 4.5 inches (11 centimeters in width. Like all Chisocheton species, these leaves are indeterminate, forming a new pair of leaflets every few weeks or months. while the oldest pair may die. The cream colored flowers, 3/4ths inch long with 4 or 5 petals, are arranged in a thyrse up to 32 inches long, followed by pyriform capsules up to six inches in diameter with 2 to 4 seeds each the size and shape of a brazilnut.

Chisocheton polyandrus, of the Mahogany Family (Meliaceae), is a species of pachycaulous, unbranched trees variously called "palmoids", "maypole trees" or "Corner Model Trees" occurring among several families of unrelated trees. C. polyandrus is native to Borneo, and grows up to a height of 49 feet in height, and may have small buttress roots or even prop roots. It is topped by a tight circle of indeterminate, once-pinnate leaves up to 5.5 feet in length, which may eventually have up to fourteen pairs of leaflets, acquired one pair at a time over a period of several months or years, each leaflet measuring up to 17 inches long by 5.5 inches in width. In mature leaves the oldest pair may die when a new pair is formed. The unbranched inflorescences are up to 6.5 feet long with the flowers occupying just the last foot or so, eventually hanging straight down as the weight of the fruit increases. The flowers are tubular, one to 1.25 inches in length. Petals 5 or 6, white with red blush and having up to 14 stamens. The fruit has three seeds, each covered with a red aril.

References

  1. Mabberley, D.J. (1979). "Species of Chisocheton". Bulletin of the British Museum (Natural History), Botany. 6 (4): 307 (figure 1).
  2. Mabberley, D.J. (1995). "Meliaceae". Flora Malesiana. 12 (1): 152–154.
  3. Flora Malesiana op. cit.
  4. Flora Malesiana op. cit p 154