24 Timehri. 
tree. So far, results have been obtained from forest trees, and whereas the yields 
of the first tappings were fairly satisfactory, subsequent tappings have not yielded 
so well and some of the rubber obtained has been “tacky.” From the 
established plantations of Sapium Jenmani results should soon be obtained from 
cultivated trees of known age. 
There is reason to believe that there are several varieties of Sapiwm Jen- 
mani. A pink tinged petiolar kind and a green petiolar kind are common. Rub- 
bers from these different kinds have not yet been collected separately for scientific 
examination. The Indians also appear to recognise two different kinds of Sapiwm 
J-nmani, but whether these represent simp y varieties or not has yet to be 
determined. : 
What appears to be another distinct species of Sapium, but slightly differ- 
ing from Sapium Jenmani, has recently been obtained from the Essequibo 
district. It appears to be common with Sapium Jenmani, and it is almost, if 
not absolutely, impossible to distinguish between it and that species until it is in 
fruit. The leaves are practically identical with those of Sapium Jenmani in 
shape and texture, but the male flowers are borne on single terminal spikes with 
no female flowers situated at the basal ends. After the male flowers have all 
opened and fallen, the greater portion of the spike falls and two lateral buds 
elongate into two short spikes bearing the female flowers, the result is that the 
fruits of this kind, instead of being borne on a single “ stalk ” as in the ease of 
Sapium Jenmani, are produced on two “stalks,” so that the fruiting branch 
is a branched one. This species is common in some of the cultivations in the 
North Western district. Rubber has been obtained from it from Fort Island, 
and further samples have recently been procured from some trees at the Bonasika 
Rubber Reserve where it is found amongst Sapiwn Jenmani. It would appear 
that the rubber from this species is equal in quality to the rubber of Sapiwm 
Jenmani but the question of relative yields has yet to be investigated. 
Sapium (7) paucinervum was first found by Mr. Jenman in the Pomeroon 
in 1886, but has subsequently been noted in various other districts. The tree 
is a large one and the leaves are broader than are the leaves of Sapium Jenmani. 
The edges are serrated and the lateral veins are irregularly distributed and rarely 
exceed more than 10 pairs. The apices of the leaves are blunt and are not 
hooked, but the petiolar glands are situated on a long curved stalk which is 
narrowed at the base. The flowers are unknown, but the fruits show three 
divisions clearly and are about 3-inch in diameter. The seeds are about 3-16 inch 
in diameter and are slightly rough. This tree is associated by the Indians with 
Sapium Jenmani, but the value of its “ rubber” has yet to be ascertained. 
Orner Latex-Propucina PLANTS. 
Forsteronia gracilis is a large woody “ bush-rope” widely distributed 
throughout the forests below a certain mean altitudinal range. The leaves 
are large, opposite and petiolate, while the flowers are found in terminal 
panicles, and the young shoots are characterized by numerous, well-marked 
lenticels. The latex runs freely when first tapped, but the flow rapidly falls 
off. A small sample of rubber was sent by Mr. Jenman for examination, but was 
