XCI. APOCYNACE M. 
345 
Dyer a.] 
Corolla-tube nearly as long as lobes; cymes peduncles 
short . . * (*) D, costulata 
Corolla-tube much shorter than lobes; cymes peduncled (2) D. laxiflora 
(1) D. costulata Hook. fil. Journ. Linn. Soc. xix. 293; King, 
l.c. 443; Burn-Murdoch, Trees and Timbers of Malay Peninsula, 
i, p. 19, with plates. 
Tree attaining a height of 250 ft. and nearly 7 ft. through; 
stem cylindric, no buttresses, bark grey, very laticiferous. Leaves 
6 to 8 in a whorl, oblong-ovate glaucous beneath; 3 to 7 in. long, 
1-5 to 3 in. wide; nerves 16 to 20 pairs, petioles 1 to 1*5 in. long. 
Cymes with peduncle, dense, 3 in. long. Corolla-tube ’I in. long, lobes 
*15 in. long. Follicles 9 to 15 hi. long, 1 in. or more across. Seeds 
2 in. long, 1 in. wide. Hab. Common. Whole peninsula in forests 
in low country, Singapore, Rogie. Malacca, Bukit Panchur; Bukit 
Sadanen (Derry). Selangor, Sungei Buluh (Foxworthy). Perak, 
Goping (Scortechini). Penang (Curtis). Distrib. Sumatra. 
These trees flower immediately after shedding their leaves, when the 
young leaves come on, so that herbarium specimens of flowers usually have 
only small leaves. 
(2) D. laxiflora Hook. fil. F.B.I. iii. 644; King, l.c. 444. 
Dyera costulata Ridl. Agric. Bull. ii. 95, Pis. iii and iv. 
A tree similar to the last except that the leaves are shortly 
acute at tip, rather larger; nerves 13 to 17 pairs. Cymes long and 
lax; peduncles over 3 in. long; branches over 1 in. long in pedicels 
*25 in. long. Corolla-tube -075 in. long, lobes oblong, - 2 in. long, 
*1 in. wide. Fruit rather larger than in D. costulata. Hab. As 
common as the last or commoner, in thick lowland forest. Singa¬ 
pore, Gardens, the big tree on the bandstand; Cluny Road. 
Malacca, Selandor (Cantley). Selangor, Kwala Lumpur (Fox- 
worthy). Perak, Batang Padang (Kunstler). Use: The wood is 
lighter, 19*5 lb. per cubic ft., and the yield of latex less than in 
D. costulata (Burn-Murdoch, Trees and Timbers of Malay Peninsula, 
i, p. 19, plates). 
14. ALSTONIA, Br. 
Trees, often vast (or shrubs); branches often whorled. Leaves 
usually whorled. Cymes corymbose or umbelliform, terminal 
often verticillate. Calyx-tube very small, lobes short. Corolla 
green or white, small, salver-shaped, tube cylindric, short, dilate 
round the stamens near top, lobes small. Stamens included; 
anthers lanceolate. Carpels 2; ovules many, pluri-seriate; style 
filiform; stigma cylindric usually bifid. Follicles long, cylindric, 
slender. Seed oblong ciliate with tufts of hair at each end. 
Species 30, 1 Africa, the rest Indo-Malaya, Australia. 
Very big trees ; nerves very close, parallel; corolla- 
lobes overlap to left; seed round at both 
ends. 
Ovary villous; corolla pubescent . . . (*) A. scholaris 
