XCII. ASCLEPIADACEAS* 
393 
Tylophora.] 
•3 to ’6 in. long. Peduncles short with 2 or 3 umbels of flowers 
on capillary pedicels. Bracts lanceolate. Sepals long narrow 
lanceolate hispid. Corolla-lobes ovate, yellow or dull pink. Corona- 
scales flat orbicular with free tips. Follicles dagger-shaped, 3 in. 
long, *25 in. through. Seeds ovate truncate. Hab. Sandy places 
by river or sea. Singapore, Changi. Pahang, Pekan and Sungei 
Meang; Leban Chondong, Rumpin River (Evans). Tringganu 
on an island in the river mouth. Distrib. India, Siam, Borneo. 
27. HETEROSTEMMA, W. and A. 
Slender twiner. Leaves fleshy membranous. Flowers small 
in sessile or peduncled inter-petiolar umbellate cymes. Calyx 
5-lobed. Corolla campanulate or urceolate, lobes triangular valvate. 
Corona processes often laciniate spreading horizontally from the 
column. Staminal column short depressed; anthers minute, 
appendage small. Pollinia 1 in a cell, erect sessile or with short 
caudicles. Style-apex 5-sided, not longer than anthers. Follicles 2, 
slender, straight. Seeds thin winged. Species 10, Indo-Malayan. 
Corolla campanulate rotate; cyme umbellate . . (1) H. piperifolium 
Corolla urceolate; flowers racemed .... (2) H. fimbriatum 
(1) H. piperifolium King and Gamble, l.c. 557. 
Glabrous twiner. Leaves membranous ovate-acuminate, trun¬ 
cate or cordate (var. cordatum) minutely puberulous on both 
sides; nerves 2 or 3 pairs from the base, fine; 2'5 to 3*5 in. 
long, i*5 to 2'5 in. wide; petioles slender, *75 to 2 in. long. 
Peduncles *5 to 75 in. long. Flowers about 6, yellow; pedicels 
*25 in. long. Calyx-lobes ovate. Corolla *3 in. across. Corona 
processes lying flat, linear-lanceolate, entire or laciniate. Follicles 
slender linear acuminate, 4 in. long, ’15 to 2 in. wide. Hab. Open 
woods up to 5000 ft. altitude. Selangor, Batu Caves (Burkill). 
Perak, Batang Padang River and Larut (Kunstler); Gunong Hijau 
(Scortechini); Kwala Dipang; Thaiping. 
(2) H. fimbriatum King and Gamble, l.c. 558. 
Twiner, stem with 2 longitudinal lines of hairs. Leaves fleshy, 
oblong or oblong-lanceolate acuminate; nerves 5 pairs prominent 
when dry; 3*5 to 4-5 in. long, 1*5 to 2 in. wide; petioles -5 to 75 
in. long. Flowers racemose; peduncles thick, *15 in. long; 
rachis of raceme *3 in. thick with cushion-like bracts; pedicels 
slender, *5 in. long. Calyx-lobes minute. Corolla ovoid urceolate, 
pubescent, *3 to *4 in. wide, lobes ^ of its length. Corona pro¬ 
cesses sub-erect, thick, fimbriate. Very rare. Hab. Perak G. 
Ijuk (Gunong Hijau) (Scortechini). 
I have not seen this species. 
28. HOYA, Br. 
Twining epiphytes rarely (H. multiflora ) erect shrubby, usually 
rooting at nodes. " Leaves thick and fleshy. Flowers showy, large 
