52 XOV. ASCLEPIADEE. (J. D. Hooker.) [ Dischidia. 
Peduncles 3 in. ; flowers subumbellate (in bud), white. Corolla subglobose. Coronal 
scales with very long narrow arms dilated at the tips; pollen-masses subobovate, 
eaudicles much dilated— Description from Griffith. 
DOUBTFUL SPECIES. 
D. Warricmn, Wight Contrib. 43; Wall. Cat. 8183; Dene. in DC. Prodr. viii. 
633; flowers and fruit unknown ; is probably not a Dischidia. . 
D. cravata, Wall, Cat. 4209, from Attran, is unknown to me; I have not found it 
in Wallich's Herbarium at the Linnean Society. 
44. HOYA, Br. 
Twining pendulous or rambling and rooting, rarely erect shrubs. Leaves 
opposite, thickly fleshy or very coriaceous. Flowers in axillary or terminal 
umbels. Calyx small, 5-partite. Corolla rotate, fleshy or waxy ; lobes 5, often 
convex and spreading or reflexed, valvate in bud. Coronal-scales 5, large, 
membranous fleshy or horny, adnate to the column, stellately spreading or 
ascending, turgid or compressed laterally or vertically, often concave on the 
upper surface, margins usually recurved so as to enclose a hollow space, the 
inner angle often produced into a tooth or spur which is erect or incumbent on 
the anther. Column short; anthers conniving over the stigma, membranous, 
tips inflexed or erect, rarely 0; pollen-masses various, solitary in each cell, 
waxy, pedicelled, erect. Stigma included, flat or the centre apiculate. Follicles 
various, usually slender, acuminate, with a thin pericarp; rarely turgid with 
very thick walls. Seeds very small, ovate or linear-oblong ; coma long. DISTRIB. 
Species about 60; tropical Asiatic, Malayan, and Australian. 
A most difficult genus to describe from dried specimens. Iam quite unable to 
adopt the sections established by Blume on the development of the coronal-processes. 
The description of the nervation of the leaves applies to herbarium specimens solely. 
The secondary nerves, and in most the primary, in perhaps all except H. coriacea, are 
invisible in the living plants, and there is no exact line to be drawn between those 
with 3-5 principal basal nerves, and those with alternate arched or straight, and more 
or less horizontal nerves. The peduncle is in very many species persistent and peren- 
nial, giving off a succession of flowers from tubercles towards its tip ; the result 1s 8 
cylindric thick end to the peduncle: it is not known whether this feature is common 
to all the species, nor even whether it is constant in any. The incurved or recurv 
form of the corolla probably affords a good character, but is lost in dried specimens. 
The coronal-processes are greatly distorted in drying, and the characters I have drawn 
from them must be accepted with reserve. The pollen-masses present great variations 
in size, form, and length of pedicels, and probably afford excellent characters. The 
follicles present wonderful variations, from the most slender and terete with thin 
pericarp of H. globulosa, to the thick cylindric with rounded lobed ends and exces 
sively thick pericarp of H. coronaria. The seeds of all are very small for the Order. 
_ Sect. I. Grytoceras. Corolla reflexed, lobes longer than broad. Column 
stipitate; coronal-processes very long, erect, with a long spur diverging from 
the base of each. 
l. H. multiflora, Blume Cat. Hort. Buit. 49, and Bijd. 1064. H- 
coriacea, Lindl. Bot. Reg. 1839, t. 18, not of Blume. Crytoceras reflexum, 
Benn. Fl. Jav. 90, t. 21. C. floribundum, Maund Botanist, iv. t. 178. Cen 
trostemma multiflorum, Dene. in Ann. Sc. Nat. Ser. ii. ix. 272, and in DC 
Prodr. viii. 634; Blume Mus. Bot. Lugd. Bat. i. 45; Bot. Mag.t. 5173. C 
Lindleyanum, Dene. in DC. l. c. : 
Maracca; on Mt. Ophir, Maingay. Punane (drawing in Herb. Kew).—Di1sTRIP- 
Java, Borneo, Philippine Islds. 
