Flora of the Malayan Peninsula. 559 



27. HoYA, Br. 



Twining pendulous (rarely erect) or rambling and rooting, often 

 epiphytic, shrubs. Leaves opposite, usually thick and fleshy or cori- 

 aceous. Floicers in axillary, lateral or terminal, umbelliform, racemose 

 cymes, usually on a thickened tuberculate rachis, sessile or pedunculate. 

 Calyx small, 5-partite, with 5 glandular scales. Corolla rotate or rotate- 

 campanulate, fleshy or waxy ; lobes 5, often convex or spreading or 

 reflexed, valvate in bud. Corona-processes 5, large, fleshy-membranous 

 or horny, adnate to the staminal-column ; the lower lobe stellately 

 spreading or ascending, tm'gid or compressed, often concave on the 

 upper surface ; the upper lobe usually produced into a tooth or process 

 which is erect and incumbent on the anther. Staminal-column usually 

 short, arising from the base of the corolla ; anthers conniving over the 

 style-apex, membranous ; appendages membranous, erect or inflexed ; 

 pollen-masses 1 in each anther-cell, erect, waxy, usually flattened, often 

 thickened on the outer margin, attached by caudicles of various shapes, 

 usually short, sometimes enlarged thickened or cup-shaped, sometimes 

 long, to the horny hard pollen-carriers. Ovary of 2 distinct carpels ; 

 style-apex 5-angled, tip flattened or conical-apiculate. Fruit of 1 or 2 

 follicular mericarps, usually slender with a thin pericarp, rarely turgid 

 with a thick one. Seeds small, oblong or ovate, comose ; cotyledons 

 flattened, thick; radicle cylindi'ic. — Disteib. About 70 species, found 

 in Tropical Asia and Australia. 



Corolla reflexed, lobes longer than broad : — 



Staminal-column stipitate ; corona-processes with long nar- 

 row lobes, the upper erect, the lower horizontal with usually 

 upcurved tip (Sect. I. Cyrtoceras) .. .. ..1. H. multiflora. 



Staminal-column sessile ; corona-processes inflated : — 



Corona-processes with lower lobe ovoid, laterally com- 

 pressed ; upper lobe, smaller, rounded, erect ; corolla-tube 

 densely villous (Sect. II. Pteeostelma) . . .. 2. H. lasiantha. 



Corona-processes with lower lobe globose, hollow ; upper 

 shorter-curved ; corolla-tube with a broad annular ring 

 (coroUine corona ?) (Sect. III. Kloiophoea) . . . . 3. H. Curtisii. 



Corolla spreading, lobes spreading or incurved, rarely reflexed, 

 broader than long ; staminal-column sessile or subsessile ; 

 corona-processes with lower lobes spreading, upper acute 

 (Sect. IV. Euhoya) :— 

 Corona with lower lobes of processes obtuse : — 



Lower lobes suberect, laterally compressed ; leaf-nerves 

 horizontal : — 



Lower lobes rounded, inflated ; upper lobes acuminate ; 

 ?tems thick ; leaves thick, fleshy, over 4 in. long : — 



Flowers yellow ; corolla under 1*5 in. in diam. . . i. H. obtusifolia. 



