316 ' LXXVr. ASCLEPIADE^. 



12. HOYA, R. Br. 



♦ ► ■ « ■ -^ 



Corolla rotate^ the lobes flat or with reflexed margins, valvate in the bud. 

 Corona of 5 rutlier tliick fleshy segments attached to the gynostegiuai, Iiori- 

 zontally spreading or expanded into variously-shaped disks. Anthers termi- 

 nated by a membrane ; pollen-masses 2 to each anther, erect. Stigma obtuse 

 or scarcely prominent. — Stems twining or trailing. Leaves thick and fleshy 

 or in a few species not Australian membranous. Flowers often fleshy or 

 waxy, in pedunculate hiterpetiolar simple umbels. 



The genus is widely spread over tropical Asia, and more sparuij^ly represented in Africa oq 

 the one hand, and the South Pacific Islands on the other. Of the three Australian specie?, 

 one extends over the Indian Archipelago to South China, another is in the islands of the 

 South Pacific, the third may be endemic, although closely allied to a Pacific Island ot^p. 



Flowers white or piuk. Corona-segments very convex, and spread- 

 ing into a horizontal star 1. ZT. carnosa. 



Flowers white or pink. Corona-segments expanded into a concave 



disk, the outer margin very obtuse, the inner acuminate .... 2. H". austrahs. 



Flowers yellow. Corona-segments expanded into slightly concave 



ovate almost acute disks, the inin^r margin very short and obtuse . 3. H. Nicholsonia. 



I, H. carnosa^ li. Br. (as to tlic Linnean plant) ; Bene, in DO. Prod. 

 Tin. 636. A succulent glabrous twiner. Leaves from broadly ovate-cordate 

 to ovate-oblong, obtuse or shortly acuminate, thick and fleshy, 2 to 3 m. 

 long, on short petioles. Flowers white, mixed with piuk in the centre, 

 succulent, in rather large simple umbels on short interpetiolar peduncles, 

 the pedicels | to 1| in. long, pubescent. - Corolla spreading to fully 3 m- 

 diameter, broadly 5-lobed, densely papillose on the upper side, the luargms 



tcuire. ^orona-sep:ments iorming the horizontal rays of the star, aiteim.uu^ 

 with the corolla-lobes, ovate-Ianceohite, convex, shining above (^^n^^W^^J^ 

 diymg), the margins x^xoM^^—AsdepiaH carnosa, Linn. ; Bot. Mag. t- 7SS, 

 Sm. Exot. Bot. li. t. 70. 



-N TV.O cnP^iVs IS also in Soutt 



Muelli 



-— «», „..« i.iuuaui^ iLi lue inman Arenipelago. Th 

 terred to tins species bj Brown, is the following one. 



2. H. australis^ R, Br, ; Traill in Trans. IIorL Soc. vii. 28. A succu- 

 lent glabrous twiner or epiphyte. Leaves on short petioles, ovate obovaie 



■nliite tinged with pink in 



white tinged with pink in the centre, in simple umbels ou interpetiolar pe 

 duncles rarely exceeding the petioles, the pedicels slender, \ to 1 in. \on^' 

 even more Calyx-segments about 1 line long. Corolla spreading to a » • 

 diameter, broadly 5-lobed, the upper surface nearly smooth and glabrous ex- 

 cept towards the edges which are slightly papillose and not reflexed. Coron 

 segments expanded into concave (at first almost cnp-shaped) ^^^mo^^^- 



prominently 2-keeled.— i7. 



Prod. 460 (as to the Australian plant)- //. i/caW.a^a,' A. Gray in Froj 

 A^ner. Acad. Sc. v. 335; 77. BalrympUana, F. Maell. Kep. Burdek. Exped 



