1012 LXXX. ASCLEPIADEiE. 



15. HOYA, R. Br. 

 (After Thomas Hoy.) 



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

 Corona of 5 rather thick fleshy segments attached to the gynostegium, 

 horizontally spreading or expanded into variously-shaped disks. Anthers 

 terminated 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 interpetiolar simple umbels. 



The genus is widely spread over tropical Asia, and more sparingly represented in Africa on 

 the one hand, and the South Pacific Islands on the other. 



Flowers white. 

 Leaves oblong, pubescent beneath. Corona-segments expanding into 

 concave ovate horizontally spreading laminse, with points at base. 



Keels almost winged 1. H.Sana, 



Plant softly pubescent. Leaves ovate-cordate. Flowers like H. australis 2. H. Keysii. 

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



the outer margin very obtuse, the inner acuminate . . 3. H. australit. 



Flowers yellow. Corona-segments expanded into slightly concave ovate . , i^ 



almost acute disks, the inner margin very short and obtuse 4. H. Nicholsonice, ^ 



1. H. Sana (after Mrs. F. L. Jardine), Bail. Ql. Agri. Journ. i. A slender 

 climber, .on open country found climbing over shrubs to the height of 6 or 

 more feet. Leaves oblong to oblong-lanceolate, from 1^ to 3Jin. long, thick, 

 pale in colour, only showing a rather broad midrib, more or less covered on 

 the under side with white hairs, often apiculate, petioles seldom exceeding ^in. 

 Peduncles hairy, about 10 lines long, bearing an umbel of about 10 or 12 more 

 or less pubescent, white flowers. Pedicels hairy, 9 lines long. Calyx-lobes 5, 

 hairy, rather narrow. Corolla spreading to about 5 lines diameter ; lobes 5, 

 hairy on the back, the hairs much shorter on the face. Corona- segments expanding 

 into concave, ovate, horizontally spreading laminsB, the base ending in a rather 

 long point ; the 2 keels almost wing-like. 



Hab.: Polo Creek, Somerset, Mrs. F. L. Jardine. 



There does not seem sufficient authority for giving H. carnosa, K. Br., as a Queensland 

 species. The specimen in Mueller's herbarium, referred to by Benth. Fl. Austr. iv. 346, must, in 

 my opinion, have been placed there in mistake; or, it might have belonged to H Sana, which 

 in a dry state somewhat resembles H. carnosa. 



2. H. Keysii (after J. Keys, F.L.S.), Bail. Proc. Roy. Soc. Ql. i. A succulent 

 pubescent climber. Leaves ovate-cordate when small, the larger ones more 

 ovate, 1 to 2in. long, f to over lin. wide, thick, fleshy, but prominently penni- 

 nerved, the principal veins conspicuously anastomosing within the margin. 

 Inflorescence pubescent. Peduncles 6 to 9 lines long, bearing an umbel of 

 12 or more flowers, on pedicels of 6 to 9 lines. Calyx- segments about 1 line 

 long. Corolla spreading to about fin. wide, the segments acuminate, inflexed 

 after flowering. Corona-segments with horizontally spreading lamina, very 

 obtuse on the outer margin, the inner margin acuminate and the back with 2 

 sharp keels as in H. australis. 



Hab.: On rooks, Mount Perry, Jas. Keys ; Lizard Island, Lard Lamington. 



3. H. australis (Australian), R. Br.; Traill in Trans. Hort. Soc. vii. 28 ; 

 BentJi. Fl, Austr. iv. 846. A succulent glabrous twiner or epiphyte. Leaves 

 on short petioles, ovate obovate or nearly orbicular, obtuse or shortly acuminate, 

 rounded or rarely almost cordate at the base, thick and fleshy, 2 to Sin. long or 

 rarely more. Flowers white tinged with pink in the centre, in simple umbels 

 on interpetiolar peduncles rarely exceeding the petioles, the pedicels slender, 

 ^ to lin. long or even more. Calyx -segments about 1 line long. Corolla 



