130 



ASCLEPIADE^E. XXVI. TYLOPHORA. XXVII. BELOSTEMMA. XXVIII. MARSDENIA. 



Cissus-like Tylophora. Fl. year. PI. tw. 



18 T. TE'NUIS (Blum, bijdr. p. 1062.) corollas glabrous; 

 panicles axillary ; pedicels subumbellate ; leaves lanceolate, 

 acuminated, sometimes cordate at the base, 3-nerved, glabrous ; 

 follicles very acute. Jj. ^. S. Native on the west coast of 

 Java, at the bottom of mountains. 



Slender Tylophora. Fl. year. PI. tw. 



19 T. RUPE'STRIS (Blum, bijdr. p. 1062.) leaves ovate- 

 cordate, acuminated, quintuple-nerved, glabrous; follicles blunt- 

 ish. ^2 . / '\ S. Native of Java, among the Parang mountains, 

 on rocks. Nearly allied to T. tennis. 



Rock Tylophora. PI. tw. 



3. Leaflets of stamineous corona rather membranous, finely 

 acuminated, acute, without any cusp or point inside, longer than 

 the gynostegium. 



20 T. TENE'RRIMA (Wight, contrib. ind. hot. p. 50.) twining, 

 slender, smoothish ; leaves narrow-lanceolate, attenuated at the 

 apex ; peduncles filiform, much longer than the leaves, bearing 

 distant, 2-3-flowered fascicles ; corolla deeply 5-cleft ; leaflets 

 of corona exceeding the gynostegium, ovate, finely acuminated 

 at the apex ; pollen masses transverse ; stigma obtuse, f; . 

 <> \ S. Native of Nipaul, at Purpuhna ; and the Himalaiah. 

 Homolostyles tenerrima, Wall, ascl no. 96. 118. Leaves 1-2 

 inches long and 1-4 lines broad. 



Very tender Tylophora. Shrub tw. 



4. Leaflets of corona depressed, fleshy, clasping the base of 

 the gynostegium, each drawn out into a cusp -formed, erect toothlet 

 at the apex, inside. 



21 T. CAPFARIDIFOLIA (Wight and Arnott, contrib. ind. hot. 

 p. 51.) twining, glabrous; branches slender; leaves elliptic- 

 oblong, mucronately acuminated, coriaceous, reticulately veined ; 

 racemes umbel-formed, almost sessile, few-flowered ; flowers 

 small ; segments of corolla obtuse, glabrous ; leaflets of corona 

 roundish, fleshy, furnished on the inside at the apex with a 

 short, acute toothlet. tj . r *. S. Native of Mysore. Wight, 

 cat. no. 1542. Asclepias tenuis, Heyne, herb. Wall. ascl. 

 no. 122. Leaves 1 to 2 inches long, and 5-7 lines broad. 



Capparis-leaved Tylophora. Shrub tw. 



22 T. PURPU'REA (Wall. ascl. no. 50. ex Wight and Arnott, 

 contrib. ind. bot. p. 51.) twining, glabrous ; branches slender; 

 leaves subcordate-oblong, mucronately acuminated ; peduncles 

 filiform, about equal in length to the leaves, bearing each 2-3 

 small fascicles of flowers ; segments of corolla acute ; leaflets 

 of corona roundish, clasping the base of the gynostegium, fur- 

 nished with a short toothlet inside at the apex ; pollen masses 

 transverse ; stigma obtuse. I? . r \ S. Native on the banks of 

 the Irrawaddi. 



Purple Tylophora. Shrub tw. 



23 T. ASTHMA'TICA (Wight and Arnott, contrib. ind. bot. p. 

 51.) twining, downy ; branches slender; leaves ovate-roundish, 

 acuminated, usually cordate at the base, glabrous above, downy 

 beneath; peduncles shorter than the leaves, bearing each 2-3 

 sessile, few-flowered umbels towards the apex ; flowers rather 

 large, on long pedicels, purplish ; segments of corolla acute ; 

 leaflets of corona fleshy, depressed, clasping the base of the 

 gynostegium, furnished with an erect, elongated tooth inside 

 at the apex ; pollen masses transverse, minute ; stigma obtuse ; 

 follicles glabrous, divaricate. Tj . / '\ S. Native of the East 

 Indies. Asclepias asthmatica, Roxb. fl. ind. 2. p. 33. Willd. 

 spec. p. 1270. Asclepias tunicata, Wall. ascl. no. 117. Ascl. 

 vomitoria, Kcenig. in herb. Banks. Roxb. mus. ind. or. t. 608. 

 Cynanchum ipecacuanha, Willd. spec. 1. p. 1270. Cynan- 

 chum vomitorium, Lam. diet. 2. p. 235. Cynanchum viridi- 

 florum, Sims, bot. mag. t. 1929. Spreng. syst. 1. p. 852. 



12 



Hoya planiflora, Wall. ascl. no. 1 1 7. b. V. Tylophora pubescens, 

 Wall. ascl. no. 117. a., also Wall. ascl. nos. 119. 121. 148. 

 unnamed. Pluk. t. 336. f. 7. This plant is said to have been 

 figured as Hoya viridiflora in some foreign work. The roots 

 are used on the coast of Coromandel as a substitute for Ipeca- 

 cuanha. 



Var. a, pubescens (Wight, 1. c.) downy in every part, except 

 the upper surfaces of the leaves. 



Var. ft, glabra (Wight, 1. c.) glabrous in every part. 



Asthmatic Tylophora. Shrub tw. 



24 T. TOMENTOSA ; twining, tomentose ; leaves cordate, 

 ovate, mucronate, white from tomentum beneath ; umbels about 

 5-flowered. ^ . ^\ S. Native of the East Indies. Cynan- 

 chum toment6sum, Lam. diet. 1. p. 235. Perhaps belonging 

 to the present section. 



Tomentose Tylophora. Shrub tw. 



Cult. For culture and propagation see ffoya, p. 128. 



XXVII. BELOSTE'MMA (from fteXog, bclos, an arrow, 

 and trnpfia, stcmma, a crown). Wall. mss. ascl. no. 153. 

 Wight and Arnott, contrib. ind. bot. p. 52. 



LIN. SYST. Pent&ndria, Digynia. Corolla rotate. Stamineous 

 corona 5-leaved ; leaflets linear-oblong, fleshy, fixed vertically to 

 the middle of the gynostegium, averse, spreading. Anthers ter- 

 minated by a membrane ; pollen masses globose, rather ascending, 

 or placed transversely under the dilated margin of the stigma ; 

 stigma mutic. Twining, loosely downy shrubs. Leaves oppo- 

 site, cordate, ovate, somewhat acuminated. Peduncles shorter 

 than the leaves. Umbels simple, few-flowered. Flowers small. 

 This genus differs only from Tylophora in the form of the 

 corona ; in that the leaflets are close pressed on the gynoste- 

 gium ; in this they appear as if attached by the one end, and 

 stand at right angles with the gynostegium, and transversely 

 across the corolla. 



1 B. HIRSU'TUM (Wall. 1. c.). J? . ^. S. Native of Nipaul. 



Hairy Belostemma. Shrub tw. 



Cult. For culture and propagation see Hoya, p. 128. 



XXVIII. MARSDE'NIA (named in honour of William 

 Marsden, F.R.S. late Secretary to the Admiralty, and author of 

 a " History of Sumatra," in which, though it is evident that he 

 has not made botany his particular study, he has had the merit 

 of turning the attention of botanists to several valuable plants, 

 among others to the camphor tree of Sumatra (Dryobalanops 

 camphora), and to a species of this genus, the Marsdenia tinc- 

 tbria, said to afford the best indigo in that island). R. Br. in 

 mem. wern. soc. 1. p. 28. prod. p. 460. Pergularia species, 

 Spreng. syst. 1. pp. 843, 844. 



LIN. SYST. Pent&ndria, Digynia. Corolla urceolate, 5- 

 cleft, sometimes rotate. Stamineous corona 5-leaved ; leaflets 

 compressed, undivided, toothless inside. Anthers terminated 

 by a membrane. Pollen masses erect, fixed by the base. 

 Follicles smooth. Seeds comose. Usually twining shrubs. 

 Leaves opposite, broaclish, flat. Cymes interpetiolar, sometimes 

 thyrsoid. Stigma usually mutic, but sometimes beaked ; beak 

 undivided or bifid. Plants natives of New Holland, East 

 Indies ; very few in South America and Syria. This genus 

 differs from Pergularia chiefly in the want of the inner laciniae 

 to the corona ; it is therefore an arbitrary separation, and made 

 principally to obtain clearer characters for both. The two 

 species with an elongated stigma are perhaps not truly of the 

 genus, but if separated from it must form each a distinct genus. 

 R. Br. 



SECT. I. MARSDE'NLK VE'R*. Stigma mutic, or apiculated. 



$ 1. Throat of corolla naked. 

 1 M. VELUTINA (R. Br. in wern. soc. mem. 1. p. 29. prod. 



