124 ASCLEPIADEJs. XVIII. MICROSTEMMA. XIX. LEPTADENIA. XX. ORTHANTHERA. XXI. BRACHYSTELMA. 



Native in the woods of Cossala and Gorukpur. Gomphocar- 

 pus laevigata, Ham. Microstemma, Wall. ascl. no. 23. 



Smooth Eriopetalum. PI. erect. 



Cult. For culture and propagation see Stapelia, p. U7. 



XVIII. MICROSTE'MMA (from /"icpoe, micros, small, and 

 aTiynia., stemma, a crown ; in reference to tlie smallness of the 

 stamineous corona). R. Br. in wern. soc. mem. 1. p. 25. 



LIN. SYST. Pentdndria, Digynia. Corolla rotate, 5-cleft. 

 Column of fructification exserted. Stamineous corona undi- 

 vided, fleshy, 5-lobed ; lobes alternating with the anthers ; 

 anthers simple at the apex ; pollen masses inserted by the middle, 

 lying upon the stigma. Stigma mutic. Follicles slender, 

 smooth. Seeds comose. Glabrous erect herbs, natives of New 

 Holland, with tuberous roots. Steins simple at bottom, with 

 minute leaves ; branched at top, with linear, opposite leaves. 

 Umbels lateral and terminal, almost sessile. Corollas blackish 

 purple, bearded inside. 



1 M. TUBEROSUM (R. Br. prod. p. 459.). Pj . S. Native of 

 New Holland, within the tropic. 



Tuberous-rooted Microstemma. PI. 1 foot. ? 



Cult. For culture and propagation see Ceropegia, p. 112. 



XIX. LEPTADE'NIA (from Xeirroc, leptos, slender; and 

 aSriv, aden, a gland ; in reference to the slender pollen masses. 

 R. Br. in wern. soc. 1. p. 34. 



LIN. SYST. Pentdndria, Digynia. Corolla sub-rotate, with a 

 short tube, furnished with 5 scales, one between each segment ; 

 limb bearded, valvate in aestivation. Column or gynostegium 

 nearly globose. Stamineous corona none. Anthers free, simple 

 at apex ; pollen masses erect, fixed by the base, coarctate and 

 pellucid at top. Stigma mutic, rarely apiculated. Follicles 

 smooth. Seeds comose. Twining shrubs, usually greyish from 

 powdery tomentum. Leaves flat, opposite. Umbels inter- 

 petiolar, sometimes cymose. Corpuscles of stigma minute. 

 Mr. R. Brown has examined three species of this genus, none 

 of which are yet described, one of them collected by Forskal. 



1 L. FORSKCS'LII ; flowers umbellate, y.. r> . S. Native of 

 Arabia Felix. 



Forskasl's Leptadenia. PI. tw. 



2 L. CYMOSA ; flowers cymose. 11 . . S. Native of the 

 East Indies. 



Cymose-fiowereA Leptadenia. PI. tw. 



3 L. RETICULA'TA (Wight, and Arnott, contr. ind. bot. p. 47.) 

 twining ; bark of the older branches corky, glabrous ; young 

 branches clothed with cinereous down, and sometimes with 

 tomentum ; leaves ovate or lanceolate, acute, usually smoothish, 

 and sometimes clothed with short white down ; umbels lateral, 

 many-flowered, about equal in length to the petioles ; segments 

 of corolla with revolute edges, bearded inside ; scales of throat 

 simple, short ; stigma mutic ; follicle sub-cylindrically oblong, 

 obtuse, often solitary by abortion. 



far. a ; leaves clothed with short, mealy down, but at length, 

 almost glabrous ; peduncles about equal in length to the pe- 

 tioles, and the pedicels about equal in length to the peduncles. 

 lj> Qh 8 Native of the East Indies, very abundant about 

 Negapatam, on the sea coast, where it grows to a great size. 

 Wight, cat. no. 1535. Cynanchum reticulatum, Retz. obs. 2. 

 p. 15. Willd. spec. 1. p. 1258. Rcem. et Schultes, syst. 6. p. 

 107. Cynanchum asthmaticum, Herb. Ham. no. 766. Ascle- 

 pias tuberosa, Roxb. fl. ind. 2. p. 38. Mus. ind. or. t. 614. 

 Asclepias volubilis, Herb. Madr. Ham. Wall. ascl. no. 7, ex- 

 clusive of Secatnone canescens, Smith, in Rees' cycl. 



Var. ft ; branchlets tomentose ; leaves oblong-lanceolate ; 

 peduncles very short. fy . *"*. S. Native of the Peninsula of 



India, in the southern provinces. Leptadenia brevipes, Wight, 

 cat. no. 1536. 



Far. y ; leaves broad-obtuse, retuse at the base, rather vel- 

 vety beneath. Ij . / "\ S. Native of Ava, near Pegu. Gym- 

 nema aurantiaca, Wall. ascl. no. 147. 



Reticulated Leptadenia. Shrub tw. 



4 L. IMBE'RBIS (Wight, 1. c. p. 48.) twining, glabrous ; leaves 

 broadly ovate or cordate, acuminated ; umbels lateral, many- 

 flowered, about equal in length to the petioles ; segments of 

 corolla revolute on the edges, beardless ; scales of throat 

 simple ; stigma apiculated. T? . ^. S. Native of the East 

 Indies, at Meerut and Suroy. Wall. ascl. no. 77. e, unnamed. 

 The only certain character which distinguishes this from the 

 varieties of the last, are the beardless segments of the corolla. 



Beardless Leptadenia. Shrub tw. 



5 L. SPA'RTIUM (Wight. 1. c.) suffruticose, glabrous ; stems 

 slender, much branched ; leaves narrow-linear, tapering at the 

 apex ; umbels almost sessile ; segments of corolla beardless 

 inside, with revolute margins ; scales of throat broad, exserted ; 

 stigma mutic. >j . ^\ S. Native of the East Indies, on the banks 

 of the river Yavanna, Hamilton : Himalaiah, Royle : Simla, 

 Countess of Dalhousie. Gymnema spartium, Wall. ascl. no. 

 76. Cannychum angustifolium, Ham. herb. 



Broom-like Leptadenia. Shrub tw. 



6 L. ? ELLIPTICA (Blum, bijdr. p. 1066.) leaves oval, acutish, 

 hardly emarginate at the base, coriaceous, glabrous, veinless 

 above, paler beneath, and full of fine parallel veins ; cymes 

 panicled, interpetiolar, clothed with rust-coloured scurf. J? . /r \ 

 S. Native of Java and Nusse Kambanga, in woods. Flowers 

 small, sweet-scented. Stamineous crown small, 5-angled, girded 

 at the base by a fleshy, 5-lobed urceolus. Follicles smooth or 

 lepidoted. Seeds comose. This plant differs, in having a sta- 

 mineous crown, from the other species of Leptadenia. 



Elliptic-leaved Leptadenia. Fl. year. Shrub tw. 



Cult. For culture and propagation see Ceropegia, p. 112. 



XX. ORTHANTHE'RA (from op$o , orthos, erect; and 

 avSqpa, ant/iera, an anther ; anthers erect.) Wight, contrib. 

 ind. bot. p. 48. 



LIN. SYST, Pentdndria, Digynia. Corolla urceolate, 5-cleft ; 

 throat naked ; tube rather ventricose ; aestivation valvate. 

 Staminal corona none: Anthers simple at top, erect, acute ; 

 pollen masses erect, fixed by the base, coarctate and pellucid 

 at apex. Stigma apiculate. A leafless shrub. Umbels on short 

 peduncles, few-flowered. Calyx 5-parted ; segments subulate 

 at top. Corolla villous outside, glabrous inside, twice as long as 

 the gynostegium. Filaments furnished with a gland, or fleshy 

 leaflet, at the base of each, as in Gymnodenia. Anthers free, lying 

 upon the stigma, which is apiculated. Follicles unknown. This 

 genus is perhaps closely allied to Leptadenia, from which it only 

 differs, by the urceolate corolla, the absence of scales to the 

 orifice of the tube, and erect anthers. The habit is also dif- 

 ferent. 



1 O. VIMINEA (Wight, 1. c.) J? . S. Native of Hindostan, at 

 Doab. Apocineae viminea, Wall. cat. no. 7478. 



Twiggy Orthanthera. Shrub. 



Cult. See Ceropegia, p. 112, for culture and propagation. 



XXI. BRACHYSTE'LMA (from /3pa X v, brachys, short; 

 and orfX^a, stelma, a crown ; corona short.) R. Br. in bot. 

 mag. 2343. bot. reg. 722. 



LIN. SYST. Pentdndria, Digynia. Corolla campanulate (f. 

 16. b.~), having the sinuses angular. Column or gynostegium 

 inclosed. Corona simple, 5-cleft ; lobes opposite the anthers, 

 simple on the back. Anthers naked at top. Pollen masses 



