336 ASCLEPIADEZ. 
opposite the lobes of the corolla, of which there are only slight traces in the latter—also — 
in the gynostegium being quite free from the corona. 
18. POLYSTEMMA. 
Polystemma, Dene. in DC. Prodr. viii. p. 602; Benth. et Hook. Gen. Plant. ii. p. 768. 
A twining shrubby monotype. 
4 Polystemma viridiflora, Dene. in DC. Prodr. viii. p. 602; Deless. Ic. Sel. v. 
t. 79. 
Soutn Mexico, country east of Orizaba, 4000 feet (Galeotti, 1517), Mirador (Linden, 
338), between Tehuantepec and the sea (Andrieux, 456). Hb. Kew. 
19. FIMBRISTEMMA. 
Fimbristemma, Turcz. in Bull. Soc. Nat. Mosc. 1852, ii. p. 8320; Benth. et Hook. Gen. Plant. ii. 
p- 768. 
Climbing shrubs—one species inhabiting Guatemala, and another Venezuela. 
1. Fimbristemma warscewiczii, Benth. et Hook. Gen. Plant. ii. p. 768. 
Calleolepium warscewiczii, Karst. Fl. Columb. ii. t. 165. 
GuATEMALA and Costa Rica (Warscewicz). 
20. NEPHRADENIA. 
Nephradenia, Dene. in DC. Prodr. viii. p. 604; Benth. et Hook. Gen. Plant. ii. p. 771. 
Six herbaceous species, whereof five are Brazilian. 
1. Nephradenia neriifolia, Benth. et Hook. Gen. Plant. ii. p. 771. 
Blepharodon neriifolium, Dene. in DC. Prodr. viii. p. 604. 
Acerates gomphocarpoides, Benth. Pl. Hartw. p. 66, non Dene. 
Sourn Mexico, Totontepec (Hartweg), eastern Cordillera of Oaxaca, 2000 feet 
(Galeotti, 1535), Sierra San Pedro Nolasco, &c. (Jurgensen, 714). Hb. Kew. 
21. MARSDENTA. 
Marsdenia, R. Br. in Mem. Wern. Soc. i. p. 28; Benth. et Hook. Gen. Plant. ii. p. 772. 
About sixty shrubby species, mostly twiners, widely dispersed in hot countries of 
both hemispheres, and one inhabiting the Mediterranean region. 
1. Marsdenia clausa, R. Br. in Mem. Wern. Soc. i. p. 30; DC. Prodr. viii. 
p. 615; Griseb. Fl. Brit. W. Ind. p. 422. 
Marsdenia obovata, Turcz. in Bull. Soc. Nat. Mosc. 1852, ii. p. 321. 
MEXICO, specimen ex hb. Pavon.—West Inpies. Hb. Kew. 
2. Marsdenia coulteri, Hemsley, n. sp. 
Hirsuta, ramulis brevissimis, foliis parvis ovatis utrinque hirsutis, umbellis paucifloris, floribus parvis, 
coroll fauce barbata, corone squamis minutis, stigmate rostrato. 
