338 ASCLEPIADEZ. 
7. Marsdenia zimapanica, Hemsley, n. sp. 
Gracilis, ramulis brevibus, foliis subtus hirsutis, umbellis paucifloris breviter pedunculatis, corolle 
fauce imberbi, coronz squamis antheras excedentibus, stigmate convexo. . 
Frutex scandens?, ramulis brevibus, gracilibus, teretibus, glabrescentibus. Folia longiuscule 
petiolata, tenuia, supra cito glabrescentia, subtus pubescentia, lanceolato-oblonga, ovata vel 
ovato-orbicularia, acuminata, obtusa vel subacuta, basi rotundata vel plus minus cuneata ; ; 
petiolus gracilis, 6-9 lineas longus. Flores 4-5 lineas diametro, umbellati ; umbellze pauci- 
flor, pedunculis pedicellisque 2-3 lineas longis ; calyx hispidulo-hirsutus, segmentis ovato- 
oblongis, obtusissimis, corolle tubum equantibus; corolla hypocraterimorpha, intus extusque 
glabra, lobis ovato-oblongis, obtusissimis, patentissimis, minute ciliolatis ; corone squamz 
anguste, apice rotundate vel fere truncate, antheras excedentes; ovaria glabra, stigmate 
convexo. Folliculi non visi. 
Sout Mexico, Zimapan (Coulter, 964). Hb. Kew. 
[Stapelia bufonia, Jacq., a South-African plant, has become established i in cultivated 
ground near San Luis Potosi. | | 
Order LXXXIX. LOGANIACEA. 
Loganiacee, Benth. et Hook. Gen. Plant. ii. p. 786. 
Herbs, shrubs, or trees, various in habit. Thirty genera, embracing about 350 
species, widely dispersed in the tropics; a few in extratropical America and Australia, 
and in South Africa. The Order is not represented in Europe and Asiatic Russia. 
1. GELSEMIUM. 
Gelsemium, Juss. Gen. Plant. p. 150; Benth. et Hook. Gen. Plant. ii. p. 789. 
Twining shrubs. Three species—one North-American, one Chinese, .and one 
Sumatran. 
1. Gelsemium sempervirens, Ait. Hort. Kew. ed. 2, ii. p. 64; A. Gr. Synop. | 
Fl. N. Am. ii. p. 107. | 
Gelsemium lucidum, Michx. Fl. Bor.-Am. i. p. 120. 
Jasminum luteum etc., Catesby, Carol. i. t. 53. 
Vireinia to Frorrpa and Trxas.—Mexico, Orizaba (Botteri, 934), Sierra San Pedro 
Nolasco &c. (Jurgensen, 835), pine forests, Titotolé, Chiapas (Linden, 1658). Hb. Kew. 
2. PLOCOSPERMA. 
Plocosperma, Benth. in Benth. et Hook. Gen. Plant. ii. p. 789. 
A remarkable shrubby monotype. 
1. Plocosperma buxifolium, Benth. in Hook. Ic. Pl. t. 11 95. 
GUATEMALA, without locality (Skinner). Hb. Kew. 
