748 Asclepiadaceae. 
of the corolla, nearly as long as the corolla-lobes, clavate, the 
filament portion slender and longer than the corona; anthers oblong, 
tipped with a membranous appendage, which is inflexed over the 
style-apex. Pollen-masses pendulous, attached in pairs to the pollen- 
carriers by flexuous caudicles. Style not produced beyond the anther- 
tips, slightly convex at the apex. Follicles stout, ovoid-lanceolate, 
beaked, smooth. Seeds turgid, crowned with a tuft of hairs. — 
An erect plant, with woody stems, opposite leaves, and sublateral 
cymes of moderate sized flowers. 
Species 1, extending through Egypt into Arabia. It is very closely 
allied to Cynanchum, and should perhaps, be united with that genus; the 
chief difference being that the lobes of the corona are placed opposite to the 
corolla-lobes, and the filament part of the staminal-column is long, slender 
and exserted from the corona. 
1050. Solenostemma Argel (Del.) Hayne Arzneygew. IX (1853), 
tab. 38. — Boiss. Flor. Or. IV, p. 56. — DC. Prodrom. VII, p- 533. 
— Aschers. Schweinf. Ill. Flor. d’Eg., p. 104 no. 680. — Cynanchum 
Avdel Delile Illustr. Flor. d’Eg., p. 319 tab. 20 fig. 2, — Cynan- 
chum oleaefolium Nectoux, Voy. Kgypte, p. 20 tab. 3. -— Argelia 
Delilei Decsne. in Ann. Sc. Nat. 2 sér. IX., p. 331 tab. 11 fig. E. 
Stems herbaceous, erect, 35—60 cm high, branching, very minutely 
downy, leafy. Leaves longer than the internodes, ascending; petiole 
2—5 mm long; blade 2—21/, em long, 5—8 mm broad, thick and 
rigidly coriaceous when dry, probably fleshy when alive, varying from 
lanceolate to oblong-ovate, acute or subacute, cuneate at the base, 
minutely downy on both sides; midrib flat above, prominent beneath; 
veins indistinct. Cymes axillary, 21/,—5 cm long (including the 
5—10 mm long peduncles), 21/,—5 cm in diam., densely many- 
flowered, minutely downy; bracts 5—6 mm long, 1—2 mm broad, 
linear-lanceolate, acute; pedicels 5—6 mm long. Sepals 5 mm_ 
long, 1 mm broad, oblong, acute, minutely downy. Corolla-tube 
2mm long; lobes 51/,—6 mm long, 1 mm broad, narrowly oblong, 
obtuse, spreading, white, glabrous or with a few scattered hairs on 
the back. Corona ‘Is, as long as the corolla-lobes, submembranous, 
cup-shaped, obtusely 5-lobed ‘to half- -way down, and infolded at the 
sinuses between the lobes, which are deeply concave-hooded, from 
their margins being inflexed so as to meet or nearly so.  Staminal- 
column 5—51/, mm long, clavate, the part formed by the filaments 
very slender, as long as the anthers and exceeding the corona. 
Follicles solitary 5 em long, 171/,—18 mm thick, ovoid-lanceolate, 
acuminate. Seeds turgid, ovoid, channelled down one face, minutely 
tuberculate, crowned with white hairs. Flow. January to April. 
