150 THE GENERA OF STAPEIIE^. 



B. Limb of the corolla distinctly and usually deeply 5-lobed : 



a. Stems terete, bearing distinct leaves an inch long ; 

 corolla small, rotate ; outer corona cup-shaped, the inner 

 coronal segments not produced at the apex. 1. Frerea 

 Dalz. 



b. Stems thick, covered with confluent tubercles more or 

 less arranged in numerous rows or spirals, sometimes 

 irregular, leafless, the tubercles with or without bristle- 

 tips ; corolla small, cup-shaped, or subcampanulate ; 

 outer corona of five deeply bifid or emarginate lobes, 

 connate at the base, and adnate to the back of the simple 

 inner coronal segments. 5. Trichocatjlon N. E. Br. 



c. Stems 6-12 angled, leafless, the angles tuberculate, tuber- 

 cles tipped with three bristles, the two side ones deflexed ; 

 corolla large, tubular-funnel-shaped ; outer corona cup- 

 shaped at the base, produced into ten filiform processes 

 ending in knobs ; inner coronal segments simple, ovate, 

 adnate behind to the outer corona. 7. Decabelone Dene. 



d. Stems usually 4-angled, rarely 5-6-angled, leafless, or 

 with rudimentary leaves, angles acute or obtuse, toothed 

 or tubercled, the tubercles often spine-tipped, sometimes 

 irregularly placed, rarely obsolete. 



t Corolla with a distinct campanulate tube, longer or 



shorter than the lobes. 

 x. Outer corona cup-shaped, at least at the base, the 

 segments being adnate to the sides of the inner 

 coronal segments at their base, or connate and adnate 

 to their back, the margin denticulate or produced into 

 five short or long bifid or 2-forked lobes ; inner coronal 

 segments simple or 2-horned, not longer than the 

 anthers, or produced beyond them into erect points. 

 2. Caralluma K. Br. 

 xx. Outer corona of five emarginate or bifid segments, 

 more or less connate at the base, but not adnate to 

 the sides or back of the inner coronal segments. 

 * Corolla-tube double, an inner tube with a thickened 



rim arising from near the base of the outer tube. 



10. Diplocyatha N. E. Br. 

 ** Corolla-tube simple, the base of the sinuses between 



the lobes produced into small triangular teeth ; 



outer corona sessile on, and partly adnate to, the 



base of the corolla. 9. Huerma K. Br. 

 xxx. Outer corona of five segments free to the base. 

 (See also Huernia.) 

 Corolla-lobes 2-4 times longer than broad. 2. Ca- 



raeluma B. Br. 

 Corolla-lobes not much longer than broad. 11. Sta- 



pelia Linn. 



