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150 THE GENEEA 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. Fkerea
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 bristletips
; 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. Trichocaulon N. E. Br.
c. Stems 6-12 angled, leafless, the angles tuberculate, tubercles
tipped with three bristles, the two side ones deflexed
corolla large, ti;bular-funnel- shaped ; outer corona cupshaped
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.
f 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 E. 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. Huernia E. Br.
XXX. Outer corona of five segments free to the base.
(See also Huernia.)
Corolla-lobes 2-4 times longer than broad. 2. Caralluma
E. Br.
Corolla-lobes not much longer than broad. 11. Sta-
PELiA Linn.