stout, with dusky apex, 12 to 15 mm. long, twice or thrice as
long as the whitish setaceous upper ones; central spine
(sometimes two) shorter (about 4 mm.), stout, dusky and porrect:
flowers 3 cm. long, reddish-white, brownish-red outside: fruit
unknown. (Ill. Cact. Mex. Bound. t. 9. figs. 18-20) Type
probably lost, as no specimens could be found in the Engelmann
Herbarium.

Chihuahua, near Cosihuiriachi.

So far as can be discovered, this species has not been collected
since the original Wislizenus collection of 1846-47. The plants
were cultivated by Dr. Engelmann and made to bloom, showing the
flowers to be larger and darker colored than in the rest of the
group, from which the species also differs in its more robust
habit, its very unequal radial spines, and the occasional
occurrence of two centrals.

** Central spine hooked.

9.Cactus uncinatus (Zucc) Kuntze, Rev. Gen. Pl. 261 (1591).

Mamillaria uncinata Zucc. in Pfeiff. Enum. 34 (1837).
Mamillaria bihamata Pfeiff. in Otto and Deitr. Gart. vi. 274 (1840)
Mamillaria adunca Scheidw. (1845-1849?).
Mamillaria depressa Scheidw. (1845-1849?).

Usually globose (occasionally depressed or even subcolumnar), 5
to 6 cm. in diameter (doubtless becoming larger): tubercles 8
to 10 mm. long, woolly in the upper axils: radial spines 4 to