Mamillaria longimamma DC. Rev. Cact. 113 (1829).
Ovate or at length cylindrical, simple or cespitose: tubercles
oblong-ovate, large at base, 4 to 5 cm. long: radial spines 7 or
8, radiant and equal, 8 to 10 mm. long or more, more or less
pubescent; central spines 1 to 3, somewhat longer and spreading:
flower 4 cm. long, becoming 6 cm. broad when fully expanded,
yellow. (Ill. DC. Mem. Cact. t. 5.)
II. CORYPHANTHA. Flowers from the base of a groove on young or
nascent tubercles (hence appearing terminal), mostly large:
spines never hooked (except in the doubtful C. brunneus).
* Flowers yellow.
+ The originally central flowers pushed aside by the continuous
development of new tubercles: usually a single prominent
central spine.
37. Cactus missouriensis (Sweet) Kuntze, Rev. Gen. Pl. 259
(1891).
Cactus mamillaris Nutt. Gen. i. 295 (1818), not Linn. (1753).
Mamillaria missouriensis Sweet, Hort. Brit. 171 (1827).
Mamillaria simplex Torr. & Gray, Fl. N. Am. i. 553 (1840).
Mamillaria nuttallii Engelm. Pl. Fendl. 49 (1849).
Mamillaria notesteinii Britton, Bull. Torr. Bot. Club, xviii,
367 (1891).
Globose, 3.5 cm. in diameter, simple or nearly so: tubercles
ovate-cylindrical, 12 to 14 mm. long, slightly grooved: radial
spines 13 to 17, straight, whitish, setaceous, somewhat unequal,
8 to 10 mm. long; central spine more robust, straight and
porrect, puberulent, 10 to 12 mm. long, often wanting: flowers
about 2.5 cm. long, yellow or reddish: stigmas 2 to 5: fruit
globose, scarlet, 6 to 8 mm. in diameter: seeds globose, black
and pitted, 0.8 to 1.1 mm. in diameter. (Ill. Cact. Mex. Bound.
t. 74., f. 6, seeds.) Type unknown.
High prairies of the Upper Missouri, from Montana to South Dakota
and southward through western Nebraska to western Kansas and the
eastern slopes of the mountains of Colorado. Fl. May.
Specimens examined: Montana (Notestein of 1893): National Park
(Tweedy 423): South Dakota, (collector unknown, in 1847, 1848,
1853): Nebraska (Hayden of 1855).