110 
long, with axillary wool: radial spines 12 to 14, setaceous, 7 to 9 mm. 
long, bulbous at base, straight or curved, white; central spine straight, 
subulate, somewhat shorter, but scarcely stouter: flowers yellow, 3.5 
to dem. long: fruit unknown.—Type unknown. 
Sandy ridges in the valley of the Rio Grande (both sides of the river), 
from the mouth to Eagle Pass. Fl. from March throughout the season, 
Specimens examined: TEXAS (Schott of 1852): also specimens culti- 
vated in St. Louis in 1845 and 1861. 
Dietrich’s description was taken from plants collected by Poselger at Corpus 
Christi. The Schott specimens are from Eagle Pass. Dr. Engelmann calls attention 
to the fact that this species approaches CoRYPHANTHA in its exserted ovary and 
large flower, but the flowers are clearly from the growth of the preceding season. 
The species is said to be too near the Mexican C. longimamma of central and south- 
ern Mexico, but in the absence of type specimens of vither the question can not be 
settled. The usual characterization of C. longimamma is as follows, which seems to 
make it distinct enough: 
36. Cactus longimamma (DC.) Kuntze, Rev. Gen. PI. 260 (1891). 
Mamillaria longimamma DC. Rev. Cact. 113 (1829). 
Ovate or at length cylindrical, simple or cespitose: tubercles oblon g- 
ovate, large at base, 4 to 5 em. 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 em. long, becoming 6 
em. broad when fully expanded, yellow. (Ill. DO, Mem. Gaet. 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 Eugelm. Pl, Fendl. 49 (1849). 
Mamillaria notesteinii Britton, Bull. Torr. Bot. Club, xviii, 867 (1891), 
Globose, 3.5 cm. in diameter, simple or nearly so: tubercles ovate- 
eylindrical, 12 to 14 mm. long, slightly grooved: radial spines 13 to 17, 
straight, whitish, setaceous, somewhat unequal, 8 to 10 mim. long; ecen- 
tral spine more robust, straight and porrect, puberulent, 10 to 12 mm. 
long, often wanting: flowers about 2.5 em. 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. 
