103 
seeds minute, dark brown and lightly pitted. (IU. Cact. Mex. Bound. 
t. 6. figs. 9-12)—Type, Wislizenus of 1846 in Herb. Mo. Bot. Gard. 
Central Chihuahua, Fl. May, in cultivation. 
Specimens examined: CHInuAHUA (Wislizenus of 1846, 1850): also 
specinens cultivated in Baumann’s Garden in 1857, 1858; also growing 
in Mo. Bot. Gard. 1893, 
Dr. Engelmann observed a curious intermediate character in the origin of the 
flowers of this species, the first ones of the season appearing in the axils of the last 
tubercles of the preceding year, while the later ones develop from the axils of the 
first tubercles of the same season. ‘The specimen growing in Mo, Bot. Gard. in 1893 
had 3 central spines, one or two being hooked. 
19. Cactus grahami (Mngelm.) Kuntze, Rev. Gen. Pl. 260 (1891). 
Mamillaria grahami Engelm. Syn. Cact. 262 (1856). 
Globose or at length ovate, 2.5 to 7.5 em. high, simple or branched 
from the base and even cespitose: tubercles ovate, 6 mm. long, dilated 
at base (corky and persistent when old), with naked axils: radial spines 
15 to 30 in a single series, white, often dusky-tipped, slender but rigid, 
naked or puberulent, 6 to 12 mm. long, the shorter ones uppermost, the 
longer ones lateral; central spines 1 to 3, blackish from a paler base, 
the lower (often the only) one stouter and longer (6 to 18 mm.), hooked 
upward, the one or two upper ones (when present) shorter and slenderer, 
divergent: flowers 2 to 2.5 em. long, rose-colored: fruit 2 to 2.5 em. 
long: seeds 0.5 to 1mm, long, black and pitted. (ZU. Cact. Mex. Bound. 
t. 6. figs, 1-8)—Type, Wright of 1852 and Bigelow of 1852 in Herb. Mo. 
Bot. Gard, 
In rocky places, from the mountains of extreme southwestern Texas 
(west of the Pecos) to southern Utah, southern Califorinia (common 
along the Colorado), and Sonora, Fl. June-August. 
Specimens examined: TEXAS ( Wright of 1852; Newberry of 1858; G. 
RK. Vasey of 1881; Miller of 1881; Briggs of 1892): New Mrxico 
(Evans of 1891): ARIZONA (Bigelow of 1852; Schott of 1858; Cous of 
1865; Palmer of 1869, 1870; Engelmann of 1880; Pringle of 1884): 
Uvan (Parry of 1874): SONORA (Schott of 1853): also specimens culti- 
vated in the Mo. Bot. Gard. in 1881. 
In all references to the fruit of this species it is described as “oval and green,” 
except in Ives Report, where Dr. Engelmann describes its real character as the ordi- 
nary fruit of EUMAMILLARIA. The immature fruit is “oval and green,” but with 
maturity if becomes clavate and scarlet. The Utah specimens of Parry show an 
exceptional character in their 30 to 33 scabrous radial spines, but otherwise they are 
quite normal. MM. microcarpa Engelm., Emory’s Rep. 156. f. 3, Should be dropped as 
a synonym of this species, at least as to figure and description. In all probability 
C. grahami is one of the forms of the Mexican C. schelhasii (Pfeiff.), Exeept that in 
C. grahami the radial.spines are apt to be more numerous and longer, and the cen- 
trals much darker; and in C, schelhasii the 3 centrals seem to be always présent and 
sometimes all hooked, the descriptions suggest no difference. In the absence of 
authentic specimens of the latter species, however, and with its fruit and seed 
entirely unknown, such a reference of C. grahami must be deferred. 
20135—No, 2——2 
8 
