369 
It still further emphasizes the fact that the generic lines in Cactacew are of very 
uncertain definition. 
28. Echinocactus scheerii Salm, Cact. Hort. Dyck. 155 (1850). 
Globose or ovate, 3.5 to 5 cm. in diameter, from a long terete root: 
ribs 13, deeply tuberculate-interrupted, the tubercles ovate and grooved 
half way down: radial spines 15 to 18 (or 11 to 13 in younger speci- 
mens), strictly radiant, 6 to 12 mm. long, about equal, setaceous and 
rigid, straight or a little recurved, white or straw-color with dark apex, 
the uppermost sometimes elongated; central spines 3 or 4, angled, 
brownish-black and white variegated, the upper ones straight, diver- 
gent upward, 12 to 24 mm. long, the lowest one shorter, porrect and 
hooked: flowers greenish-yellow, about 2.5 em, long, much less in 
diameter: fruit small, green, almost naked: seeds large (about 2 mm. 
long), brown and minutely tubereulate. (J//. Cact. Mex. Bound. t. 17)— 
Type unknown. 
In the region about Eagle Pass, on the Rio Grande, Texas, and south- 
ward into northern Mexico. 
Specimens examined: TEXAS (Poselger 5 of 1850; Schott of 1854): 
MEXICO, no State recorded ( Weber of 1866). . 
This species is also suggestive of a very close alliance with Cactus. The prominent 
tubercles are not arranged in very evident ribs, and the woolly groove extending half 
way down the tubercle is suggestive of Cactus macromeris. The relationship becomes 
still more emphasized if the seeds ageeompanying the Poselger specimens, from which 
the seed description is drawn, be really those of scheerii. They are the only brown 
seeds I know in Echinocactus, and the cotyledons are much smaller than is usual in 
the genus. 
b. Ribs acute: flowers large (4 to 7.5 em. long). 
29. Bchinocactus pubispinus Mngelm. Trans. St. Louis Acad. ii, 199 (1863). 
Small, turbinate, oval, 5 em. high, 2.5 to 3 em. in diameter: ribs 13, 
somewhat oblique, compressed and tuberculate-interrupted: spines 
velvety-pubescent, at length naked, white with dusky apex; radial 
spines 5 or 6 below, 9 to 12 above, 2 to 8 mm. long, the upper 1 or 2 
stouter and longer, straight or curved or hooked ; central spine wanting, 
or occasionally a single stouter, longer (10 to 12 mm.) one, erect and 
always strongly hooked: flowers and fruit unknown.—Type, H. Engel- 
mann of 1859 in Herb. Mo. Bot. Gard. 
Pleasant Valley, near Salt Lake Desert, Utah. 
Specimens examined: Urau (/7, Engelmann of 1859). 
The species seems never to have been rediscovered. 
30. Echinocactus sinuatus Dietr. Allg. Gart. Zeit. xix, 345 (1851). 
Echinocactus setispinus sinuatus Poselger, Allg. Gart, Zeit. xxi, 119 (1853). 
Echinocactus setispinus robustus Poselger, l, ¢. 
Echinocactus treculianus Lab. Monogr. Cact. 202 (1858). 
Globose, 10 to 20 em. in diameter, bright-green: ribs 13, oblique, 
acute, and tuberculate-interrupted, the tubercles shortly grooved : radial 
spines 8 to 12, setiform and flexible, the 3 upper and 3 lower purplish- 
