360 
On stony ground, between the Pecos and Rio Grande in southwest. 
ern Texas and southern New Mexico, and extending southwest into 
Chihuahua, Coahuila, and San Luis Potosi. 
Specimens examined: TEXAS (Wright of 1549, 1851, 1552; Lemmon 
Gf 1881; G. PR. Vasey of 1881; Hvans of 1891; Nealley of 1892): Ci 
HUAHUA ( Wislizenus of 1846): COATIUILA (Salm- Dyck of 1857; Palmer 
3380, at Saltillo): SAN Luis Porost (Parry & Palmer 272, of 1878.) 
The distinction between horizonthalonius and centrispinus is an untenable one, being 
simply the presence or absence of the central spine. Dr. Engelmann had reached the 
same conclusion after examining a large amount of both living and dried material in 
European collections. I can not discover whether horizonthalonius of Lemaire or 
equitans of Scheidweiler has priority of publication, Both appeared in the same 
year, and hence | have retained the name in common use. Ilavard says that ‘‘this 
species, and perhaps others, under the name of ‘bisagre’ are sliced, candied in 
Mexican sugar, and kept in confectioneries.” 
6. Echinocactus ingens (Karw.) Zuce.; Pfeiff Enum. 54 (1857). 
Melocactus ingens Karw. ex Pfeiffer. 
Echinocactus karwinskii Zuec. ex Labouret, not ex Pfeiffer. 
Glaucescent, globose, or oblong, becoming 15 to 18 dm. high: ribs 8 
(in small specimens, possibly more numerous in large ones), tubercu- 
lately interrupted and with bread sinuses: radial spines 8, reddish- 
brown, straight, rigid, and- interwoven, 2.5 to 3.9 em, long; central 
spine solitary and similar: flowers yellow, about 2.5 cm. long, and a 
little broader: fruit ovate, 3 em. long: seeds reniform, black and 
shining, 4 mm. long.—Type unknown. 
Coahuila and San Luis Potosi, to southern Mexico. 
Specimens examined: COAHUILA (Poselger, without number or date): 
San Luis Porost (Parry d& Palmer 271; Parry of 1878; Weber): 
MEXICO, no State mentioned (Palmer of 1872), 
The spine measurements are taken from small specimens. One ef the largest of 
the genus. 
7. Echinocactus myriostigma (Lem.) Salm, Cact. Hort. Dyck. ed. 1, 22 (1844). 
Astrophytum myriostigma Lem, Cact, Gen, Nov, 4 (1839). 
Cereus callicoche Gal.; Scheidw. Bull. Acad. Brux. vi, 88 (1839). 
Depressed-globose, 12.5 em. in diameter: ribs 5 or 6, very broad, 
covered with numerous somewhat pilose white:spots, and with deep, 
obtuse sinuses: spines none: flowers large, pale-yellow. (//l. Bot. 
Mag. t. 4177; Ill. Hort. t. 292)—Type unknown. 
San Luis Potosi. 
Specimens examined: SAN Luts Povrost (Pringle 3680): also speci- 
mens cultivated in Berlin in L868, and at Cambridge (Mass.) in 1882. 
I have been unable to discover whether the name of Galeotti or that of Lemaire 
has priority, as both were published in the same year. Sometimes called ‘ bishop’s 
hood.” 
** Scales of the ovary ovate, orbicular, or cordate, their axils almost naked: fruit scaly, 
never woolly.—LEIOCARPI. 
+ Central spines flat, stout, and annulate, the lower one more or less recurved and some- 
times hooked: ribs not tuberculalely interrupted.—CORNIGERL. 
++ Spines similar (all stout, reddish, and annulate). 
