384 
stoutest; centrals 3 to 8, stouter, deflexed or porrect in every direction: 
flowers near the vertex, 7.5 em. or more long, yellow: fruit subglobose 
and spiny, green or greenish-purple, 2.5 to 3.5 em. in diameter: seeds 
subglobose, 1.2 long, strongly tuberculate. (JU. Cact. Mex. Bound. t. 
39, 40, 41, f. 1 and 2)—Type, Wislizenus of 1846 in Herb, Mo. Bot. Gard. 
Common about El Paso, Texas, thence down to the canyon of the Rio 
Grande, and west into Arizona. 
Specimens examined: TEXAS (Wislizenus of 1846; Wright of 1849, 
1850, 1851, 1852 and 1857; Bigelow of 1852; Miller of 1881; G. Rh. Vasey 
of 1881, Fl Paso; Hvans of 1891; Trelease of 1892): ARIZONA (Lemmon 
of 1881; Wilcox of 1894, Ft. Huachuca): also growing in Missouri Botan- 
ical Garden in 1892 and 1893. 
The whole plant is densely covered by the innumerable ashy-gray or reddish spines. 
When fully ripe the fruit is said to be ‘delicious to eat, much like a gooseberry.” 
5. Cereus dasyacanthus neo-mexicanus, var. nov. 
Differs in the remote areole (1 to 1.5 em, apart), fewer spines (11 
radials and 4 centrals), which are much stouter, 10 to 12 mm, long, radi- 
ating, searcely (if at all) pectinate, and larger seed (1.5 mn. in diam- 
eter).—Type, Wright 366 in Herb, Mo. Bot. Gard, 
Southeastern New Mexico. 
Specimens examined: NEw MEx1co ( Wright 366), 
6. Cereus ctenoides Engelm. Cact. Mex. Bound. 31 (1859). 
Ovate, subsimple, 5 to 10 em, high, 3.5 to 6.5 em, in diameter: ribs 
15 or 16, usually oblique and somewhat interrupted, with crowded 
areol:e (2 min. apart): spines rigid and interlocked, with bulbous base, 
whitish and at length ashy, 2 to 8mm. long; radials 14 to 22, pectinate, 
laterally compressed and often recurved, lowest 2 to 4 mm., lateral 6 
to 8 mm., uppermost 1 to 2 mm. long; centrals 2 or 3 (rarely 4), stout, 
in one longitudinal series, 2 to 6 mm. long: flowers 5.5 to 8 em. long 
and broad, bright-yellow with a light-green center: ovary spiny. (JUL 
loc. t. 42)—Type, the Wright and Bigelow material in Herb, Mo, Bot. 
Gard. 
From Eagle Pass, Texas, to the Pecos, and southward into Coahuila 
and Chihuahua, 
Specimens examined: TEXAS ( Bigelow of 1853, at Hagle Pass; Wright, 
at the Pecos): COAMUILA ( Bigelow of 1853, about Santa Rosa): CHLHUA- 
HUA (Pringle 254 of 1885, distributed as dasyacanthus.) 
A specimen, probably from Oracle, Arizona (vans of 1891), seems to belong with 
these forms, but is hardly referable to any of them. It is simple or proliferous, 
ovate-cylindrical, 10 to 20 em. high, with 16 tuberculate ribs, red-tipped spines, 10 
to 12 radials 6 to 10 mm. long (the upper much shorter), mostly 3 darker-red cen- 
trals, the lower one stouter and slightly deflexed equaling the radials, the 2 upper 
usually much shorter. It is possibly a form of ctencides, but the centrals are not in 
one longitudinal series. There is some uncertainty also as to its station, so that this 
possible western extension of ctenoides can not be alfirmed., 
