383 
oceurring in bands about the plant. In the Evans specimen, from Brewster County, 
New Mexico, the ribs are 14, the radial spines as many as 20, and the centrals 8 or 4, 
a form which was also seen among the plants cultivated in the Missouri Botanical 
Garden. 
2. Cereus viridiflorus tubulosus, nom. nov. 
Cereus viridifiorus cylindricus Fugelm. Syn, Cact. 278 (1856), not C. cylindricus 
Haw. 
Larger and becoming cylindrical, 7.5 to 20 em. high and 2.5 to 5 em 
in diameter: spines 4 to 121mm. long; the central (when present) longer 
(12 to 20 mm.) and stouter: petals acute. (ZU. Cact. Mex. Bound. t 
36)—Type, Wright of 1851 in Herb. Mo. Bot. Gard. 
Southwestern Texas, from the Pecos to the region about El Paso. 
Specimens examined: TEXAS (Wright of 1851; Evans of 1891): also 
numerous specimens in cultivation. 
3. Cereus chloranthus Engelm. Syn. Cact. 278 (1856). 
ylindrical, simple or sparingly branching at base, 7.5 to 25 em. high, 
3.5 to 5 em. in diameter: ribs 13 to 18, somewhat interrupted: radial 
spines [2 to 20, laxly radiant and peetinate, setiform and white, 4 to 10 
mm. long, the lower laterals longest (8 to 10 min.) and often purplish at 
apex, upper ones shortest, > to 10 additional shorter setaceous ones 
above; centrals 3 to 6 (uove in young plants), the two upper shorter 
(12 mm ), divergent upward and mostly purplish, the 1 to 3 lower ones 
longer (18 to 30 mm.), divergent and detlexed, white: flowers 2.5 em. 
long, yellowish green, always low down on the plant (usually below 
the middle): fruit subglobose, 1.2 cm. in diameter or less, spiny: 
seeds orbicular and compressed, 1.0 to 1.2 mm. in diameter, contluent- 
tuberculate. (1//, Cact. Mex. Bound. t. 37 and 38)—Type, Wright and 
Bigelow specimens in Herb. Mo. Bot. Gard. 
Common on stony hills about 1 Paso, Texas, and in adjacent New 
Mexico. 
Specimens examined: TEXAS (Wright of 1851 and 1852; Bigelow of 
1852; G. FR. Vasey of 1881, 1 Paso; Le Conte 12; Briggs of 1892; Tre- 
lease of 1892): NEW MEXICO (vans of 1891: Nealley of 1891): also 
growing in Missouri Botanic Garden in 1892 and 1893. 
+ + Flowers yellow: central spines 5 to Gmm. long: radials crowded. 
4. Cereus dasyacanthus Engelm. Pl. Fendl. 50 (1849). 
Echinocereus dasyacanthus Engel, Wisliz. Rep. 16 (1848). 
Ovate or subeylindric, 12.5 to 30 em. high, 5 to 10 em, in diameter, 
simple or sparingly branched at base, subcespitose: ribs 15 to 21, 
Straight or oblique, somewhat interrupted, with crowded areolie: spines 
20 to 30, straight, rigid, stellately spreading, porrect in every direction 
and interlocked, ashy-gray or reddish (white in weaker plants); radials 
16 to 24, laterals longest (12 to 14 mm.) and somewhat bulbous at base, 
upper shorter (6 to 8 mm.) and slender, lower about 10 mm. long and 
8898—No. 7——3 
