385 
+++ Flowers red: radial spines crowded. 
++ Central spines very short (longer in radians) or none. 
7. Cereus cespitosus Engelm. Pl. Lindh. 247 (1845). 
Echinocereus cespitosus Engelm. Wisliz. Rep. 26 (1848). 
Cereus concolor Schott, Engelm. Pacif. R. Rep. iv, errata and notes, ii (1856). 
Cereus cwspitosus minor and major Engelin. Syn. Cact. 280 (1856). 
Ovate-globose to ovate-cylindrical, usually 2.5 to 5 em. in height and 
diameter (rarely as much as 12.5 to 15 em. high and 5 to 9 em. in dia- 
meter), cespitose (often 5 to 12 heads) or sometimes almost or quite 
simple: ribs 12 or 13, straight, with confluent tubercles and approx1- 
mate areolie: spines white (sometimes rosy or brown), somewhat or not 
at all interlocked; radials 20 to 30, pectinate, straight or subrecurved, 
the upper and lower shorter, the lateral longer (4 to 8 min.); centrals 
none, or rarely | or 2 very short ones: flowers rose-purple, 5 to 7.5 em, 
long and broad, the tube with numerous extra-axillary pulvini bearing 
brown or black bristles: fruit green, ovate, 18 to 20 mm. long: seed 
obliquely obovate, strongly tuberculate, black, 1.2 to 1.4 mm. long, some- 
times almost globose. (Zll. Cact. Mex. Bound. t. 43 and 44)—Type, 
Lindheimer 402 of 1845 in Herb. Mo. Bot. Gard. 
From the Canadian and Arkansas rivers, in Indian Territory, south- 
ward through Texas east of the Pecos, and into the states of Mexico 
east of Chihuahua. Apparently the most eastern Cereus, with a west- 
ern limit near the 100th meridian. 
Specimens examined: TEXAS (Lindheimer 402 of 1845 and 1851 ; 
Wright of 1849 and 1850; Smith of 1856; Hall 235; Miss Soulard of 
1883): COAHUILA (Mo, Bot. Gard. of 1890): San Luts Potos1 (Eschan- 
eter of 1891): also cultivated in Harvard Botanic Garden in 1846 and 
1849; and in Missouri Botanic Garden in 1845 and 1846. 
This species is said by Prince Salm to be cultivated in Europe under the name 
Echinopsis reichenbachiana, and to be confused with pectinatus. The Eschanzier 
material from San Luis Potosi often has 3 central spines, but cespitosus is dis- 
tinguished from its allies by having several lower spines much shorter and weaker 
than the laterals. 
8. Cereus ceespitosus castaneus Engelm. Pl. Lindh. 203 (1850), 
Differs in having chestnut-brown or reddish spines.—Type, Lind- 
heimer of 1847 in Herb. Mo. Bot. Gard. 
Southeastern Colorado to eastern Texas. 
Specimens examined: TEXxAs (Lindheimer of 1847 and 1852; Hall 
235 of 1875, near Austin; T'release of 1892): COLORADO (Brandegee of 
1875): also cultivated in Harvard Botanie Garden in 1882, 
9. Cereus pectinatus (Scheidw.) Engelm. Pl. Fendl. 50 (1849). 
Echinocactus pectinatus Scheidw. Bull. Brux. v, 492 (1838). 
Echinocactus pectiniferus Lem. Cact. Nov. 25 (1838), 
Lichinocereus pectinatus Engelm. Wisliz. Rep. 25 (1848). 
Cereus pectiniferus Lab, Mon. Cact. 320 (1858). 
Ovate-cylindrical, simple, 17 to 18 em. high: ribs 18 to 23, tubercu- 
late-interrupted, with approximate areole: radial spines 16 to 20, sub- 
recurved, appressed-pectinate, white with rosy tip, upper and lower 
