430 
35. Opuntia mesacantha cymochila (Kngelm.). 
Opuntia rafinesquii cymochila Engelm. Syn. Cact. 295 (1856). 
Opuntia rafinesquit cymochila montana Engelin, and Bigel. Pacif. R. Rep. iv, 42 
(1856). 
With orbicular mostly armed joints 6 to 8.5 em. broad, pulvini 1.2 to 
1.6 cm. apart, straw-colored or yellowish bristles, 1 to 3 stout white 
(often reddish-brown at base) subcompressed or twisted spreading or 
deflexed spines 2.5 to 5cm. long (often 2 or 3 smaller detlexed ones 
added), short obovate fruit 2.5 to 3 em. long, and irregular twisted 
undulate-margined seeds 5mm. broad. (JIL. Pacif. R. Rep. t. 12, f.1-3; 
t. 23, f. 10-12)—Type, the Bigelow specimens in Herb. Mo. Bot. Gard. 
From Kansas to southwestern Texas, Arizona, and Utah. 
Specimens examined: KANSAS (Hall of 1870): TExAs (Bigelow of 
1852; V. Bailey of 1892, Washburn): NEw MExtico (Bigelow of 1853; 
Wvans of 1891, Stein’s Pass and Deming): ARIZONA (Palmer 302; Wil- 
cox of 1894, Ft. Huachuca): UTAH ( Watson 454), 
36. Opuntia mesacantha stenochila (Iingelm.). 
Opuntia rafinesquii stenochila Engelm., Syn. Cact. 296 (1856). 
Prostrate, with obovate joints 10 cm. long by 7.5 em, broad, pulvini 
2.5 cm. apart and only the upper ones armed, yellowish or greenish ris- 
tles, solitary white spine 2.5 to 3 em. long with sometimes | or 2 smaller 
deflexed ones added, long obovate-clavate green or pale red very juicy 
fruit 3.5 to 6 em. long and with a broad umbilicus, and regular thick 
very narrow and obtuse-margined seeds 5 min. broad. (J/l. Pacif. R. 
Rep. iv, t. 12, f. 4-6; t. 23, f. 9)—Type, Bigelow of 1853 in Herb. Mo. 
Bot. Gard. 
‘Canon of Zuni, western New Mexico.” 
Specimens examined: NEW MEXx1co (Bigelow of 1853), 
37. Opuntia mesacantha macrorhiza (Engelm.). 
Opuntia macrorhiza Engelm. Pl. Lindh, 206 (1850). 
Opuntia rafinesquii macrorhiza Engelm. Syn. Cact. 296 (1856). - 
Opuntia rafinesquit fusiformis Engelm., 1. c. £97. Dy 
Prostrate or ascending, with elongated fusiform irregularly thickened 
root, orbicular-obovate very green joints, most or only upper pulvini 
- armed, yellowish-brown bristles, 1 to 3 stout or slender white or vari- 
egated spreading or deflexed spines 2.5 to 3 em. long (often 1 or 2 
additional slender deflexed ones), flowers 5 to 7.5 cm. broad, ovate 
(scarcely clavate) fruit green or pale-purple, 3.5 cm. long, and thick 
almost regular acute-margined seeds 5.5 mm. broad. (J/l. Cact. Mex. 
Bound. t. 69; Pacif. R. Rep. iv, t. 12, f. 7, 8; t. 23, f. 6)—Type, Lind- 
heimer of 1843-45 in Herb. Mo. Bot. Gard. 
From the “ Big Bend” of the Missouri River to the Guadalupe River 
of Texas and Arizona; in sterile rocky places. 
Specimens examined: TExAs (Lindheimer of 1843-45, 1850, 1872; 
Wright of 1852; Parry of 1869; Hall of 1872): ARIZONA (Bigelow of 
1853, on Deer Creek): KANSAS ( Wislizenus of 1846, type of fusiformis; 
wD 
