128 BOTANY. 



with 21-25 rather sharp ribs; the large linear-oblong areolae (very woolly 

 when young) bear three kinds of spines, first, 4 very stout, annulated, reddish 

 ones, l£-2£' long, the 3 upper ones straight, the lower one hooked; second, 

 3-5 lower and usually 3 uppermost spines, slender, but straight, stiff, and 

 annulated, of reddish color; third, 12-20 whitish, bristle-like, flexuous, 

 lateral spines: flowers 2-2£' long, V 2 wide, yellow, outside greenish with 

 purple-brown; ovary and fruit imbricately covered with numerous (50-60) 

 cordate or reniform crenulate sepals; sepals of tube oblong, ciliate ; petals 

 broadly linear, crenate, bristle-pointed; style deeply divided into 12-18 

 linear stigmas; seeds 1" long or over, reticulate or shallow-pitted. — Southern 

 New Mexico. 



Var. Le Contei. (E. Le Contei, Engelm.) — At last clavate from a slender 

 base; lower central spine more flattened, curved or twisted, but not hooked; 

 flower rather smaller and with fewer parts. — This is the Western form, from 

 South Utah and Arizona to and beyond the Colorado River. Dr. Rothrock 

 collected, at Camp Bowie, Ariz., a peculiar form (492), which may repre- 

 sent another variety, decijoiens: globose, 1° in diameter; spines shorter and 

 fewer, no straight spines above the 4 central ones, none longer than 1-1^ 

 inches; 10-15 thin flexuous spines on side and upper end of areolae; only 

 20-25 sepals on ovarjr. 



Echinocactus polycephalus, Engelm. & Bigel. (see Watson in Bot. 

 King's Expl.117). — From the Mojave region to Southwestern Utah. The 

 numerous spiny-bristly sepals, and the linear, acute, yellow petals almost 

 hidden in a dense cottony wool. 



Echinocactus Whipplei, Engelm. & Bigel; Watson, I. c. 116. — On 

 the Lower Colorado River and northward into Utah. 



Cereus (Echinocereus) Engelmanni, Parry; Watson, I. c. 117. — 

 Throughout Arizona and into Utah and Southern California. Flower 

 purple, open only in mid-day sunshine. — Camp Bowie (1002), Mrs. Major 

 Sumner. Flower only. May be this or an allied species. 



Ceeeus (Echinocereus) phceniceus, Engelm. — Globose or oval heads, 

 2-3' high, about 2' in diameter, several to a great many (sometimes over 

 100) from one base, 8-11-ribbed; 8-15 slender, but straight, stiff, and 

 very brittle spines in each bunch, £-!£' long, 1-3 of them more central and 



