MISSOUEI BOTANICAL GARDEN. 
Huachuca Mountains, Arizona, from an elevation of 5,000 
feet to the top of the mountains. — Plates 40 and 41. 
Professor Tourney states that the plants often have a 
purplish cast which extends even to the flowers. 
Specimens examined: — From J. G. Lemmon, September, 
1883; C. G. Pringle, June, 1884, 5,000 to 8,000 feet; Dr. 
T. E. Wilcox, 1893; Professor J. W. Tourney, July 17, 
1894. 
«-M- Stamens inserted near the middle of tube. 
= Leaves relatively broad and short, deep-green, not glaucous ; plant 
caulescent, globose. California. 
A. Shawit Engelm. — Shortly caulescent, growing in 
large, dense rosettes from 5 to nearly 10 dm. in diameter, 
and, including the trunk, of about the same height ; trunk 
20 to 30 cm. long, clothed with the bases of the old leaves ; 
leaves oblong-spatulate, acuminate, 25 to 40 cm. long, 8 
to 12 cm. wide, 5.5 cm. thick at the cushion-like lower 
portion, broadest above the middle, deeply concave with 
narrowly acuminate effect in upper portion of young 
leaves; end-spine stout, 30 to 35 mm. long, channeled 
above, rounded below ; margin broad, decurrent nearly or 
quite to base ; prickles largest at middle of leaf, 6 to 15 
mm. long, lanceolate, deltoid, close-set, generally turning 
outward and upward; color of end-spine, margin and 
prickles creamy white with a light salmon tint, changing 
successively to yellow, salmon, red, brown and gray as the 
leaves are maturing; margin and prickles sometimes be- 
come detached as in A. Lechuguilla; scape 24 to 36 dm. 
high, 50 to 65 cm. thick, nearly covered with leafy, ap- 
pressed, deltoid-acuminate bracts 8 to 15 cm. long, with 
brown scarious margins and spiny tips; branches of panicle 
flattened, 10 to 22 cm. long, longest ones towards the 
middle, all subtended by large .spreading bracts; flowers 
sessile at ends of branches in large compact clusters of 
20 to 30, surrounded by thick, leafy bracts; flowers 75 to 
87 mm. long; perianth greenish-yellow, infundibular. 
