AN UNDESCRIBED AGAVE FROM ARIZONA. 
BY J. W. TOUMEY. 
AGAVE TRELKEASII, n. sp.— An acaulescent perennial with short root- 
stock and fleshy-fibrous roots; leaves 20 to 40 cm. long, 15 to 25mm. broad, 
convex on lower and nearly flat on upper side; terminal spine horny, 
brownish, 12 to 19 mm. long, terete or slightly flattened and grooved on 
upper side; margin at base membranous (never serrulate), remainder 
filiferous with several fragile white fibers, not marking with white lines 
the adjoining leaves in separating in the bud as in allied species; scape 
18 to 25 dm. high with moderately slender bracts; inflorescence sub- 
spicate; flowers usually in twos, sometimes from three to six, yellow, 35 
to 50 mm. long and a third to a fourth as wide; perianth lobes short- 
linear to obovate, curved inward at the apex and on the sides; filaments 
inserted much above the middle of the tube; ovary twice as long 
as broad; fruit unknown. — Type specimens in herb. J. W. Toumey. 
Living co-types in succulent garden University of Arizona; Missouri 
Botanical Garden, St. Louis; and in garden Department of Agriculture, 
Washington, D. C. 
This well marked species of the Filiferae group of Agave 
grows on the rocky, southern slopes of the Santa 
Catalina Mountains in southern Arizona, being found 
in particular abundance in the type locality on the moun- 
tain known as Castle Rock, where two plants were collected 
by the writer in December, 1896, and planted in the succu- 
lent garden at the University of Arizona. These plants 
have produced numerous offsets and one bloomed in the 
summer of 1899. Instead of sending up a stipe from the 
center of the plant, several lateral stipes were produced as 
offsets, although the central bud was uninjured. These 
stipes were without leaves at the base, but appeared above 
the ground as naked stalks sometimes a foot or more from 
the plant. 
The species appears to be most nearly related to Agave 
Schottit but differs from it in many particulars. It is a 
larger plant in every way, the leaves are nearly twice as 
Separates issued April 6, 1901. (75) 
