94 MISSOURI BOTANICAL GARDEN. 
Solitary to densely cespitose, acaulescent. Leaves essentially 
smooth, gray, broadly oblong, acute or somewhat acuminate, very 
openly concave, 6-10 X 25-30, or exceptionally 15x 40 em., stiffly 
erect-spreading: spine nearly straight, gradually tapered, from 
chestnut becoming gray, 5-6> 20-25 mm., very openly grooved or 
becoming flattened nearly to the end, rather long-decurrent: prickles 
similarly colored, 15-20 mm. apart, 3-5 mm. long, straightish or pre- 
vailingly gently recurved, narrowly triangular, abruptly lenticularly 
widened to 5 or 10 mm. at base or the upper ones confluent on the 
slightly concaved margin. Inflorescence {8-5 m. high, the upper 
third or half oblong-paniculate: scape moderate: bracts triangular, 
rather close, spreading or reflexed in age: branches somewhat 
ascending: pedicels rather stout, about 5 mm. long. Flowers creamy 
yellow, 55-60 mm. long; ovary about 80 mm. long, fusiform: tube 
openly conical, 8-10 mm. deep: segments 517 mm., about twice as 
long as the tube and half as long as the ovary: filaments inserted 
nearly in the throat, 35 mm. long and about twice as long as the 
segments. Capsules dark brown, broadly oblong or pyriform, 20 35 
-40 mm., little stipitate but somewhat beaked: seeds 6 8 mm. 
Northern Arizona to southeastern New Mexico (where it 
reaches its greatest development), and northern Chihuahua. 
—Pl. 91-98. 
Specimens examined:—Arizona. Rocky Cafion (Roth- 
rock, 274, 1874,—to be accepted as the type, since it afforded 
the first complete material). San Francisco Mountains 
(Parry, 1867, —the source of the earlier distribution of seeds 
into European gardens). Without locality (Bischoff, 1871). 
New Mexico. Copper Mines, Sta. Rita, near Silver City 
(Emory, 1846,—the type of A. americana latifolia). Fort 
Bayard (Bertolet, 1877). Silver City (Greene, 1880). Bear 
Mountain (Rusby, 411, 1881). Las Cruces (Wooton, 1895). 
Humboldt Mountain (Mulford, 397, 397a, 1895). Mogollon 
Mountains (Metcalfe, 262, 1903). Organ Mountains 
(Standley, 541, 1906). Cutnuanua. Mountains near Colo- 
nia Garcia (Wooton, 73, 1899). 
Agave Couesii Engelmann in herb. 
A, Parryi Engelmann, Trans. Acad. Sci. St. Louis. 8: 312, 1875; . 
Bot. Works. 310.—As to Coues citation. 
Cespitose, acaulescent. Leaves essentially smooth, very gray, dull, 
nearly oblong, slightly acuminate, very openly concave, about 6 < 25 
