AGAVES OF THE UNITED STATES. 
77 
habit and in never developing a broad pale band down the 
face of the leaf. The group to which all these and a 
number of related forms belong, should receive careful 
study and comparison . Our plant may prove to be a variety . 
•— ►-Leaf with a toothed, horny margin, decurrent for some dis- 
tance below end-spine. — SUBMARGINATAE (Baker). 
A. Utahexsis Engelm. — Suberect, compact; leaves 
linear-lanceolate, concave, rigid, fle.-^hy, glaucous, 12 to 17 
cm. long, 2 to 2.5 cm. wide, or larger, not contracted above 
the broad base; terminal spine 20 to 35 cm. long, stout, 
channeled, gray, with brown base, slightly decurrent; 
margin sometimes repand; prickles 1.5 to 2 mm. long, 
deltoid above, very minute and close-set below ; scape 15 
to 24 dm. high, straight or flexuous; upper 3 to 6 dm. 
florif erous ; panicle narrow ; bracts very slender ; pedicels 
once or twice forked; flowers in 2's or 4's, sometimes in 
6's, 22 to 25 mm. long, yellow, with a very pungent and 
fragrant odor ; perianth about as long as ovary, lobes cut 
nearly to its base; filaments inserted a little below the 
middle of the broadly funnel-shaped tube, 15 to 18 mm. 
long; capsules ovoid, cuspidate, 2 to 3 cm. long above the 
stipe, which measures about 4 mm. ; seeds 4 mm. in great- 
est diameter, marked with flat punctate areoles. — Sereno 
Watson's Botany of 40th Parallel ( 1871), 497: Trans. St. 
Louis Acad. iii. 308, Collected Writings, 308; Baker, 
Amaryllideae, 177. A. Ilaynaldi Tod. var. ll'-iheitsis 
Terr. Monogr. 28. — Figured in "Garden and Fuie.-t," 
1895, 385.— Along Virgen River in Beaver Dam Mt.>>.. 
Utah, as far north as Silver Reef, 4,000 to ) ft. 
altitude; Northern Arizona, south of the Kaihab plateau, 
west to Ivanpah and Resting Springs, California, and east 
to Charleston Mts., Nevada. Abundant throughout North- 
ern Arizona on the Colorado plateau, the rocks in the 
Grand Canon being covered with the plants. — Plate 32. 
1870, one with leaves very repand, 1877. Arizona: 
