82 
em. long, flat, contiguous and leaves sessile and short. Pods ovate, 
acute, about 6 mm. long, oblique and inflated but not conspicuously 
arcuate, cross section, inclined to be reniform and dorsal suture raised 
as in the species. Racemes short. This is a common form grow- 
ing in the shade on the Mogollon plateau of the San Francisco peaks. 
Astragalus humistratus var. tenerrimus Jones Cont. 7 649 (1895). 
This is the most slender form of the species with filiform stems grow- 
ing in loose mats even 3 ft. in diameter, elongated filiform peduncles 
-3 times the leaves which are 2-3 cm. long, the stem ones sessile, the 
other with filiform petiole evident, Leaflets flat, rarely contiguous, 
3-5 mm. long, oval to elliptical, about 5 pairs, rounded and obtuse, 
nearly smooth, Flowers about 8 mm. long, few. Pods broadly oblong 
and arcuate to 45 degrees, laterally flattened, about 1 cm. long, and 
5 mm. high, not suleate, smooth. In the parks of the Kaibab or 
Buckskin Mts. Arizona, overlooking the Grand Canon under the shade 
of the spruces and pines. Middle Temperate life zone. In gravel. 
18. Astragalus sesquiflorus Watson Proc. Am. Acad. 10 346 
(1875). Phaca Rydberg. Leaves all on filiform rigid petioles which 
are mostly as long as leaf-rachis, 2-3 cm, long. Leaflets 3-4 pairs, 
barely contiguous, linear-elliptical, very acute at both ends, 3-7 mm. 
long. Whole plant hoary except the peds. Stems in dense, soft and 
not compact, 1-3 dm. wide tufts with innumerable branches only a few 
inches long rising a few inches above the ground, the internodes only 
on the longer stems rarely much surpassing the recurved and lonz- 
acuminate stipules. Peduncles filiform and rigid and with the rachis 
a little surpassing the leaves, with flowers very few and racemose 
toward the ends, on pedicels about 2 mm. long which are much 
shorter than the filiform, elongated, recurved and long-hairy bracts. 
Calyx Hedeoma-like, that is campanulate or conic, acute at base and 
equally inserted but not at all compressed nor oblique, the tube about 
2 mm. long, and the subulate and arched teeth about 3 mm. long. 
Flowers bluish-purple, 5-8 mm. long. Banner bent sharply at the 
end of keel to erect, sides scarcely at all reflexed, about 4 mm. wide, 
with oval outline, but 2s you look at it broadly ovate, Groove in 
banner forming a half circle, about 2 mm. wide and extending to tin 
of banner. No white spot Wings 1 mm wide. bent up at calyx tube 
to 45 degrees and exposing keel base, oblaneolate and obtuse, very 
oblique, 3 mm. long, concave to keel and close-pressed to it and rot 
quite as long, purple. Keel with tip bent abruptly at calyx tin to 90 
degrees, acuminate to a sharp tip, about 3 mm. high and tip d^rk- 
purple. Pods often mottled, shaned about like a meat-chopper that is, 
broad!y oblanceolate-falcate, with the deltoid tin erect and end- 
ing in a long subulate cusp, about 1 em. long, flat toward tin, tri- 
angular-cordate in the middle by being suleate, gradually flattening 
down toward base till completely obcompressed and inclined to be 
substipitate, seemingly but not at all inflated. This has a superficial 
resemblance only to A. paueiflorus, being manifestly a close ally 
to A. humistratus and connecting with the Sericoleuci. On Sandy 
edges from the Pahria through Kanab ana the Virgin bluffs in the 
Grand Canon region. Lower Temperate life zone. Blooms in Aprii. 
19. Astragalus humillimus Gray Brandegee’s Rep. San Juan 235 
(1876). Phaca humillima (Gray) Rydberg. Densely caespitose and 
vractically acavlescent in small mats from very woody and short 
branches of the crown. Leaves about 1 cm. long, the fitif-rm petiole 
about half the whole. Leaflets 3-5 pairs, folded, thick, silvery, about 
2 mm. long. Stipules lightly hairy above, closely imbricated, broadly 
ovate to deltoid. Peduncles a little longer than the leaves, 1.5-2 em. 
Jong, with 1-3 flowers racemose at the ends. Flowers hardly 5 mm. 
long, light-purple, horizontal, on a relatively slender pedicel. Bracts 
