?2 



cm. 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 

 2-3 times the leaves which are 2-3 cm. long, the stem ones sessile, the 

 other with filiform petiole evident. Leaflets flat, rarely contiguous, 

 3-.^ 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 sulcate, 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 pods. 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 lon^^- 

 acuminate stipules. Peduncles filiform and rigid and with the rachis 

 a little surpassing the leaves, with flowers very few and racemos? 

 toward the ends, on pedicels about 2 mm. long which are ni'ich 

 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 rs you look at it broadly ovate. Groove in 

 banner forming a half circle, about 2 mm. wide and extending to tip 

 nf banner. No white spot V'ina-s 1 mm wide, bent up at calyx t'ibe 

 to 45 degrees and exposing keel base, oblaneolate and obtusp. very 

 oblique, 3 mm. long, conrave to keel and close-pressed to it and not 

 quite as long, purple. Keel wUh tip bent abruptly at calyx t'n to 90 

 degrees, acuminate to a sharp tip, about 3 m^m. high and tip d'lrk- 

 purple. Pods often mottled, shaned about like a meat-chopper that is. 

 broadly oblnnceolate-fnlcate, with the deltoid tin erect and end- 

 ing in a long subulate cusp, abo it 1 cm. long, flat toward tip, trl- 

 angular-cnrdnte in the middle by being sulcate. gradually flattening 

 down toward base till completely obcompressed and inclined to be 

 substipitate, seeminsrly b-it not ft all inflated. This has a superficial 

 resemblance only to A. pauciflorus. being manifestly a clos<^ ^Vy 

 to A. humistratus r^nd connecting with the Sericoleucl. On Sandy 

 edges from the Pahria throusrh Kanab prifi the Vir^rin bluffs in the 

 Grand Can-^n region. Lower Temperate life zone. Blooms in Anr'l . 



19. Astragalus humillimus fJray Brandegee's Rep. San Juan 235 

 (1876). Phaca humillima (Gray) Rydberg. Densely caes'iitose and 

 practically aculog-rr^t in small mats f''om very woody and s>^ort 

 branches of the crown. Leaves about 1 cm. long, the fiii<''"rm pet'ole 

 about half the whole. T^eaflets 3-5 pairs, folded, thirk. silvery, .abo-it 

 2 mm. long. Stipules lightly hairy above, closely imbricated, broadly 

 ovate to deltoid. Peduncles a little longer than the leaves. 1.5-2 en. 

 long, with 1-3 flowers racemose at the ends. Flowers hardly 5 mm. 

 long, light-purple, horizontal, on a relatively slender pedicel. Bracts 



