Micranthi. 280 



Prinjrle's No. 6445, distributed as A. Seatoni. Lower Temperate life 

 zone. This is hardly more than a pood variety of A. Hartwegi. 



260. Astragalus hypoleucus Schauer Linntea 20 747 (1847). 

 Pods linear-oblong-, 1-1. G cm. long, 2-3 mm. wide, 1.5-2 mm. high, 

 obcompressed, closely reflexed, a little arcuate, sulcata dorsally 

 \vith V-shaped sulcus, apiculate, with cross section obcordate, with 

 ventral suture a little raised externally, arranged in dense spikes. 

 Flowers spicate to racemose-spicate, white, spreading, or slightly 

 reflexed, 4-5 mm. long. Banner arched to 90' at tip of calyx 

 tube; sides reflexed at base to 90' ; tip notched 1.5 mm. deep; groove 

 barely evident; blade 4 mm. long, 2 mm. wide, oblong. Wings 

 oblong-ovate, hooded, distant from keel and arched over it so that 

 the keel and wings form the figui'^ 3 laid on its side, about 1 mm. 

 wide, 1 mm. high, ascending 10'. Keel very short and blunt, tip 

 incurved at least 100^ Calyx tube villous-woolly, 2 mm. long, cam- 

 panulate, not oblique at base ; teeth triangular, the lower much the 

 longer but not longer than tube. Bracts white-pubescent, 2 mm. 

 long in fruit and closely recui-ved. Flowering pedicels barely evi- 

 dent. Peduncles persistent, with rachis 1-1.5 dm. long, floriferous 

 on the upper one-half to one-third, shallow-sulcate. Leaves all but 

 the lowest sessile, about 5-7 cm. long, often fascicled when they 

 arise from the woody tips of the stems. Leaflets about 10 pairs, 

 broadly to narrowly elliptical, not over 1.2 cm. long, thickish, 

 rounded above, abruptly narrowed at base, rather long-petiolulate, 

 not contiguous, rarely truncate, rather less pubescent above than 

 below. . Stipules connate almost to tip, scarious, barely adnate. 

 Stems simple, floriferous above, lower parts often woody, decum- 

 bent, flexuous, 1-3 ft. long, internodes 3-7 cm. long, shallow-sulcate. 

 Root woody; pubescence of whole plant silvery-white. Zacatecas, 

 Puebla, Nuovo Leon, Hidalgo, and central Mexico. Lower Temper- 

 ate life zone. This has the habit of A. humistratus. 



261. Astragalus oxyrhynchus Hemsley Bot. Cent. Am. 1 265 

 (1880). Pods about 7 mm. long, oblong-ovate, with falcate and 

 very acutely triangular tip, smooth, sulcate dorsally, with reniform 

 cross section, somewhat obcompressed. Flowers 5-7 mm. long, 

 broad, nearly sessile, purple. Banner round, purple-striped, abruptly 

 arched at calyx tips to erect, about 3 mm. long, a trifle longer than 

 wings. Wings oblong, arched, barely longer than the large keel. 

 Keel nearly a half circle, obtuse. Calyx nigrescent, about 2 mm. 

 long, 'teeth subulate and as long as tube. Bracts small, subulate- 

 triangular. Peduncles 2-6 cm. long. Leaves 3-5 cm. long, nearly 

 sessile. Leaflets 6-9 pairs, oblong-linear, 7-10 mm. long, obtuse, 

 ashy with minute short and closely appressed hairs. Stems slender, 

 flexuous, Avidely spreading to prostrate, with slender internodes. 

 Valley of Mexico, San Luis Potosi, and state of Hidalgo. Tropical. 



262. Astragalus Seatoni Jones Cont. 7 676 (1895). Pods half- 

 oblong-oval, apiculate, not acuminate nor long-pointed, about 4 mm. 

 long and 2 mm. wide, minutely stipitate, with nearly round cross 

 section, a little sulcate dorsally and the suture a trifle intruded but 

 not completely 2-celled, nigrescent. Flowers white or whitish, ses- 

 sile, 3-4 mm. long, broad. .Banner round, abrup.ly arched to erect 

 at end of tube, about 2 mm. long. Wings narrovv? and about as 

 long. Keel very arcuate, oblong and rounded, about as long as 

 banner. Calyx almost hemispheiical, about 1.5 mm. long, ni- 

 grescent, the triangular teeth a little shorter. Bracts and pedicels 

 almost none. Peduncles about £s long as leaves, 3-4 cm. , long, 

 axillary, spreading. Leaves wide, 3-4_ cm. long, widely spreading, 

 the upper sessile. Leaflets 10-12 pairs,*8-15 mm. long, linear, nearly 

 smooth. Stipules small. Stems very slender and branched through- 

 out, the branches widely spreading, decumbent from slender root 

 branches, a foot or tv\'o long. Internodes about as long as the 

 leaves, slender and with sparse leaves. Mt. Orizaba Mexico at 

 10,000 ft. alt. Middle Temperate life zone. Seaton. Blooming in 

 July. Bourgeau's specimen belongs to A, oxyrhynchus. 



