Part 5, 1929] FABACEAE: GALEGEAE 299 



21. Xylophacos vespertinus (Sheldon) Rydb. Bull. Torrey Club 

 32:662. 1906. 



Astragalus vespertinus Sheldon, Minn. Bot. Stud. 1: 150. 1894. 



Astragalus Chamaeluce panguicensis M. E. Jones, Proc. Calif. Acad. II. 5: 671. 1895. 



Astragalus argophyllus panguicensis M. E. Jones, Contr. W. Bot. 8: 5. 1S98. 



Astragalus panguicensis M. E. Jones, Contr. W. Bot. 10: 62. 1902. 



Astragalus amphioxys vespertinus M. E. Jones. Rev. Astrag. 215. 1923. 



A perennial, with a cespitose caudex ; stems 4-6 cm. long, decumbent or ascending, strigose- 

 canescent; leaves 2-10 cm. long; stipules deltoid, acute, 5-6 mm. long; leaflets 1 1-15, obovate- 

 elliptic, 4-12 mm. long, white-strigose on both sides with hairs tapering at each end; peduncles 

 5— 10 cm. long; racemes 3— 6-flowered ; bracts lanceolate, 5 mm. long; calyx strigose with mixed 

 black and white hairs, the tube S mm. long, the teeth subulate, 2 mm. long; corolla purple, 

 tinged with magenta or green, 2.5 cm. long or more; banner obovate, deeply notched; wings 

 nearly as long, the blades oblong; keel-petals with the blade broadly lunate; pod straight, 

 oblong, abruptly acute, obcompressed, strigose, finely cross-reticulate, the upper suture promi- 

 nent, 2.5-3.5 cm. long, 6 mm. wide, and 8 mm. thick. 



Type locality: Grand Junction, Colorado. 



Distribution: Southwestern Colorado, New Mexico and southern Utah. 

 Illustrations: M. E. Jones, Rev. Astrag. pi. 47 (as var. panguicensis); pi. 51 (as var. ves- 

 pertinus); Contr. W. Bot. 10: pi. 4. 



22. Xylophacos missouriensis (Nutt.) Rydb.; Small, Fl. SE U. S. 

 620, 1332. 1903. 



Astragalus missouriensis Nutt. Gen. 2: 99. 1818. 



Astragalus melanocarpus Nutt.; [Fraser, Cat. 1, hvponvm. 1813. | Richards, in Frankl. Journey 746. 



1823. 

 Tragacantha missouriensis Kuntze, Rev. Gen. 946. 1891. 



A perennial, with a cespitose caudex; stems several, less than 1 dm. long, leafy, decumbent, 

 or descending ; leaves 5-10 cm. long, ascending; stipules deltoid, 3-5 mm. long; leaflets 9-15, 

 elliptic or oval, 5-10 mm. long, strigose-canescent on both sides; peduncles erect, stout, 8-10 

 cm. long, usually exceeding the leaves; racemes short, 5-12-flowered; bracts lanceolate, often 

 5 mm. long; pedicels very short; calyx strigose, more or less black-hairy, the tube about 7 mm. 

 long, oblique at the base, the teeth about 2 mm. long; corolla 15-20 mm. long, rose-purple; 

 banner obovate, retuse at the apex; wings slightly shorter, the blade lunate, with a broad basal 

 auricle ; keel-petals somewhat shorter and broader, with a smaller auricle ; pod oblong, straight, 

 abruptly acute at the apex, strigulose, strongly cross-reticulate, about 2 cm. long, 7-8 mm. wide, 

 splitting along the prominent sutures, somewhat compressed in age. 



Type locality: "Upper. Louisiana" [probably South Dakota]. 

 Distribution: Alberta and Saskatchewan to Oklahoma and New Mexico. 



Illustrations: M. E. Jones, Rev. Astrag. pi. 50, f. 173; Fl. Neb. 21: pi. 10. f. 5S-5V; Britt. & 

 Brown, 111. Fl. /. 2138; ed. 2./. 2547. 



4. Pygmaei. Cespitose subacaulescent perennials. Leaves densely silvery strigose- 

 canescent. Pod oblong or elliptic, leathery, strigose, the pericarp becoming spongy in age. 



23. Xylophacos cymboides (M. E. Jones) Rydb. Bull. Torrey Club 

 40:49. 1913. 



Astragalus cymboides M. E. Jones, Proc. Calif. Acad. II. 5: 650. 1895. 

 Astragalus amphyoxys cymbellus M. E. Jones, Rev. Astrag. 115. 1923. 



A perennial, with a cespitose matted caudex; stems very short, covered by leaf -bases and 

 stipules; leaves 3-8 cm. long, ascending; stipules triangular-ovate, 5-S mm. long, pubescent; 

 leaflets 7-11, oval or obovate, 5-10 mm. long, 4—6 mm. wide, acutish, strigose-canescent; 

 peduncles decumbent, rarely exceeding the leaves; racemes 5-10-flowered; bracts ovate or 

 lanceolate, 3-5 mm. long; calyx strigose-canescent, the tube 7 mm. long, oblique at the base, 

 the teeth subulate, about 1 mm. long; corolla about 1.5 mm. long, usually dirty-white, with 

 purplish tips; banner obovate, deeply notched; blades of the wings oblong, slightly arcuate; 



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