340 , LEGUMINOSiE. Oxytropis. 



7. O. Plattcnsis (Nutt. ! mss.): "stemless and somewhat casspitose, ca- 

 nescently villous; leaflets oblong-elliptical or oblong-lanceolate, more or less 

 acute; scape longer than the leaves; flowers in interrupted spikes; bracts 

 subulate, siiorter than the calyx; teeth of the calyx nearly half the length of 

 the tube; wings dilated and emarginate. 



"Plains of the Platte. — Differs Irom O. Lamberti in its shorter and wider 

 leaflets, and in the longer teeth of the calyx." Nvtiall. — This plant strongly 

 resembles O. Lamberti /?., and seems to differ chiefly in being whiter, more 

 villous, and in the looser, interrupted spikes. 



8. O.Hooken'ana (Nutt. mss.): "stemless, somewhat csespitose ; pilose ; 

 leaflets linear-lanceolate, acute at each end ; scapes longer than the leaves ; 

 flowers in somewhat interrupted spikes ; bracts foliaceous, lanceolate-linear, 

 nearly the lengtli of the calyx ; teeth of the calyx subulate, nearly as long as 

 the tube ; wings dilated and emarginate. 



" Plains of the Platte. May-June. — Also allied to O. Lamberti ; but the 

 leaves are nearly green and loosely pilose, with the flowers (purple) smaller 

 and the calyx shorter and more deeply divided. It is also a more dwarf spe- 

 cies." Nuttall. — We have seen no specimens of this plant. 



9. O. Lagopus (Nu.Xl.): nearly stemless, silky-lanuginous, rather dwarf; 

 leaflets oblong-elliptical, about 4 pairs: flowers (5-6) capitate and some- 

 Avhat umbelled ; calyx cylindrical, densely clothed Avith white silky hairs, 

 longer than the ovate bracts ; the teeth subulate, half the length of the tube. 

 — Nutt. ! in jour. acad. Philad. 7. p. ]7. 



About the sources of the Missouri, Mr. Wyeth! (from Nuttall.) — Root 

 long and thick. Caudex divided above into several short crowded branches, 

 which bear tufts of whitish leaves. Leaflets about 3 lines long. Peduncles 

 1-2 inches long. Flowers closely approximated, violet-blue. Corolla scarce- 

 ly exserted : vexillum obcordate ; wings oblong : keel with a short straight 

 rather obtuse point. Ov^ary glabrous. Ripe legumes not seen. — This spe- 

 cies may prove to be a Phaca. 



10. O. 7iana (Nutt. ! mss.) : "stemless, cEespitose, dwarf, canescently pi- 

 lose ; leaflets about 3 pairs, elliptical-oblong, somewhat acute ; scapes longer 

 than the leaves ; head few-flowered ; bracts ovate-lanceolate, shorter than the 

 very woolly calyx ; teeth of the calyx short; wings dilated and emarginate. 



" Plains of the Platte in the Rocky Mountain range. — Scapes 2-3 inches 

 high. Flowers large for the size of the plant, purple. — Distinguished 

 from O. Lamberti, which it resembles in some respects, by its dwarf sta- 

 ture, and the small number of its leaflets." Nuttall. 



11. O. lii'o'resceHS (Fischer) : stem very short, divided above into several 

 procumbent branches ; leaflets 3-5 pairs, elliptical, rather acute, villous ; sti- 

 pules and calyx villous with blackish hairs ; peduncle 2-flowered, as long as 

 the leaves; legumes oblong, inflated, pubescent, 1-celled. DC. prodr. 2. p. 

 278 ; Hook. fl. Bor.-Am. 1. 2^- 147. Astragalus nigrescens, Pall. Astrag. 

 p. 65, t. 63, ex DC. 



Island of St. Lawrence in Behring's Straits. — Flowers bluish-purple, rather 

 large. Keel with a small, but evident point. DC. — A native also of Eastern 

 Siberia. 



* * Flowers ochrolcucous. 



12. O. cainpestris (DC.) : leaflets many pairs, lanceolate, silky ; scapes 

 ^ften decumbent, usually longer than the leaves ; spikes capitate (sometimes 

 ^elongated) ; flowers erect ; bracts a little longer than the calyx ; legumes 

 erect, oblong-ovate, inflated, rostrate, pubescent, half 2-celled. — DC. prodr. 

 2, p. 278; Richards.! app. Frankl. journ. ed. 2. p. 28; Hook.! fl. Bor.- 

 Am. 1. p. 147. 



