APPENDIX. 435 



lets 3-5, obovate or oblong, scattered on tlie winged raohis. Small procumbent or depressed 

 annuals. 



27. H. SUBPINNATA, T. & G. Villous-hirsate or glabrate. See page 62. 



28. H. BRACHYCARPA, Bentb. Softly long-villous, muob branched from tbe base ; flowers larger ; 

 calyx-teeth very much exceeding the tube and ec^ualing or half as long as the oblong or linear-oblong 

 very obtuse villous 2-4-seeded legume.— California. 



ASTRAGALUS. 



With the following very closely allied genus Oxytropis, mainly as revised by Dr. Gray, Proo. Amer. 

 Acad., Vol. VI, pp. 188-234, (1863,) with the addition of the newer species. The grouping is retained as 

 far as possible, though not always very satisfactory. The order is from the perfectly 2-celled species, 

 through the imperfectly 2-oelled, to those with strictly l-oelled legumes. 



Series I. ASTEA.GALUS, L. Pod completely or imperfectly 2-celled by the intrusion of the dorsal 

 suture, the ventral suture being not at all or less deeply indexed. § 5 1-16. 



§ 1. SARCOCAEPI. Pod plum-shaped, succulent, becoming thick and fleshy, indehisoent, not stipi- 

 tate, septum complete. Perennials, with low leafy stems ; stipules distinct, nearly free ; racemes 

 short, spike-lite. 



* Ovary and pod glabrous. 



1. A. CAEYOCAEPtrs, Kcr. Grayish with an appressed pubescence ; flowers violet ; pod globose or 

 ovate, usually pointed. — Saskatchewan to Texas. 



2. A. Mbxicanus, A. DC. Taller, greener, leas pubescent; flowers lighter colored or white; calyx 

 softly white-villous or tomentose ; pod ovate-globose, scarcely pointed. — Missouri to S. Texas and the 

 base of the Kocky Mts. 



* * Ovary hoary-hirsute ; pod sometimes becoming glabrate. 



3. A. Plattbnsis, Nutt. Loosely villous ; stipules rather large ; flowers ochroleucous or purplish 

 above ; pod ovate, acuminate, or oblong and somewhat curved. — Illinois to N. Alabama and west to 

 Nebraska and Texas. 



§ 2. DIPHYSI. Pod ovate or globose, membranous, inflated, nearly glabrous, sessile, completely 

 2-celled and more or less didymous by the intrusion of both sutures, many-seeded. Perennial, 

 many-stemmed; pubescence short or wanting ; stipules distinct, subadnate ; flowers rather small, 

 white to purple or yellowish, spioate or subcapitate. 



4. A. DiPUYSUS, Gray. Nearly glabrous throughout. See page 65. 



5. A. LENTiGmosus, Dougl. More or less cinereous-pubescent. See page 65. 



6. A. PLATYTROPis, Gray. Proc. Amer. Acad. 6. 526. Dwarf and alpine ; silvery-silky. See page 66. 



7. A. COULTBRI, Benth., (Artliu-Scliottii, Gray,) may belong here, but annual ; pubescence appressed- 

 silky ; pod canesoent or " silky- villous," 7-8" long; ohartaceous. Placed in § 16 by Dr. Gray. 



§ 3. CHiETODONTES. Pod ovate, small, sessile, coriaceous, turgid or at times subcompressed, 

 more or less sulcate on the back, septum perfect, cells 3-4-ovuled. Perennial, many-stemmed, 

 leafy, white silky-viUous ; flowers rather small, yellowish, spicate, spreading ; calyx-tube short. 



* Leaflets 10-12 pairs, narrow, usually acute ; stipules free, subulate ; calyx-teeth setaceous, little 

 shorter than the coroUa.— Washington Territory. 



8. A. SPALDiNGn, Gray. Proa. Amer. Acad. 6. 524. (A. chaitodm, Torr.) Villous-pubescent, 1° high; 

 leaflets 3-6" long, lanceolate or oblong-linear; peduncles exceeding the leaves; spike oblong, dense or 

 rather loose at base ; flowers nearly 5" long ; bracts setaceous ; calyx very viUous ; pod 21-3" long, 

 viUons, scarcely sulcate, 2-4-seeded. 



9. A. T;YAT.T.T, Gray. A\aiite-silky ; spike long, loose; peduncles shorter; flowers 3" long; calyx 

 viUous, the tube equaling the teeth ; pod hoary, more deeply sulcate ; otherwise like the last. 



* ' Leaflets 1-5 pairs, oblong or ovate ; stipules adnate, short ; calyx-teeth subulate, shorter than 

 the tube ; pod compressed. 



10. A. OALYCOSUS, Torr. Dwarf, white-silky ; spike 2-6-flowered. See page 66, and Plate XHI. 



J 4. MOLLISSIMI. Pod cartilaginous or coriaceous, sessile, oblong, turgid, terete, sulcate at both 

 sutures, at length incurved, septum perfect. Perennial, subacaulescent, shining with a soft silky- 



