446 BOTANY, 



tube; corolla purple, 3-4" long ; pod ovate-oWong, 3" long, hoary, half-included in the calys.-Upper 

 Nebraska to the Kocky Mts. 



Series III. An anomalous species, the keel very sharply acuminate in the manner of Oxytropis, the pod 

 with the dorsal suture alone inflexed, as in Astragalus proper. 



128. A. HOTHOXYS, Gray. Diifuse from an annual root, cinereous-puberulent ; stems slender, 3-12' 

 long; stipules nearly free, distinct; leaflets 6-9 pairs, ovate-oblong or oblong, 3-6" long, often retuse, 

 glabrate above; peduncles 3-6' long; raceme short, spikelike; calyx-teeth subulate, shorter than the 

 oblong tube ; oorolld; violet, i' long, the broad and short incurved apex of the keel abruptly contracted 

 into a short very acute porrected cusp ; pod broad-linear, 8-11" long, falcate, puberulent, thm-coriaceous, 

 sulcate dorsally and nearly 2-celled, the ventral suture rather prominent.— Arizona. 



Obscure species. 



A. DIAPHANUS, Dougl. HooTc. Fl. Bor.-Amer. 1. 151. Prostrate and diffuse, pilose-scabrous; stipules 

 small, ovate, acuminate ; leaflets 5-9 pairs, obovate ; peduncles shorter than the leaves ; flowers in loose 

 beads, purple, about 6" long; bracts minute, ovate, acuminate, rather shorter than the pedicels ; pods 

 scarcely 1' long, linear, much flattened, falcate, somewhat reflexed, nearly glabrous, 2-celled, many-seeded, 

 somewhat diaphanous.— Near the Great Falls of the Columbia, (Douglas.) 



A. POLAEis, Benth. Trans. Linn. iSoc. 23. 323. Glabrous or sparingly pubescent ; stems shortly diffuse ; 

 stipules connate ; leaflets 11-15, ovate or oblong, retuse or emarginate-bifid ; peduncles about equaling the 

 leaf, 1-4-flowered ; calyx-teeth a little shorter than the tube ; corolla about 3 times longer than the calyx, 

 the keel shorter than the wings and banner ; pod nearly sessile, erect, broadly linear-oblong, inflated, mem- 

 branous, 1' long, 3-4 times exceeding the calyx, black-hairy, rounded at the ends, dorsal suture not in- 

 truded. — Resembling A. alpinus. Eschscholtz Bay, (Seemann.) 



A. GiBBSii, Kell. Trans. Calif. Acad.. 2. 161,/^. 50. Canesceutly short- villous ; stems 1-2° long; 

 stipules slightly aduate, distinct ; leaflets 8-10 pairs, obcordate, cuneate, petiolulate, i' long, rarely as 

 wide, the lowest approximate to the stem ; peduncles exceeding the leaves, 8-10' long ; bracts ovate, 

 acute, equaling the pedicels; flowers 1' long, 15-20 in a short raceme, spreading, pale-purple; calyx-teeth 

 broad, acute, 4 times shorter than the tubular-campanulate gibbous densely white-pubescent tube ; keel 

 with a short incurved obtuse apex, shorter than the subvillous banner and wings ; ovary linear-oblong, 

 pubescent, stipitate, 6-7-ovuled, the ventral suture slightly inflexed ; stipe half the length of the calyx.— 

 Headwaters of the Carson River, California, (Gibbs.) 



Phaca DEBiLis, Nutt. T. 4- G., Fl. 1. 345. Somewhat pubescent, or glabrous below ; stems slender, 

 short, decumbent ; stipules slightly adnate, acuminate ; leaflets 8-11 pairs, about 3" long, cuneate-oblong, 

 somewhat truncate or emarginate at apex, petiolulate, minutely appressed-hirsute beneath ; petioles 

 rather long ; peduncles exceeding the leaves ; flowers 10-15, in close heads or short spikes, pale-purple, 

 about 5" long ; the banner deeply emarginate ; calyx grayish-pubescent, the subulate teeth about equaling 

 the tube. — Pod unknown. " Plains of the Rocky Mts., near streams," (Nuttall.) 



Phaca pahvifolia, Nutt. T. Sf G., Fl. 1. 348. Slender, canescent, subciBspitose ; stems very short ; 

 lower stipules united, upper ones triangular-ensiform ; petioles long; leaflets 5-8-pairs, very small, 

 lanceolate-linear, mostly acute ; rachis flattened and slightly winged ; peduncles slender, exceeding the 

 leaves ; flowers 5-7, purple, in a short raceme ; calyx-tube short, black-pubescent, a little exceeding the 

 acute teeth; pod pubescent, sessile, terete and somewhat boat-shaped, acute. — Rocky Mts., toward the 

 sources of the Platte, (Nuttall.) Dr. Gray conjectures that this may be a form of A. ordboides. 



"A. VAGINATUS, Pall. SooTc. Fl. Bor.-Amer. 1. 149. Erect, pubescent ; leaflets linear-lanceolate, acute ; 

 peduncles longer than the leaves ; flowers white and purple, in dense spikes, nodding ; pods linear, 

 straight. — Wooded country of subarctic America, (Richardson.) " Referred by Planchon to Phaca auatra- 

 lis." — Said to be very similar in habit to A. aboriginum. 



OXYTROPIS. 



(A.) Calyx becoming bladdery in fruit. 

 § 1. CALYCOPHYSiE. Fruiting calyx inflated, globose, including the ovate chartaceous-mem- 

 branous pod, which is somewhat half-2-celled by the intrusion of the ventral miture. Matted- 

 casspitose, subacaulescent ; scapes 2-flowered. 

 1. 0. MULTICBPS, Nutt. Canescently-silky, 1-3' high; leaflets 3-4 pairs, about 3" long; flowers 

 purple, G" long ; pod short-stipitate.- Rocky Mts. of Colorado and S. Montana. 



(B.) Calyx unchanged. 

 § 2. PHYSOCARPiE. Pod inflated, membranous, the ventral suture only thickened within or in- 

 truded. Acaulescent, the scape umbellately or capitately 2-6-flowered. 



