STANDLEY FLORA OF GLACIER PAEK. 371 



Leaflets 1.5 to 4 mm. wide. 



Pods flattened from the sides; leaflets obtuse 4. A. tenellus. 



Pods uot flattened ; leaflets notched at the apex 5. A. flexuosus. 



Leaflets 5 to 20 mm. wide. 

 Pods sessile in the calyx, thick and hard, not inflated; flowers nearly sessile. 



6. A. carolinianus. 

 Pods stalked, thin, inflated; flowers slender-pediceled ... 7. A, americanus. 

 Leaflets finely or coarsely hairy on both surfaces, rarely glabrous on the upper 

 surface, but the flowers then purple. 

 Pods glabrous or nearly so. 



Leaflets with loose spreading hairs 8. A. aboriginum. 



Leaflets with appressed silky hairs 9. A. forwoodii. 



Pods densely hairy. 

 Leaves and stems with loose spreading hairs; flowers pale yellow. 



10. A. drummondii. 

 Leaves and stems with fine appressed hairs; flowers purple or purplish. 



Flowers 6 to 8 mm. long; pods about 8 mm. long .... 11. A. vexilliflexus. 

 Flowers 15 to 20 mm. long; pods 10 to 25 mm. long. 



Pod about 1 cm. long, not compressed; leaflets green, thinly silky. 



12. A. goniatus. 

 Pod 1.5 to 2.5 cm. long, compressed; leaflets gray, densely silky. 



13. A. missouriensis. 



1. Astragalus alpinus L. Frequent above timber line, on open rocky slopes or 

 rock slides; also along creek at east entrance. Alaska to N. Mex., Vt., and Lab.; 

 also in Eur. and Asia. {Tium alpinuvi Rydb.)— Stems ascending or spreading, 

 10 to 25 cm. high, slender; leaflets 13 to 25, oval or rounded, 4 to 10 mm. long, with 

 appressed hairs on one or both surfaces, usually shallowly notched; flowers purplish, 

 8 to 12 mm. long; calyx black-hairy; pod about 1 cm. long. 



2. Astragalus macounii Rydb. Frequent at low and middle altitudes and some- 

 times above timber line, in moist woods or tliickets, along streams, or on open slopes. 

 B. C. and Alta. to Colo. (Atelophragvia vmcounii Rydb.) — Stems slender, 30 to 60 

 cm. high, nearly glabrous; leaflets 9 to 17, oval or oblong, 1.5 to 3 cm. long, glabrous 

 on the upper surface; calyx black-hairj' ; corolla about 8 mm. long; pods 1.5 to 2 

 cm. long. 



Above timber line the plants are sometimes only 10 cm. high. 



3. Astragalus bourgovii A. Gray. Common above and near timber line, in meadows 

 and on rock slides; sometimes in woods or on open slopes at middle altitudes. 

 B.C. and Mont, to S. Dak. {Eomalobus bourgovii Rydb.) — Stems slender, 10 to 30 

 cm. long, erect or ascending, densely tufted; leaflets numerous, oblong, 4 to 10 mm. 

 long, ^vith sparse appressed hairs on both surfaces; flowers 8 to 10 mm. long, in a lax 

 raceme, purple or violet; calyx black-hairy; pod 1 to 1.5 cm. long. 



A graceful and handsome plant, often abundant in alpine meadows. 



4. Astragalus tenellus Pursh. Occasional on the east slope at low altitudes, in 

 creek beds or on open hillsides. Yukon to Utah and Nebr. (Eomalobus tenellus 

 Britton.)— Stems stout, erect, 20 to 40 cm. high, tufted; leaflets 13 to 21, linear or 

 narrowly oblong, 8 to 12 mm. long, nearly glabrous; flowers about 1 cm. long, in short 

 dense racemes; pods 8 to 12 mm. long, about 3 mm. wide, short-stalked. 



5. Astragalus flexuosus Dougl. Hillsides at east entrance, Uvibach. Alta to 

 Utah, N. Mex., and Minn. {Ilomalobus flexuosus Rydb.) — Stems erect or ascending, 

 30 to 60 cm. long; leaflets 13 to 21, narrowly oblong, 5 to 15 mm. long, nearly glabrous; 

 flowers about 1 cm. long, in long loose racemes; calyx white-hairy; pods 1.5 to 2 cm. 

 long, 4 mm. thick, with appressed hairs. 



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