STANDLEY FLOEA OF GLACIER PARK. 369 



Plants 30 to 60 cm. high, gray-hairy; leaflets 7 to 10, oblanceolate, 3 to 6 cm. long; 

 corolla 10 to 12 mm. long; pod 5 or 6-seeded. 



6. Lupinus argenteus Pursh. Frequent about east entrance and Belton, in woods 

 or thickets. Oreg. and Calif, to Colo, and N. Dak. — Plants 40 to 80 cm. high, branched ; 

 leaflets 7 or 8, narrowly oblanceolate, flat or folded, 2 to 6 cm. long; corolla violet, 

 1 cm. long; pods 5 or 6-seeded. 



7. Lupinus flexuosus Lindl. Common on the east slope at low and middle alti- 

 tudes, usually on open hillsides. Wash, to Mont. — Plants 30 to 50 cm. high, forming 

 dense bushy clumps; leaflets 7 to 10, oblanceolate, 2 to 4 cm. long; corolla about 1 

 cm. long, violet. 



Our most common and showy species. 



8. Lupinus leucopsis Agardh. Occasional at low altitudes, in thickets or on open 

 slopes. Wash, to Nev., Wyo., and Sask.- — Plants 30 to 60 cm. high; leaflets 6 to 12, 

 oblanceolate, 2 to 5 cm. long; corolla blue, about 1 cm. long; pods 2 to 3 cm. long. 



2. THERMOPSIS R. Br. 



1. Thermopsis rhombifolia (Nutt.) Richards. Yellow pea. Open hillsides and 

 prairie about the east entrance. Sask. to Nebr. and Colo. — Perennial, with root- 

 stocks, nearly glabrous, 10 to 30 cm. high; leaves with large stipules, the 3 leaflets 

 obovate, 2 to 3 cm. long, entire; flowers in racemes, yellow, 1.5 to 2 cm. long; pods 

 lender, spreading, 5 to 6 cm. long, with appressed hairs. 



3. TRIFOLITTM L. Clover. 



Annuals or perennials; leaves with 3 leaflets, the leaflets flnely toothed; flowers 

 small, in heads; pod very small, inclosed by the withered corolla. 



Flowers yellow; plants annual 1. T. procumbens. 



Flowers white, pink, or red-purple; plants perennial. 



Heads not stalked; flowers sessile, red-purple 2. T. pratense. 



Heads slender-stalked; flowers short-stalked, white or pinkish. 



Plants with slender runners, these rooting at the joints; leaflets notched at the 



end 3. T. repens. 



Plants without runners; leaflets usually rounded at the end. 



4. T. hybridum. 



1. Trifolium procumbens L. Hop clover. A few plants along the railroad at 

 Belton. Native of Eur.; naturalized in N. Amer. — Plants slender, with nearly 

 prostrate stems; leaflets obovate, 1 to 1.5 cm. long. 



2. Trifolium pratense L. Red clover. Common on the west slope at low alti- 

 tudes, and extending well up along the trails; scarce on the east slope, but occasion 

 ally found at low altitudes. Native of Eur. ; cultivated and naturalized in N . Amer. — 

 Plants 20 to 50 cm. high, somewhat hairy; leaflets oval or ovate, 2 to 3 cm. long, 

 often with a purplish spot in the middle; flowers about 1.5 cm. long. 



Red clover is abundant in some places about Belton. 



3. Trifolium repens L. White clover. Common on the west slope at low alti- 

 tudes, and occasional on the east slope; often found high up along the trails. Native 

 of Eur. and Asia; widely naturalized in N. Amer. — Stems slender, glabrous; leaflets 

 obovate, 5 to 20 mm. long, glabrous; flowers 7 to 8 mm. long. 



Very abundant in some places about Belton. 



4. Trifolium hybridum L. Alsike clover. Common at low altitudes, especially 

 on the west slope, and extending well up along the trails. Native of Eur.; natural- 

 ized in N. Amer. — Plants 20 to 50 cm. high, glabrous; leaflets broadly obovate, 1 to 

 3 cm. long; flowers 7 to 9 mm. long, nearly always pink. 



This is abundant in woods and along roads near Belton. On both slopes it is more 

 common than white clover; the two usually grow together. 



