STANDLEY — FLORA OF GLACIER PARK. 349 



Stems 20 to 50 cm. high, aucculent; leaflets mostly 1 to 4 cm. wide; pods 2 to 3.5 cm. 

 long, 1.5 mm. wide. 



2. Cardamine pennsylvanica Muhl. Frequent at low altitudes, in wet woods or 

 thickets or along streams or lakes. B. C. to Oreg., Colo., Fla., and Newf. — Stems 15 

 to 40 cm. high, branched ; leaflets mostly less than 1 cm. wide, often lobed or toothed; 

 pods 2 to 3 cm. long, 1 mm. wide. 



17. DBABA L. Whitlowgrass. 



Annuals or perennials, the pubescence, if any, mostly of branched hairs; leaves 

 entire or toothed, often all basal; petals white or yellow; pods short, linear or oblong, 

 flat. 



Plants annuals or winter annuals; style none. 

 Pods finely hairy. 



Pedicels equaling or longer than the pods; stems leafy 1. D. nemorosa. 



Pedicels shorter than the pods; stems naked or with few small leaves. 



2. D. praealta. 

 Pods glabrous. 



Stems leafy; pods usually 8 to 15 mm. long 3. D. nitida. 



Stems naked; pods mostly 6 to 8 mm. long 4. D. crassifolia. 



Plants perennial; style present except in one species. 

 Stems leafy; plants usually 15 to 40 cm. high. 



Petals white 6. D. cana. 



Petals yellow 6. D. aurea. 



Stems naked; stems usually less than 10 cm. high. 

 Pods densely hairy. 



Pods nearly or fully twice as long as wide 7. D. densifolia. 



Pods nearly as wide as long 8. D. andina. 



Pods glabrous or with a few hairs near the margins. 



Pods nearly as wide as long 9. D. oligosperma. 



Pods twice as long as wide or longer. 



Style none 10. D. fladnizensls. 



Style present. 



Petals yellow 11. D. glacialis. 



Petals wliite. 



Pods twisted; leaves with fine branched hairs ... 12. D. lonchocarpa. 

 Pods not twisted ; leaves with unbranched hairs on the margins. 



13. D. oreibata. 



1. Draba nemorosa L. Moist woods below Lake McDermott. B. C. to Oreg., Nev., 

 Colo., and Mich.; also in Eur. and Asia.— Stems slender, 10 to 30 cm. high; leaves 

 ovate or oblong, usually toothed; petals pale yellow, 2 to 3 mm. long; pods 7 to 15 mm. 

 long, 2 mm. ■wide. 



2. Draba praealta Greene. Rocky slopes near or above timber line. B. C. and 

 Alta. to Wyo. — Stems slender, 10 to 20 cm. high; basal leaves lanceolate or oblanceo- 

 late, with fine branched hairs, 1 to 3 cm. long; petals white, 2 to 3 mm. long; pods 1 cm. 

 long, 2 to 3 mm. wide. 



3. Draba nitida Greene. Frequent on the east slope at middle altitudes, in moist 

 woods or on open banks. Alta. and B. C. to Calif, and Colo. — Stems slender, 10 to 30 

 cm. high; basal leaves oblanceolate, 1 to 3 cm. long, hairy beneath; petals yellow, 2 

 mm. long; pods 2 mm. wide. 



4. Draba crassifolia Graham. Frequent above timber line, in meadows or on 

 rocky slopes. Alaska to Colo., Lab., and Greenl. — Stems slender, 2 to 12 cm. high; 

 basal leaves oblanceolate, 5 to 15 mm. long; petals 2 mm. long, pale yellow or nearly 

 white; pods 2 mm. wide. 



