STANDLEY FLORA OF GLACIER PARK. 345 



Pods not flattened . 



Pods linear, many times longer than thick. 



Plants glabrous; leaves broad, pale, entire 12. CONRINGIA. 



Plants with fine appressed hairs; leaves narrow, green, often toothed. 



13. CHEmiNIA. 

 Pods less than twice as long as thick. 



Pods inflated and bladder-like, constricted in the middle ... 5. PHYSAB.IA. 

 Pods not inflated and bladder-like. 

 Plants gray with a close covering of fine branched hairs, low, usually less than 



15 cm. high 6. LESQTJERELLA. 



Plants green, with coarse hairs, tall, usually 30 to 60 cm. high. 



7. CAMELINA. 

 Leaves, at least the lower ones, deeply lobed or divided. 

 Pods about as broad as long, flattened. 



Pods 3-cornered 3. BURSA. 



Pods rounded 1. LEPIDITIM, 



Pods decidedly longer than broad, or rarely short but then not flattened. 

 Flowers white. 



Plants densely and finely white-hairy; pods lanceolate 4. SMELOWSKIA. 



Plants green, slightly if at all hairy; pods linear. 



Sides of the ripe pods recurving as the pod opens; plants growing in wet soil. 



16. CARD AMINE. 

 Sides of the pod remaining straight after the opening of the pod; plants 



mostly growing in dry soil 18. ARABIS. 



Flowers yellow. 

 Pod with a long (5 to 15 mm.) distinct beak; upper leaves usually not lobed. 



15. BRASSICA. 

 Pods not beaked, or the beak very short (2 to 3 mm.); upper leaves usually 

 lobed. 



Pods 4-angled ; plants glabrous 14. CAMPE. 



Pods not 4-angled ; plants glabrous or hairy. 

 Hairs of the stems branched ; leaves twice divided into numerous small 



narrow lobes 11. SOPHIA. 



Hairs of the stem simple; leaves once lobed, the lobes often large and 

 broad. 



Pods less than 2 cm. long 8. RADICULA. 



Pods 3 to 10 cm. long. 



Pods 7 to 10 cm. long; stem with spreading hairs 9. NORTA. 



Pods 3 to 4 cm. long; stem with minute appressed hairs. 



10. DIPLOTAXIS. 

 1. LEPIDITIM L. 



1. Lepidium densiflorum Schrad. PepperCxRASs. Frequent at low altitudes, in 

 waste or cultivated ground or on open slopes; apparently introduced. Yukon to 

 N. Mex., N. Y., and Vt. — Annual, 20 to 50 cm. high, branched above, finely hairy; 

 basal leaves lobed, the stem leaves narrow, toothed; petals minute or wanting; pod 

 flat, rounded, 3 mm. long, notched at the apex. 



2. THLASPI L. 



1. TMaspi arvense L. Fanweed. Common at low altitudes, especially on the east 

 slope, in waste or cultivated ground or on prairie. Native of Eur. ; introduced as a 

 weed in N. Amer. — Glabrous annual, 10 to 50 cm. high; stem leaves oblong, toothed, 

 clasping; flowers white, in long racemes, long-stalked; petals 4 mm. long; pods 

 flat, rounded, 1 to 2 cm. long, broadly winged, notched at the top. 



In cultivated ground this is often very abundant. Soon after flowering the plants 

 turn yellow, and they are then conspicuous, even at a distance. In some parts of 



