104 BRASSICACEAE 



38. CARDAMINE L. Bitter Cress. 



Leaves all eDtire. 



Plant dwarf, less than 1 dm. high, with a slender rootstock; leaf-blades oval, usually 



entire-margiiied. 1. C. bellidifolia. 



Plant more than 1 dm. high; blades at least of the stem-leaves sinuately toothed. 

 Plant 1—4 dm. high; upper leaves subsessile. 2. C. Douglasii. 



Plant 3-6 dm. high; all leaves petloled. 



Flowers about 1 cm. long; leaves not thick. 



Plant glabrous or nearly so. 3. C cordifolia. 



Stem densely pilose; leaves also hair jr. 4. C. infausUi. 



Flowers about 0.5 cm. long; leaves thickish, sinuately round-lobed. 



5. C. Leibergii. 

 Some of the leaves at least pinnate. 



Petals .'5-12 mm. long. 



Petals 8-12 mm. long; leaflets 3, rhombia, 3-lobed or sinuately 3-toothed. 



6. C. angulata. 

 Petals about S mm . long ; leaflets 1-9, the terminal one much larger, cordate, ovate, 



or reniform, sinuately toothed. 

 Beak of the fruit about 2.5 mm. long. 7. C. valUcola. 



Beak of the fruit about 1 mm. long. 



Only a few of the leaves pinnate. 5. C. Leibergii. 



Most of the leaves pinnately 3-7-foliolate. 8. C. Breweri. 



Petals 2—4 mm. long. 



Leaflets of the stem-leaves usually only 3. 9. C unijuga. 



Leaflets of the stem-leaves 5-11. 



Leaves glabrous; seeds small, more than 12 in each pod. 

 Beak of the pod less than 1 mm. long. 



Stem few-leaved; petals 3^ mm. long; racemes contracted, corymbi- 



form, shorter than the subtending leaves. 10. C. umbellata. 



Stem very leafy; petals 2-3 mm. long; raceme elongate. 



Leaves thin; leaflets usually broad; stem glabrous or nearly so. 



11. C, pennsyhanica. 

 Leaves thick; leaflets of the upper leaves narrow, linear or oblong; 

 stem densely hairy below. 12. C. muUifolia. 



Beak of the pod more than 1 mm. long. ■ 13. C. acuminata. 



Leaves with scattered hairs ; seeds large, 6-12 in each pod. 14. C. oligosperma. 



39. DRABA L. Whitlow Grass, Draba. 



Winter annuals. 



Style slender, 12 mm. long; filaments dilated. 1. D. asprella. 



Style obsolete. 

 Pods hairy. 



Leaves all crowded on the lower part of the stem; flowers white; racemes short, 

 on long naked peduncles. 

 Pods linear, appressed-hirsute; leaves entire. 



Inflorescence even in fruit corymbiform; petals minute or none. 



2. D. micrantha. 

 Inflorescence in fruit elongate; petals conspicuous. 



3. D. coloradensis. 

 Pods oblong or elliptic, with spreading branched pubescence, often stellate ; 



leaves usually tootlied. 4. D. cuneifolia. 



Leaves more or less scattered on the stem ; flowers yellow or in age sometimes 

 white. 

 Basal leaves obovate, ovate, or oblong; stem-leaves ample; pedicels longer 



than the pods. 5. D. nemorosa. 



Basal leaves oblanceolate to oblong; stem-leaves smaller, oblong-lanceolate; 



pedicels shorter than the pods. 



Pedicels divergent; leaves hirsute. 6. D. montana. 



Pedicels ascending; leaves stellate, not hirsute. 7. D. praealta. 



Pods glabrous. 



Pedicels in fruit reflexed; petals white. 8. D.defleza. 



Pedicels ascending or spreading ; petals yellow (except in No. 12) . 

 Stem more or less leafy. 



Pods 2-4 mm. long; stem-leaves thick. 9. D. brachycarpa. 



Pods 6-8 mm. long; leaves thin. 



Basal leaves obovate; stem-leaves several, broad; pedicels twice 



as long as the pod. 10. D. lutea. 



Basal leaves oblanceolate; stem-leaves very few and small; pedicels 

 slightly, if at all, longer than the pod. 11. D. nitida. 



Stem scapiform or with a single leaf; leaves in a basal rosette. 

 Basal leaves spatulate; pods more than 1 cm. long. 



Basal leaves broadly spatulate, finely stellate; petals white. 



12. D. Macouniana. 

 Basal leaves spatulate, but not broadly so, hirsute as well as stellate; 

 petals yellow. (Depauperate forms of) 11. D. nitida. 



Basal leaves oblanceolate to linear, hirsute or glabrate; pods 5-8 mm. 

 long. 

 Basal leaves oblanceolate or spatulate, hirsute. 13. D, crassifolia. 

 Basal leaves narrowly Unear-oblanceolate, glabrous, except the very 

 sparingly ciliate margins. 14. D. Parryi. 



