348 BRASSICACEAE 



verticillate. Flowers perfect, in terminal racemes or corymbs. Sepals equal at 

 the base, erect or nearly so. Petals white or purplish, with slender claws and 

 spreading blades. Pods elongate, linear, flattish or nearly terete, the valves 

 with faint or no midnerve, elastically dehiscent from the base; style slender; 

 stigma entire or rarely 2-lobed. Seeds in one row in each cell, somewhat flattened, 

 but not margined. Cotyledons accumbent. 



1. D. rupicola (O. E. Schulz) Rydb. Perennial, with tuberous rootstock; 

 stem glabrous, 1-3 dm. high; basal leaves palmately divided into 3-5 mucronate 

 oval divisions; stem-leaves or bracts 1-3, 3-5-divided, with elliptic-oblong divi- 

 sions; petals 10 mm. long, white; pods about 3 cm. long, nearly 2 mm. wide, 

 tapering at both ends; beak 5-6 mm. long. Cardamine calijornica rupicola 

 O. E. Schxilz. Mountains: Mont. Submont. — Mont. Jl. 



38. CARDAMINE L. Bitter Cress. 



vVnnual or perennial herbs, with alternate, entire or pinnate leaves. Flowers 

 perfect, in racemes or panicles. Sepals equal at the base, erect or ascending. 

 Petals white or purple, obovate to narrowly spatulate. Pods elongate, many- 

 seeded, narrow, flattened, the valves nerveless or nearly so, elastically dehiscent 

 at maturity. Seeds in one row in each cell, not margined. Cotyledons accum- 

 bent. 



Leaves all entire. 



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



entire-margined. 1. C. bellidi folia. 



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 petioled. 



Flowers about 1 cm. long; leaves not thick. 



Plant glabrous or nearly so. 3. C. cordifolia. 



Stem densely pilose; leaves also hairy. 4. C. infausta. 



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



5. C. Leibergii. 

 Some of the leaves at least pinnate. 



Petals .5-12 mm. long. 



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



6. C. angulata. 

 Petals about 5 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. vallicola. 



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 tlian 1 mm. long. 



Stem few-leaved; petals 3-4 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. pennsylvanica. 

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

 stem densely hairy below. 12. C. muUifnlia . 



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



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



1. C. bellidifolia L. Dwarf tufted perennial; stems branching, 5-15 cm. 

 high; leaves petioled, simple; blades 5-10 ram. long; petals spatulate, 3-4 mm. 

 long; pods erect, 2-2.5 cm. long, fully 1 mm. wide, on short pedicels. Arctic- 

 alpine situations: Greenl. — -N.H. — Wash. — Alaska; Eu. Alp. Jl-Au. 



2. C. Douglasii (Torr.) Britton. Perennial, with a slender tuberiferous 

 rootstock; stem more or less pubescent, 1.5-4 dm. high; leaves simple, the lower 

 blades cordate, 1-3 cm. broad, sinuate, the upper ovate, usually coarsely dentate; 

 petals obovate, pink or purple, 8-12 mm. long; pod 2-3 cm. long; beak 3-4 mm. 

 long. C. rhomboidea purpurea Torr. C. purpurea (Torr.) Britt., not Cham. & 

 Schlecht. Springy places: Que. — Md. — Mo. — Alta. Boreal. Ap-My. 



3. C. cordifolia A. Gray. Perennial, with a rootstock; stem 3-6 dm. high; 

 leaf-blades cordate, 2-5 cm. long, sinuately toothed; petals about 1 cm. long, 



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