66 CRUCIFEILE. (MUSTARD FAMILY.) 



3 lanceolate or linear-oblong somewhat toothed (sometimes incised or 2-cleft) leaflets; 

 root-leaves of 3 rounded or cuneate-ovate incised leaflets ; petals purple. Penn. 

 (near Philadelphia, Dr. Diffenbaugh) and Washington (Bebb) to Kentucky and 

 southward. April, May. 



4. D. laciniata, Muhl. Rootstock as in the last ; stem-leaves 3 in a whorl, 3- 

 parted ; the leaflets linear or lanceolate, irregularly cut or cleft into prominent nar- 

 row teeth, the lateral ones deeply 2-lobed ; root-leaves similarly dissected; petals 

 pale purple or nearly white. Rich soil along streams, W. New England to 

 Wisconsin and Kentucky. April, May. 



5. D. multifida, Muhl. More slender and delicate than the last ; root- 

 stock similar ; stem-leaves 3 or sometimes 2, alternate, opposite, or whorled, finely 

 2 - 3-ternately divided, or the subdivisions parted, into very narrowly linear lobes ; 

 root-leaves similarly 3 - 4-ternately divided; flowers (4-7) white. Southern 

 Kentucky (doubtless) and southward. This appears to pass into No. 4; and 

 all these species except the first probably run together. , 



4. CAKDAMINE, L. BITTER CRESS. 



Pod linear, flattened, usually opening elastically from the base ; the valves 

 nerveless and veinless, or nearly so. Seeds in a single row in each cell, wing- 

 less ; their stalks slender. Cotyledons accumbent. Flowers white or purple. 

 (A Greek name, in Dioscorides, for some Cress, from the cordial or cardiacal 

 qualities.) Runs into Dentaria on the one hand, into Arabis on the other. 

 * Root perennial : leaves simple or 3-foliolate. 



1. C. rhomboidea, DC. (SPRING CRESS.) Stems upright from a tuberif- 

 erous base, simple ; root-leaves round and rather heart-shaped ; lower stem-leaves 

 ovate or rhombic-oblong, somewhat petioled, the upper almost lanceolate, all 

 somewhat angled or sparingly toothed ; pods linear-lanceolate, pointed with a 

 slender style tipped with a conspicuous stigma ; seeds round-oval. Wet mead- 

 ows and springs ; common. Flowers large, white. April -June. 



Var. purptirea, Torr. Lower (4' - 6' high), and slightly pubescent ; leaves 

 rounder; flowers rose-purple, appearing earlier. Along streams in rich soil, 

 W. New York and S. Pennsylvania to Wisconsin and northward. 



2. C. rotundifblia, Michx. (MOUNTAIN WATER-CRESS.) Stems branch- 

 ing, weak or decumbent, making long runners; root fibrous; leaves all much alike, 

 roundish, somewhat angled, often heart-shaped at the base, petioled, the lowest 

 frequently 3-lobed or of 3 leaflets; pods linear-awl-shaped, pointed with the 

 style ; stigma minute ; seeds oval-oblong. Cool shaded springs, Pennsylvania 

 and southward along the mountains. May, June. Leaves with just the taste 

 of the true Water-Cress. Flowers white, smaller than in No. 1. 



3. C. bellidifblia, L. Dwarf (2' -3' high), tufted; leaves ovate, entire, 

 or sometimes 3-lobed (4" long), on long petioles ; pods upright, linear ; style 

 nearly none. Alpine summits of the White Mountains and Katahdin, Maine 

 (/. W. Qhickering). July. Flowers 1-5, white. Pods 1' long, turgid, the 

 convex valves 1 -nerved. (Eu.) 



' * * Root perennial : leaves pinnate : flowers showy. 



4. C. prat6nsis, L. (CUCKOOFLOWER.) Stem ascending from a short 



