66 CRUciFEE^. (mustard family.) 



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

 root4eaves of 3 rounded or cuneate-onate incised leaflets ; petals purple. — Penn. 

 (near Philadelphia, Dr. Diffenbaurjh) and Washington {BM) to Kentucky and 

 southward. April, May. 



4. D. laeini^ta, JIuhl. Bootstock as in the last ; stem-leaves S in a n'horl, 3- 

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

 row teeth, the lateral ones deeply 2-lohed; 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. multiflda, Muhl. More slender and delicate than the last ; root- 

 stock similar; stem-leaves 3 or sometimes 2, alternate, opposite, or whorled, >'«e(j 

 2 - 3-teriiatdi/ divided, or the subdi-visions parted, into very narroioly linear lobes ; 

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

 Kentucky (doubtless) and southward. — This appears to pass into Ko. 4; and 

 all these species except the first probably run together. 



4. CARDAMINE, L. Bittek Chess. 



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 Dioseorides, for some Cress, from the cordial or cardiacal 

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

 * Hoot perennial : leaves simple or 3-foliolate. 



1. C. rhomboidea, DC. (Spring Ceess.) 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 liuear-laueeolate, 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. purptll'ea, Torr. Lower (4' - 6' high), and slightly pubescent ; leaves 

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

 W. New York and mountains of Penn. to Wisconsin and northward. 



2. C. rotundifblia, Michx. (Mocntain Watek-Cress.) Stemsbranch- 

 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, Pennsvlvania 

 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 Jlountains and Katahdin, JIaine 

 (./. ir. Chickering). July. — Flowers 1-5, white. Pods 1' long, turgid, the 

 convex valves l-neiwed. (Eu.) 



* * Root perennial : leaves pinnate ; flowers showy. 



4. G. prat6nsis, L. (Cuckoo Flower.) Stem ascending from a short 



