32 CEuciFERiE. (mustard tamily.) 



2. D. inAxima^ Nutt. Rootstoch interrupted, farming a string of toothed 

 tubas ; stem-leaves (2-7) mostly 3 and alternate ; leaflets 3, ovate, obtuse, coarsely 

 toothed and incised,, often 2-3-cleft. (D. laciniata, var. S., Torr. Sf Gr.) — W. 

 New York, and Penn., Nutiall J Watertown, New York, Dr. Crawe ! May. — 

 Stem 10' -2° {Niitt.) high: raceme elongated. Flowers larger than in No. 1, 

 purple. Joints of the rootstock l'-2' long, J' thick, starchy. The leaves are 

 intermediate between No. 1 and No. 3. 



3. D. laciniiita, Muhl. Rootstock necklace form, consisting of a chain 

 of 3 or 4 nearli) toothless oblong tubers ; stem-leaves 3 in a whorl, 3-paried ; the 

 leaflets linear or lanceolate, obtuse, iiTegularly cut or cleft into narrow teeth, tlie 

 lateral ones deeply 2-lobed. — Rich soil along streams, W. New England to 

 Wisconsin and Kentucky. May. — A span high: raceme scarcely longer than 

 the leaves. Tlowers pale purple. Root-leaves much dissected. 



4. I>. Iieterophylla., Nutt. Rootstock necklace-form, obscurfely toothed ; 

 stem-leaves 2 or 3, small, alternate, 3-parted, the leaflets lanceolate and nearli/ entire ; 

 root-leaves of 3 round-ovate obtuse somewhat toothed and lobed leaflets. — West- 

 em Pennsylvania, Virginia, and Kentucky. May. — A span high, slender: 

 stem-leaves 1' long. Mowers few, purple. 



5. CARD AMINE, L. Bitter Ceess. 



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

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

 less; their stalks slender. Cotyledons accumbent. — Flowers wlute or purple. 

 (From KapSafiov, an ancient Greek name for Cress.) — Runs into Dentaria on 

 the one hand; into Arabis on the other. 



* Root perennial : leaves simple or 3-folioldte. 



1. C. rhom'boidca, DC. (Spring Cress.) Stems upright, tuberifer- 

 ous at the base ; stems simple ; root-leaves round and rather heart-shaped ; lower 

 stem-leaves ovate or rhombic-oblong, somewhat petioled, the upper almost lan- 

 ceolate, all somewhat angled or sparingly toothed ; pods linear-lanceolate, point- 

 ed with 11 slender style tipped with a conspicuous stigma ; seeds round-oval. — 

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



Var. piirpnrca, Ton-. Lower (4' -6' high) and slightly pubescent; 

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

 soil, W. New York to Wisconsin. 



2. C. rotundifolia, Michx. (American Water-Cress.) Stems 

 branching, weak or decumbent, with creeping 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 Unear-awl-shaped, pointed with 

 the style; stigma minute; seeds oval-oblong . {Sill. Journal, 42. p. 30.). — Cool, 

 shaded springs, Penn., and southward along the mountains. May, June. — 

 Leaves with just the taste of the English Water-Cress. Runners in summer 

 l°-3° long. Flowers white, smaller than in No. 1. 



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

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



