106 KEY AND FLORA 



1. D. diphylla L. TWO-LEAVED TOOTHWORT, PEPPER ROOT, 

 CRINKLE ROOT. Rootstock long, often branched, toothed, eatable, 

 with a flavor like that of cress or radish. Stem leaves 2, close 

 together, each composed of 3 ovate-diamond-shaped and toothed or 

 crenate leaflets ; the basal leaf like the stem leaves. Flowers white. 

 Damp woods. 



2. D. laciniata Muhl. CROW'S-FOOT. Rootstock short, necklace- 

 like. Stem leaves 3-parted ; basal leaf often absent. Flowers white 

 or rose color. Woods. 



XII. CARDAMINE L. 



Annual or perennial. Rootstock often scaly or bulb-bearing. 

 Stem erect or ascending, usually smooth. Leaves more or 

 less divided. Flowers in terminal racemes, white or purple. 

 Petals rather large. Stamens 6. Fruit a linear, flattened pod ; 

 seeds several, in a single row in each cell.* 



1. C. rhomboidea DC. BULBOUS CRESS. Perennial. Root tuber- 

 ous. Stem simple, erect, smooth, without runners, 9-18 in. tall. 

 Lower leaves long-petioled, ovate, orbicular, or heart-shaped, often 

 angled or toothed ; the upper short-petioled or sessile, lanceolate or 

 oblong, toothed or entire. Pedicels |-1 in. long. Petals white, | ^ in. 

 long. Pod erect, linear-lanceolate, tipped by the persistent style; 

 seeds round-oval. Cool, wet places.* 



2. C. pennsylvanica Muhl. BITTER CRESS. Annual. Stem slender, 

 erect, simple, or with a few slender branches, 6-15 in. tall. Leaves 

 mostly in a cluster at the base of the stem, pinnately divided, the 

 terminal lobe roundish, the lateral lobes narrower, somewhat hairy 

 above ; stem leaves nearly linear. Flowers small. Petals white, longer 

 than the sepals. Stamens 4. Pods linear, erect on erect pedicels, 

 about 1 in. long ; seeds oval. In wet places.* 



XIII. ARABIS L. 



Annual or perennial herbs, smooth, or with forked or star- 

 shaped hairs. Basal leaves spatulate ; stem leaves sessile. 

 Flowers usually white. Petals entire, usually with claws. 

 Pods linear, flattened ; seeds often margined or winged. 



1. A. hirsuta Scop. A rough-hairy, erect, leafy-stemmed biennial, 

 1-2 ft. high. Leaves simple ; stem leaves oblong or lanceolate, entire 

 or toothed, somewhat clasping, often with an arrow-shaped base. 

 Flowers small, greenish-white, the petals somewhat longer than the 

 sepals. Pods and pedicels upright. Style almost wanting. Seeds 

 roundish, somewhat wing-margined. Rocks, N. 



