20 COMMON CANADIAN WILD PLANTS. 



root-stock. Leaves pinnate, leaflets 7-15, those of the lower 

 leaves rounded and stalked, entire or nearly so. Bogs. 



3. C. hirsu'ta, L. (SMALL BITTER CRESS.) Flowers white, 

 small. Root fibrous. Leaves pinnate, leaflets 5-11, the 

 terminal leaflets largest. Pods erect, slender. Wet places. 



6. AR'ABIS, L. RoCK CRESS. 

 * Seeds in one row in each cell, nearly as broad as the partition. 



1. A. lyra'ta, L. (Low R.) Flowers white, petals twice 

 as long as the calyx. Stem branching from the base. Radi- 

 cal leaves clustered, pinnatifid, the terminal lobe largest ; 

 stem-leaves scattered, linear, with tapering base. Pods 

 slender, erect, and spreading. Rocky or sandy shores. 



2. A. hirsu'ta, Scop. (HAIRY R.) Flowers greenish- 

 white, small, petals slightly longer than the calyx. Stem- 

 leaves many, rough, sagittate ; often a dense rosette at the 

 base of the stem. Pods erect, straight. Stems 1-2 feet high, 

 2 or 3 from the same root. Rocky shores and dry plains. 



. A. laeviga'ta, DC. (SMOOTH R.) Flowers white, rather 

 small. Leaves linear or lanceolate, entire or slightly toothed, 

 sagittate, clasping. Pods long and narrow, recurved-spread- 

 ing. Stem glaucous, 1-2 feet high. Dry hill-sides. Easily 

 recognized by the pods. 



4. A. Canadensis, L. (SICKLE-POD.) Flowers whitish, 

 with linear petals, about twice the length of the calyx. 

 Stem-leaves pointed at both ends, downy, the lower ones 

 toothed. Pods 2-3 inches long, scythe-shaped, hanging. 

 Stem 2-3 feet high. A striking plant when the pods are 

 fully formed. Dry woods and ravines. 



5. A. petrSB'a, Lam. Petals rose-colour or whitish. Pods 

 shorter and less flat than A. lyrata. Leaves spathulate 

 or oblong, entire or sparingly toothed. Rocks ; reported 

 from New Brunswick. 



* * Seeds in two distinct rows in each cell, narrower than the partition. 



6. A. perfolia'ta, Lam. (TOWER MUSTARD). Flowers 

 yellowish-white. Petals scarcely longer than the calyx. 



