54 SELECTED WESTERN FLORA 



4. A. Lyailii, Wata. 



Perennial, stems several from the same root, loss than 1 ft. high; lower 

 leaves spatulate to lanceolate, J-3 in. long ; upper leaves oblong to lanceolate, 

 1-2 in. long; pods li-3 in. long, erect; flowers white or pinkish. RoBky 

 Mts., and eastward in river valleys. 



** Seeds in 2 bows in the cell. 



5. A, Drumm5ndii, Gray. 



Stem erect, simple, 1-2 ft. high, glabrous or nearly so, and somewhat 

 glaucous; root leaves spatulate, more or less petioled: stem leaves narrowly 

 lanceolate clasping by the base ; flowers white ; pods erect. Rocky banks of 

 streams, Man.-Alta. 



6. A. brachycarpa, (T. and G.) Britton. 



' Resembling the preceding in size and general habit, but the root leaves 

 densely pubescent, and the pods longer and widely spreading. Light or 

 rocky soil, usually in woods, Man.-Alta. 



7. A. Holboellii, Hornem. 



Stems 6 in.-2 ft. high, branched, or more than one stem from the same 

 rosette of root leaves, pubescent at the base, glabrous above; stem leaves 

 sessile, erect, clasping; lower leaves spatulate and sparingly toothed; 

 flowers pink, purple, or whitish; pods mostly on one side of the stem, droop- 

 ing and spreading. Rocky and sandy, places, Man.-Alta. 



9. SISYMBRIUM. Hedge Mustard. 



Pods long, flattened, or somewhat 4-sided, valves nerved; seeds 

 small, slightly oblong, in 1 or 2 rows in the cell; loaves generally 

 divided; flowers small, whitish or pale yellow. 



1. S. altfssimum, L. Tumbling Mustabd. 



Tall, branched, the branches widely spreading; stem leaves deeply 

 pinnatifid, root leaves not so deeply cut; flowers pale yellow; pods very long, 

 rigid, standing out from the stem, and scarcely thicker than the pedicels. 

 Annual or biennial weed, introduced, abundant in waste places. 



2. S. cangscens, Nutt. Gray Tansy Mustard. 



Leaves 1-3 times pinnatifid, whitish with minute soft hairs; flowers very 

 small, yellowish, in long racemes; pods linear or club-shaped, and shorter 

 than the pedicels. Waste places, Man.-Alta. 



3. S. incisum, Engelm. Green Tansy Mustard. 



Resembling the preceding, but green or only slightly whitish; pods 

 more slender and about equal to the pedicels in length. Waste places, 

 Man. to Alta., usually represented by the following varieties. 



