94 FOUNDATIONS OF BOTANY 



(c) Pods cylindrical ; seeds globular. Flowers of moderate 

 size, yellow. Brassica, IV. 



((/) Pods cylindrical. Flowers white. Or pods ovoid or 

 ellipsoid. FloM^er yellowish. Aquatic plants, or 

 growing in wet soil. Nasturtium, VI. 



C. 



Pods elongated, often jointed, tapering toward the tip, never splitting 

 open. , Raphanus, V. 



D. 



Pods flattened parallel to the partition, splitting open when ripe. 



(a) Wild species leafy-stemmed ; growing in or near water. 

 Pods linear. Cardamine, VII. 



(J) Wild species ; stems naked below, bearing only 2 or 3 

 leaves. Pods lanceolate, Dentaria, VIII. 



(c) Wild species ; leafy-stemmed ; growing on dry ground 



or rocks. Pods linear; seeds usually winged or 

 margined. Arabis, X. 



(d) Cultivated species. Pods round or roundish. 



Lobularia, XI. 



(e) Cultivated species, covered with a grayish down of 



star-shaped hairs. Pods cylindrical. 



Matthiola, XII. 



I. LEPIDIUM, Toum. 



Annual ; stem erect, or sometimes diffuse. Leaves entire, 

 toothed, or pinnately divided. Flowers in a terminal raceme, 

 small, white. Petals short, sometimes wanting. Stamens 2, 

 4, or 6. Pod rounded or obcordate, flattened contrary to the 

 partition.* 



1. L. virginicum, L. Peppergrass, Birds' Pepper, Tongue- 

 grass. Stem erect, smooth, much branched, 1-2 ft. high. Lower 

 leaves obovate in outline, pinnately cut with dentate lobes ; upper 

 leaves lanceolate, dentate, slightly downy. Flowers on slender 

 pedicels, petals present, sometimes reduced in the later flowers. 

 Stamens 2. Pod round. A weed growing in waste places.* 



