94 FOXnSTOATIONS OF BOTANY 



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



size, yeUow. Brassica, IV. 



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



ellipsoid. Flower 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 leaf y-stenmied ; growing in or near water. 



Pods linear. Cardamine, VII. 



(b) 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, Touni. 



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. Peppeegrass, 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.* 



