74 



THE CRUCJFER FAMILY. 



the temperate parts of Russian Asia; 

 further north only as a weed of cultiva- 

 tion. In Britain, appearing occasionally 

 in corn and flax fields in England and 

 Ireland. Fl. with the corn. 



Fig. 92. 



XVII. AWLWORT. SUBULARIA. 



A dwarf aquatic annual, with the pod of a Draba, but the valves 

 more convex, and the radicle incumbent on the back of the cotyledons, 

 which are linear, and the bend is, as in Senebiera, above the base of 

 the cotyledons, not at their junction with the radicle, as in the rest of 

 Crucifers. 



The genus is limited to a single species. 



1. Water Awlwort. Subularia aquatica, Linn. (Fig. 93.) 



(Eng. Bot. t. 732.) 



The whole plant is but 1 to 2, rarely 

 3, inches high, and perfectly glabrous, 

 usually growing entirely under water. 

 Leaves all radical, nearly cylindrical, 

 slender and pointed, \ to 1 inch long. 

 Flowers few, with minute white petals. 

 Pods about a line and a half long, 

 and oblong, or sometimes shorter, and 

 nearly globular, with 5 or 6 seeds in 

 each cell. 

 In the shallow edges of alpine ponds and lakes, in northern Europe, 

 Asia, and America, and more rarely in central Europe. Scarce in Bri- 

 tain, in the mountains of Scotland, north-western England, and north 

 Wales. Fl. summer. 



Fig. 93. 



