42 THE CRUCIFER FAMILY. [Draba. 



very minute. Pods about 2 lines long, on spreading pedicels, in a long, 

 slender raceme, each containing about 6 seeds. 



On rocks and walls, in limestone hilly districts, in Europe and northern 

 Asia, from the Mediterranean to Scandinavia. In Britain sparingly 

 scattered over several, parts of England, and introduced into Scotland 

 and Ireland. Fl. spring. 



5. D. verna, Linn. (fig. 93). Whitlow grass. A dwarf annual, lasting 

 but a few weeks, the leaves all radical, ovate or oblong, seldom above 

 half an inch long, and closely spreading on the ground. Peduncles 

 slender, erect, 1 to 3 or rarely 4 inches high. Petals small, white, and 

 deeply cleft. Pods on rather long slender pedicels, about 3 lines long, 

 containing numerous minute seeds, on stalks of very unequal length. 

 Erophila vulgaris, D.O. 



On walls, rocks, dry banks, and stony places, throughout Europe and 

 western Asia, except the extreme north. Abundant in Britain. Fl. early 

 spring. Distinguished by some as a genus, under the name of Erophila. 

 An alpine variety with remarkably inflated ovoid-oblong pods (E. inflata, 

 Wats.) occurs on Ben Lawers and Glen Shee in Scotland. [There are 

 three well marked British forms or species : 1. The above-mentioned 

 inflata ; 2. E. brachycarpa, with orbicular-oblong fewer-seeded pods, as 

 long as broad ; 3. E. vulgaris proper, with obovate-oblong pods, twice as 

 long as broad.] 



XV. CAMELINA. CAMELINA. 



Erect and more or less hispid annuals, with sagittate or auricled stem- 

 leaves, and small yellow flowers. Pod obovoid, the partition broad, the 

 valves very convex, with the midrib distinct, the edges flattened, form- 

 ing a narrow margin round the pod. Style slender. Seeds several. 

 The radicle incumbent on the back of one of the cotyledons. 



A genus of two or three European and north Asiatic species, perhaps 

 reducible to one, separated from Cochlearia by their yellow flowers and 

 incumbent radicle. 



1. C. sativa, Crantz (fig. 94). Gold of Pleasure. Stem simple, or 

 slightly branched, 1 to 2 feet high. Lowest leaves stalked, upper ones 

 sessile, clasping the stem with pointed auricles, lanceolate, entire, or 

 toothed, 1 to 2 inches long. Pods about 3 lines long, on pedicels about 

 twice that length, in a long loose raceme. C. fcctida, Bab. 



In cultivated and waste places, in central and southern Europe, and 

 temperate Asia ; further north only as a weed of cultivation. In Britain 

 it occurs in flax-fields in England and Ireland. Fl. with the corn. 



XVI. SUBULAEIA. AWLWORT. 



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 cotyle- 

 dons, not at their junction with the radicle, as in the rest of Crucifers. 



The genus is limited to a single species. 



1. S. aquatica, Linn. (fig. 95). Awlwort. 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 



