72 



THE CRUCIFER FAMILY. 



3. Hoary Draba. Draba incana, Linn. (Fig. 89.) 



(Eng. Bot. 1. 388, a luxuriant garden specimen.) 



Nearly allied to the rock JD. t but very 

 different in appearance. Often only a 

 biennial, with the radical leaves spread- 

 ing, and seldom forming branched tufts ; 

 the whole plant hoary with short, single 

 and stellate hairs. Stems erect, 6 inches 

 high or more, with several small, sessile, 

 oblong or lanceolate leaves. Flowers 

 small, and white. Pods 3 to 5 lines long, 

 on short, stiff pedicels, glabrous, or 

 sprinkled with a few stellate hairs ; the 

 valves flat, or the whole pod slightly 

 twisted. 



In rocky situations, in northern and 

 Arctic Europe and Asia, far more com- 

 mon than the rock _D., and descending to lower elevations. Not un- 

 frequent in the Scotch Highlands, and extending into northern Eng- 

 land, north Wales, and northern Ireland. Fl. summer. 



Fig. 89. 



4. Wall Draba. Draba muralis, Linn. (Fig. 90.) 



(Eng. Bot. t. 912.) 



A slender, erect, but weak annual, 

 from a few inches to a foot high, simple 

 or slightly branched, green, but rough 

 with short hairs. Radical leaves spread- 

 ing, ovate or oblong, toothed, \ to 1 inch 

 long. Stem-leaves smaller, ovate, clasp- 

 ing the stem by their cordate or auricled 

 base. Petals white, entire, and very 

 minute. Pods about 2 lines long, on 

 spreading pedicels, in a long slender ra- 

 ceme, each containing about 6 seeds. 



On rocks and walls, in limestone hilly 

 districts, in the greater part of Europe 

 and Russian Asia, from the Mediter- 

 ranean to Scandinavia, and said to extend to the Arctic Circle. In 

 Britain, sparingly scattered over several parts of England and southern 

 Scotland. Fl. spring. 



Fig. 90. 



