50 CRUCIFER^E. 



all grow from the roots, and are awl-shaped. The 

 flowers are small, and are sometimes perfected under 

 water. Fl. July. Annual. 



9. DRAB A (Whitlow Grass). 



1. D. verna (Vernal Whitlow Grass). Flower-stalk 

 leafless ; petals deeply cloven ; leaves narrow-pointed, 

 somewhat toothed, hairy. A humble little plant with 

 scanty foliage, and inconspicuous white flowers, but not 

 without interest from its appearing very early in the 

 year ; common on walls and dry banks. A variety is 

 found on Ben Lawers with inflated seed-vessels. Fl. 

 February May. Annual. 



2. D. aizoides (Yellow Alpine Whitlow-grass). 

 Flower- stalk leafless, smooth ; petals notched, twice as 

 long as the calyx ; style much longer than the stamens ; 

 leaves narrow, pointed, rigid, glossy, keeled and fringed. 



DRAB A VEUFA (Vernal IVLltlOW GTttSS). 



On rocks and walls at Pennard Castle near Swansea, 

 where it forms dense tufts, conspicuous with bright 

 yellow flowers. Fl. March, April. Perennial. 



3. D. incdna (Twisted Whitlow-grass). Stem-leaves 

 narrow, toothed, hoary ; petals entire ; pouch twisted. 



