Part II. DRABA. 203 



flowers. It is rather a delicate subject, and best adapted for pot 

 culture, or well-drained chinks in rockwork. The true species is 

 somewhat scarce in cultivation. It, like D. trident'ata, is liable 

 to suffer from slugs, and both should be carefully guarded 

 against their attacks, especially during the winter months. 

 Allied to this is Draba aurea, a Danish plant, with flowers 

 produced in a dense corymb, on a leafy stem some eight or nine 

 inches high ; the habit is not neat, otherwise it is a very distinct, 

 well-defined species. 



DRABA CINEREA. — Grey Whitlow-Grass. 



This native of Siberia, frequently called D. borealis, is in my 

 opinion the most effective of the white-flowering Drabas. Of 

 dwarf habit, producing an abundance of clear white flowers in 

 the earliest spring, well relieved by the dark-green leaves, and 

 of a free-growing and permanent character. It should be in 

 every collection. Seeds abundantly, and by tjiat means, as well 

 as by root division, it may readily be increased. 



DRABA CVSPIDAHIA..— Pointed Whitlow-Grass. 



A NATIVE of the highest mountains in Spain, closely allied 

 to D. ciliaris. They both possess many of the characteristics 

 of D. Aizoon, but are more compact in growth, as well as more 

 diminutive. D. cuspidata has the points of each of the ciliated 

 leaves, of which the dense little rosettes are formed, somewhat 

 incurved, and for close examination it is the gem of the yellow 

 Drabas, forming a comparatively thick woody stem. It is only 

 to be increased by means of seed, which it produces but 

 sparingly. My experience in raising the seeds of this plant 

 leads to the conclusion, from the varied forms produced in the 

 offspring, that ciliaris is only a sUght variety of cuspidata, or 

 vice versa. I have, however, not yet succeeded in getting seed 

 from D. ciliaris. 



Draba lapponica, a native, as the name indicates, of the 

 arctic regions, though bearing the aspect of D. rupestris, is 

 dwarfer in habit, and devoid of the ciliated hairs on the leaves ; 

 it forms dense tufts, and flowers freely in early spring, producing 

 an almost equally abundant bloom in the autumn ; it also seeds 

 freely. 



Draba rupestris, frigida, and Chamcejasme, are three very 



