8o SUB-ALPINE PLANTS 



Draba muralis L. 



Annual. Stem erect, slender, hisped with bifid hairs, leafy. 

 Radical leaves oval, toothed, petioled ; stem-leaves distant, 

 amplexicaul, strongly toothed. Flowers white, very^small, in '& 

 loose spike, with spreading pedicels. Silicule elliptic. 



Walls, rocky and shady places in the plains and hills. April to 

 June. Local. 



Distribution. — Rare in Switzerland (Bile, Martigny, etc.). 

 Almost all Europe ; Western Asia, Canada. British. 



Draba incana L. 



Plant grepsh white, with stellate hairs. Stem erect, very leafy. 

 Leaves entire or toothed ; the root-leaves in a rosette, lanceolate ; 

 stem-leaves oval or lanceolate, sessile. Flowers white, in a long 

 spike. Silicules linear-oblong, on short pedicels, glabrous or 

 pubescent, arranged densely on the axis. 



Stony places and mountain pastures, both in the Alps and sub- 

 Alps. Local in Switzerland. May to July. 



Distribution. — Alps, Pyrenees ; Northern and Central Europe ; 

 Caucasus, Iceland. Asia, N. America. 



Draba verna L. (Erophila vulgaris DC). 



This little annual plant, so well known in England, and so 

 variable, is common in various forms and varieties in Switzerland, 

 and ascends the Alps of Central Europe to the Pine-forest zone at 

 least. February to May. 



Distribution. — Europe, Asia, Africa, N. America. British. 



Kernera Medikus. 



Sepals short, spreading. Flowers small, white. Pods many- 

 seeded. 

 A very small genus scarcely distinct from Cochlearia. 



Kernera saxatilis Reichb. {Cochlearia saxatilis Lam.). 



Stem erect, 6-12 inches high, glabrous like the leaves, or slightly 

 hairy in lowdr parts, usually branched. Root-leaves in a rosette, 

 oblong, obtuse, entire or toothed, slightly hispid ; upper leaves 

 lanceolate, obtuse. Flowers milk-white. Silicules glabrous, oboval. 

 Style very short. Six seeds in two rows. 



Rocks and stony places in the calcareous Alps and lower Alps 

 (e.g. the Sal^ve and Mole) and descending sub-alpine valleys. 

 May to August. 



Distribiition. — Alps, Jura, Cevennes, Corbi^res, Pyrenees, Var, 

 Central and Southern Europe from Spain to Greece. 



