82 SUB-ALPINE PLANTS 



Hedges, roadsides, and thickets in the sub-alpine region, local. 

 June to August. 



Distribution. Alps of Savoy and Dauphiny, occasionally in 

 Switzerland (Engadine, etc.), Central and Eastern Europe. 



ERYSIMUM L. 



Erect annuals or perennials, pale or hoary, with closely adpressed 

 hairs, rarely quite glabrous. Leaves entire or slightly toothed. 

 Flowers yellow or rarely white. Pod linear, nearly quadrangular 

 from the prominent midrib of the valves. Stigma broadly capitate, 

 or with short, spreading lobes. Seed ovoid or oblong, the seed-stalk 

 not flattened. 



A rather numerous genus in the northern hemisphere ; differing 

 from Wallflower and Sisymbrium in the seed-pods. 



Erysimum dubium Thellung (E. ochroleucum DC.). 



Root thick. Stem angular,' 9-18 inches high. Leaves linear- 

 lanceolate, entire or slightly toothed. Flowers large, lemon-yellow 

 and then straw-coloured, scented. Sepals dilated at the base, 1-3 

 times longer than the pedicel. Pod compressedly 4-edged. Style 

 3 times width of pod. Stigma 2-lobed. 



Rocky places in the Alps and sub-Alps. May, June. 



Distribution. Jura (Dole, Reculet, etc., not otherwise in 

 Switzerland), Mont Ventoux, Corbieres, Pyrenees, Spanish Penin- 

 sular, Carpathians. 



Erysimum longifolium DC. (E. australe Gay.). 



A greyish green plant, with rootstock sending up erect branches. 

 Stem about a foot high or higher, erect, angular. Leaves linear or 

 linear-lanceolate, entire or sinuate-dentate ; stem-leaves numerous. 

 Flowers fairly large, but smaller than in the last, bright yellow. 

 Sepals 1-2 times longer than the pedicel. Pods erect, spreading. 

 Stigma somewhat thick, obtuse. Calyx hoary, yellowish. Hairs 

 simple, adpressed. 



Rocky places in the mountains. May to August. 



Distribution. S. and S.-E. of France, Alps of Savoy, Southern 

 and Central Europe. 



Erysimum helveticum DC. 



Sometimes considered a variety of the last, with larger flowers 

 and longer pods. Stem usually erect, angular. Leaves narrow, 

 decreasing in width at each end, entire or slightly sinuate-dentate. 

 Pedicels and pods spreading erect, the pods being often 20 times the 

 length of the pedicels. 



Waste and rocky places in the lower mountains. June. 



Distribution. Switzerland (Tessin, Grisons, and Valais), Savoy. 



