88 THE FLORA OF THE ALPS 



17. EUPHRASIA, L. 



Flowers small, in unilateral bracteate spikes; calyx 

 4-toothed; corolla tubular, 2-lipped, upper lip concave; 

 stamens 4, concealed by the upper lip, anthers hairy; 

 capsule oblong ; leaves opposite, lobed or incised. Small 

 erect herbs, parasitic on roots. 



A. Flowers white, usually dotted or streaked with 

 violet, or dotted with yellow; leaves ovate or ovate- 

 lanceolate, deeply serrate. The species of this section 

 pass into one another, and are very difficult to distin- 

 guish : E. officinalis, L., Eyebright, the English species, 

 common. E. Rostkoviana, Hayne (firatensis, Fr.); 

 flowers larger, corolla streaked with violet, lower lip 

 with a yellow spot; dry banks, common. E. hirtella, 

 Jord. ; flowers smaller, corolla-tube enclosed in the 

 calyx, leaves broad, stem rigid, plant densely hairy; 

 meadows ; Western and Southern Switzerland. E. salts- 

 burgensis, Funke; flowers small, leaves with deeply cut 

 lobes at the base, narrower, glabrous; alpine pastures, 

 frequent. E. versicolor, Kern. ; flowers larger, tube of 

 corolla projecting beyond the calyx-teeth, lower leaves 

 cuneate ; meadows, frequent. E. alpina, Lam. ; flowers 

 large, corolla white, often tinged with violet, stem not 

 more than iJ-2 in., upper leaves broad with spreading 

 teeth ; pastures. E. stricta. Host. ; stem 4-6 in., lobes 

 of lower lip of corolla unequal, with a yellow spot ; mea- 

 dows. E. pulchella, Kern. ; flowers large, lower lip white 

 with yellow spots, upper blue- violet, leaves wedge-shaped, 

 with a few teeth; Tirol. E. montana, Jacq. ; closely 

 resembling officinalis, but stem usually simple, leaves 

 fewer, broader ; damp mountain pastures. 



