20 THE FLORA OF THE ALPS 



flowers yellowish-white, stem-leaves in whorls of three ; 

 Tirol. D. digitata, Lam. ; flowers pink or lilac, leaves 

 alternate, lower with 3, upper with 5 segments ; Switzer- 

 land, Tirol, Pyrenees. D. alternifolia, Hausm. ; flowers 

 yellowish-white, leaves alternate, with 3 segments ; Tirol, 

 Styria. D. intermedia, Sond. ; flowers lilac or white, 

 leaves with 5 segments ; Southern Tirol, rare. D. bulbi- 

 fera, L., Coralwort; flowers lilac or white, lower leaves 

 pinnatifid, upper undivided, with axillary bulbs ; Switzer- 

 land, Dauphiny. D. polyphylla, W. & K. ; flowers 

 yellowish-white, 7-14, all the leaves pinnatifid; rare; 

 Switzerland, Carinthia. D. pinnata, Lam. ; flowers white 

 or lilac, 3-7, all the leaves pinnatifid; Switzerland, 

 Pyrenees. 



Tribe SlSYMBRIE^E. Seed-vessel elongated, seeds 

 usually in one row ; radicle incumbent, straight, plano- 

 convex; flowers white, yellow, or lilac. Genera 8-12. 



8. SlSYMBRIUM, L. 



Plant glabrous or with simple spreading hairs ; leaves 

 usually toothed or pinnatifid; flowers in loose racemes, 

 usually yellow. Not alpine. 



The following British species occur in corresponding 

 situations in Switzerland : S. Thaliana, Koch, with 

 very small white, and 5. Alliaria, Scop., Jack-by-the- 

 hedge, Sauce-alone, with larger white flowers ; S. offi- 

 cinale, Scop., Hedge Mustard, with very small yellow, 

 and 5. Irio, L., and 5. Sophia, L., with larger yellow 

 flowers. Also the following in Southern Switzerland : 

 Flowers yellow : 5. austriacum, Jacq., leaves runcinate ; 



