190 THE FLORA OF THE ALPS 



Parl. ; panicle loose, leaves setaceous, rolled-up ; rocky 

 hills. 



32. DACTYLIS, L. 



Spikelets few-flowered ; lowest branch of panicle dis- 

 tant, on a long horizontal stalk. Not alpine. 



D. glomerata, L., Cock's-Foot Grass ; everywhere. 



33. BRIZA, L. 



Spikelets many-flowered, distant, pendulous, on very 

 slender stalks. Not alpine. 



B. media, L., Quaking Grass ; common. 



34. POA, L. 



Spikelets in panicles, few- or many-flowered; flower- 

 ing glumes compressed, keeled ; pale bifid. 



A . Stem thickened at the base like a bulb : P. alpina, 

 L. ; ligules truncate, spikelets often replaced by leafy- 

 buds (viviparous) ; alpine pastures, common. A. bulbosa, 

 L. ; spikelets pubescent, ligules oblong, acute ; waste 

 places. P. concinna, Gaud. ; caespitose, leaves rolled up, 

 panicle dense ; Valais, Piedmont, very rare (Sion, Aosta). 



B. Stem and leaf-sheaths compressed : P. compressa, 

 L. ; root-stock with elongated stolons ; dry banks and 

 walls, common. P. sudetica, Haenk. ; leaves suddenly 

 acuminate and cap-shaped at the apex; alpine pastures, 

 frequent. P. hybrida, Gaud. ; flowers woolly at the base, 

 leaves gradually narrowed ; alpine pastures, local. 



C. Stem and leaf-sheaths nearly cylindrical ; root-stock 

 with elongated stolons : P. pratensis, L. ; meadows, very 

 common. P. distichophylla, Gaud. ; spikelets dark violet; 



