I90 THE FLORA OF THE ALPS 



Pari.; panicle loose, leaves setaceous, roUed-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. mediuy 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, alpinay 

 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. compressuy 

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

 walls, common. P. sudeticay 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. distichopkylla, Gaud. ; spikelets dark violet; 



