1 64 THE FLORA OF THE ALPS 



B. Flowers sessile, in nearly hemispherical heads : 

 P. Scheuchzeri, All. (Charmelii, Vill.) ; flowers lilac, bracts 

 of involucre linear, much longer than the inflorescence, 

 stigmas 2, stem slender, 12- 1 8 in., radical leaves linear, 

 crenate or serrate, on long stalks, sometimes cordate, 

 stem-leaves linear ; alpine, rocky. C. pauciflorum, L. (PI 

 57) ; flowers blue, 5-7 in each capitule, stem 2-3 in., invo- 

 lucral bracts oval, blunt, leaves obovate-lanceolate, slightly 

 crenate; alpine pastures, frequent. P. humile, Schleich. 

 (PI. 58) ; flowers violet, ten or more in an inflorescence, 

 bracts nearly as long as flowers, ovate-lanceolate, usually 

 dentate, stem 2-4 in., leaves linear, ciliate, calyx often 

 coloured ; very high ; Southern Switzerland, Tirol, Pied- 

 mont, Carinthia, Salzburg, rare. P. hemispharicum, L. ; 

 flowers blue, elongated, inflorescence about lo-flowered, 

 bracts acuminate, about half as long as flowers, stem 

 2-4 in., leaves linear, glabrous; very high, local. P. lati- 



folium, Heuff. (confusum, Kern.); resembling the last, but 

 Lracts acute or obtuse, not acuminate, leaves spathulate, 

 slightly crenate ; very high ; Carinthia, Styria. P. Sieberi, 

 Spreng. ; flowers violet, inflorescence rather longer, bracts 

 ovate, apiculate, serrate, stem 2-6 in., leaves ovate-lanceo- 

 late, crenate ; very high ; Tirol, Styria, Carniola, Carinthia. 

 P. orbiculare, L. ; flowers blue, stigmas 3, exserted, 

 bracts lanceolate, serrate, stem 612 in., often hollow, 

 leaves very variable in width, crenate-serrate ; pastures, 

 common. 



C. Flowers sessile, numerous, in elliptical or cylindri- 

 cal spikes : P. spicatum, L. ; flowers yellowish-white or 

 rarely blue, stigmas 2, exserted, stem 1-2 ft., leaves 

 cordate -ovate, often spotted with brown; woods and 

 thickets, frequent. P. Halleri, All.; flowers dark blue 



