PRIMULACE^ 51 



pink with yellow centre, nearly sessile, plant densely 

 caespitose, leaves very small, blunt, pubescent ; high, 

 clefts of rocks. A. glacialis, Hoppe; flowers red, rarely 

 white, stalked, corolla-lobes entire, plant caespitose, leaves 

 lanceolate, blunt, hairy ; very high ; Switzerland, Styria. 

 A. pubescenSy DC. ; flowers white with yellow centre, 

 leaves lanceolate, acute, hairy; Switzerland, Dauphiny, 

 Pyrenees, rare. A, Charpentieriy Heer ; flowers pink, on 

 long stalks, corolla-lobes incised, plant caespitose, leaves 

 spathulate, blunt, hairy; very rare; Valais, Ticino. A. 

 pyrenaicay Lam. ; flowers white, on long stalks, with 2-3 

 lanceolate bracts, calyx pubescent, leaves lanceolate, 

 keeled ; Pyrenees. A. cylindrica, DC. ; flowers small, 

 white, on long hairy stalks, leaves in dense cylindrical 

 rosettes, linear-lanceolate, hairy; Pyrenees. 



2. Primula, L. 



Flowers in umbels surrounded by an involucre of 

 bracts, rarely solitary, pink, violet, yellow, or white ; 

 stem always leafless ; calyx 5 -toothed ; corolla funnel- or 

 saucer-shaped, 5-lobed ; stamens 5, epipetalous ; ovary 

 nearly globular, style filiform, stigma capitate ; seed- 

 vessel a 5-valved capsule. Many species of Primula dis- 

 play marked dimorphism or heterostyly — that is, some 

 flowers have shorter and some longer st3des; in the 

 former, the nearly sessile anthers are placed in the throat 

 of the corolla, nearly level with the stigma in the other 

 form ; in the latter, the anthers are fixed half-way down 

 the corolla-tube, and again nearly level with the stigma 

 in the other form. Since the flowers in the same plant 

 are always all of one kind, this promotes cross-fertilisation 



