52 THE FLORA OF THE ALPS 
by the agency of insects, the pollen of the long-styled 
plants being deposited on the stigma of the short-styled 
plants, and vwice verséd. Other examples of a similar 
heterostyly are presented by Oxalis, Lythrum, and Pul- 
monarta. Several of the yellow- flowered species of 
Primula are familiar meadow or hedge-row plants; all 
the rest are more or less alpine, and are especially char- 
acteristic of the range south of the Rhone Valley; the 
number of species in Northern Switzerland being com- 
paratively small, and in the Pyrenees still smaller. 
A. Flowers yellow :—P. vulgaris, Huds. (acaulzs, L.), 
Primrose; common. P. verds (officinalis, Jacq.), Cowslip, 
Paigle; frequent. /. elatzor, Jacq., Oxlip; distinguished 
by the open throat of the corolla, and the flowers being 
rather larger and paler than those of the Cowslip; very 
local in England, much the more common on the Conti- 
nent. P. Auricula, L., the Auricula; flowers fragrant, 
leaves glabrous, upper side of the leaves, leaf-stalk, calyx, 
and throat of the corolla covered with white meal; local; 
Switzerland, Jura, Dauphiny, Pyrenees, Carpathians. PP. 
Balbisiz, Lehm.; flowers scentless, leaves with a few 
glandular hairs, calyx usually not mealy; Tirol, very 
rare (Monte Baldo). 
B. Flowers red or violet, rarely white; leaves mealy 
beneath or on the margin:—P. farinosa, L. (PI. 71), 
Bird’s-eye Primrose; corolla-tube somewhat longer than 
calyx, calyx-teeth ovate, scape 2-6 in.; damp meadows; 
one of the commonest and prettiest of the sub-alpine 
plants. P. longifiora, All. (Pl. 72); flowers much 
larger, corolla-tube three times as long as corolla, calyx- 
teeth lanceolate; alpine pastures; local. P. venusta, 
Host. ; calyx and throat of corolla mealy, leaves obovate, 
