PRIMULACE 59 
g. CENTUNCULUS, L. 
Flowers minute, solitary, axillary; calyx-teeth, corolla- 
lobes, and stamens each 4-5; leaves usually opposite ; 
capsule splitting horizontally. Not alpine. 
C. minimus, L.; a very small plant with minute white 
or pink flowers, and small ovate glabrous sessile leaves ; 
wet places, rare; Switzerland, Jura, Pyrenees. 
10. TRIENTALIS, L. 
Flowers solitary, white, on slender erect flower-stalks ; 
calyx-teeth, corolla-lobes and stamens each 5-9; leaves 
in whorls of 5-7; capsule splitting into five valves. 
T. europea, L. (Fig. 82); flowers 1-4, from a whorl of 
5-7 leaves, calyx-teeth linear, leaves ovate, shining; sub- 
alpine heaths; very rare; Switzerland, Southern Tirol, 
Carniola, Pyrenees. 
II. SAMOLUS, Tourn. 
Flowers small, white, in terminal racemes or corymbs ; 
stamens 5; ovary 4-inferior ; seed-vessel a 5-valved cap- 
sule. Not alpine. 
S. Valerandi, L., Brookweed; stem partially prostrate, 
leaves obovate, entire, mostly alternate; wet places, rare; 
Valais, Jura, Vosges, Pyrenees. 
Order LII].—APOCYNACE. 
Flowers regular; calyx usually 5-toothed; corolla 
usually 5-lobed, lobes oblique, contorted in bud; stamens 
usually 5; ovary 2-celled; seed-vessel usually of two many- 
