1 | Calyx 4-merous; perennial |
1' | Calyx 5-merous; annual or biennial, occassionally perennating |
2 | Calyx densely hispidulous with long, spreading, frequently hooked hairs; plants grey-green in appearance; sepals unequal; stamens usually 2 |
2' | Calyx without hooked hairs; plants not grey-green, sepals subequal; stamens 2-5 |
3 | Plants bright pale green; leaves turning reddish with age; flowers c. 1 mm long; calyx thinly and rather unevenly pilose; stamens usually 2-3; seeds smooth |
3' | Plants dark bluish-green; leaves not often turning reddish with age; flowers c. 0.7 mm long; calyx rather densely and uniformly pilose; stamens 5; seeds shagreened |