KEY TO FAMILIES xxiii 



r. Stamens 4-5 SAXIFRAGACEAE 191 



s. Stamens 3 PORTULACACEAE 48 



y. Stamens 6 BRASSICACEAE 16 

 z. Stamens more than 6 

 (x) Leaves compound 



m. Style 5-lobed; leaves pinnate LIMNANTHACEAE 37 

 n. Style entire or 2-lobed 



(m) Leaves digitate, of 3-5 leaflets CAPPARIDACEAE 13 



(n) Leaves 2-3-ternate ACTAEA IN RANUN- 



CULACEAE 2 



(y) Leaves simple 



m. Sepals 2 ; leaves fleshy PORTULACACEAE 48 



n. Sepals 4-5 ; leaves not fleshy 

 (m) Shrubs 

 r. Flowers white 



(r) Leaves alternate, evergreen LEDUM IN ERICA- 

 CEAE 86 



(s) Leaves opposite, not ever- 

 green SAXIFRAGACEAE 191 

 s. Flowers purplish-yellow ; leaves 



linear, strong-scented THAMNOSMA IN 



RUTACEAE 40 

 (n) Herbs 

 r. Pistils superior 



(r) Stamens 8 SAXIFRAGACEAE 191 



(s) Stamens many PAPAVERACEAE 9 



s. Pistil inferior; stamens 8 ONAGRACEAE 199 



(b) Flowers irregular 

 x. Flowers spurred or hooded; leaves 



deeply cut or compound 



(x) Stamens many; pistils 2-3 RANUNCULACEAE 1 



(y) Stamens 6 ; pistil 1 FUMARIACEAE 12 



y. Flowers not spurred; leaves simple ONAGRACEAE 199 

 (3) Petals 5 or more 

 (a) Flowers regular 

 x. Pistils simple, 1-many 

 (x) Pistils few-many 

 m. Stamens and petals coming off with 



the calyx ROSACEAE 150 



