General Key to the Families 15 



IV. LYCHNIS. (Tourn.) L. 



1. L. apetala. L. Nodding Pink. 



2. L. Drummondii. (Hook.) Wats. Drummond's 



Pink. 

 V. SILENE. L. 



1. S. Macounii. Wats. White Campion. 



2. S. Lyallii. Wats. Lyall's Catchfly. 



3. S. acaulis. L. Moss Campion. 



XXVII. PORTULACACE.K. PURSLANE FAMILY 



Insipid herbs; leaves entire, succulent, simple; flowers axillary 

 or terminal, essentially regular but unsymmetrical, sepals fewer 

 than the petals ; fruit a capsule. 



I. LEWISIA. Pursh. 



i. L. rediviva. Pursh. Bitter-root. 

 II. OREOBROMA. Howell. Eryth. 



i. O. cotyledon. Howell. Striped Oreobroma. 

 III. CLAYTONIA. (Grdnov.) L. 



1. C. lanceolata. Pursh. Lance-leaved Spring Beauty. 



2. C. megarrhiza. (Gray.) Parry. Alpine Spring 



Beauty. 



3. C. parvi folia. Dougl. Small-leaved Spring Beauty. 



ORDER XVIII. RANUNCULALES 

 XXVIII. NYMPH^ACE^. WATER LILY FAMILY 



Aquatic perennial herbs with horizontal rootstocks; leaves pel- 

 tate or deeply cordate, involute from both margins in the bud, 

 floating or immersed; flowers perfect, axillary, solitary on long 

 peduncles; fruit baccate, with a firm rind. 



I. NYMPH^A. (Tourn.) L. 



i. N. polysepala. (Engelm.) Greene. Yellow Pond 

 Lily. 



XXIX. RANUNCULACE^:. CROWFOOT FAMILY 



Herbs or sometimes woody plants with a colourless usually acrid 

 juice; leaves often dissected, their stalks dilated at the base, some- 



