A KEY TO THE FAMILIES. 



PAGE 



Leaves fleshy, various. Crassulacea 180 



Sac-shaped flowers, 3 petals, 3 sepals (one the sac & spur), 



Leaves juicy, stem translucent. Balsaminacece 256 



Compound flowers, nearly all clustered, 



With more or less tubular florets, 



About 20 genera with rayed flowers, 



Leaves sometimes opposite, or radical. Composites 466 



B. Leaves alternate, toothless. 



Flowers; 5 petals or corolla divisions, 



5 sepals or calyx divisions, 

 5 stamens. 



5 ftyles, stem fibrous. Linacea 238 

 Small sharp-pointed leaves, crowded. Diapensiaceoe 340 

 Corolla funnel-formed, 



Arrow-shaped leaves, vines, Cuscuta without leaves. 



Convolvulacea 372 

 Leaves mostly lance-shaped, in Phlox subulata crowded. 



Polemoniacece 374 

 Flowers mostly blue-violet. Boraginacece 376 



Flowers; 5 petals or corolla divisions, 



5 sepals or calyx divisions, 

 5-10 stamens. 



Mostly butterflylike flowers, 4-5 toothed calyx 

 Leaves mostly compound, in 2 species slightly toothed. 



LeguminoscB 208 



Tiny flowers, 3 stigmas, 2 species poisonous, 



Leaves toothed in 2 species of Rhus. Anacardiacece 250 



i style, Chiogenes 4 corolla & calyx lobes, 8 stamens, 

 Leaves often crowded, some opposite. Ericaceae 328 



Flowers; 236 petals, etc. 



6 perianth lobes & stamens, Trillium 3 petals. 



Leaves sometimes radical, or circled. Liliacece 26 



Flowers in Habenaria pouched, 3 petals, the middle one a 



lip 3 colored sepals, a rostellum instead of style, 

 Leaves often radical, in Lister ia opp. Orchidacea 68 



Irregular tubular 3-lobed calyx, 5-12 stamens, 



Leaves large, spreading, in Asarum radical. Aristolochiacecs 98 

 Tiny flowers, no petals, 2-6 calyx lobes, 4-12 stamens, 

 Leaf-stems sheathed, swollen joints. Polygonacea, 102 



3 connected petals, 5 irregular sepals, 2 large & colored, 



6-8 stamens, 



Leaves small, in P. cruciata & verticillata circled. Polygalacea 240 

 3-5 petals, 5 sepals, many stamens, I or no style. Cistacece 274 

 2-3 petals & sepals, 4-6 stamens, 

 Leaves compound. Limnanthacece 232 



C. Leaves opposite, toothed. 



livision. 



sions. 



Flowers; 5 petals or corolla divisions, 



5 sepals or calyx divisions. 

 Many stamens, or only 3-4. 



Flowers a trifle irregular, 4 stamens, 2 long, 2 short, 



Stems square. Verbenacea 384 



Corolla lipped, upper lip 2 lobes, lower 3 lobes, 



Leaves aromatic, stems square. Labiatce 388 



Leaves dissected. Geraniacea 230 



Corolla tubular, 3 stamens only, 



C 68 



