A KEY TO THE FAMILIES. 



PAGE 



Leaves mostly compound. Valerianacea 452 



8 stamens, I stigma, 



Flowers; 4 petals, etc., 8 stamens, i stigma, 



Leaves with 3 ribs, stems square. M elastomacece 290 



D. Leaves opposite, toothless. 



Flowers; 5 petals or corolla divisions, 



5 sepals or calyx divisions, 

 5 stamens. 



Commonly 5 corolla lobes, etc. (Trientalis 6 or more), 

 Leaves various, Dodecatheon & Primula radical, obscurely 



toothed, 



Glaux with scales, no leaves. Primulacea 340 



Small bell-shaped corolla, 



Leaves without gloss, milky sap. Apocynacea 364 



Small waxlike flowers in clusters, 



Leaves sometimes circled, milky sap. Asclepiadacea 366 



Corolla genl. funnel-shaped, in 

 Linncea 4 stamens only, 

 Shrubs, vines, etc. Caprifoliacea 446 



Flowers; 5 petals, etc., many stamens. 



2 sepals only, 



Leaves fleshy, in Portulaca scattered & circled. Portulacacea 114 



10 stamens, 



Leaves mostly lance-shaped, stems with swollen joints. 



Caryophyllacea 116 

 Ascyrum with 4 petals only, 

 Leaves genl. translucent-dotted Hypericacece, 268 



Flowers; 4 or more petals or corolla divisions. 



5-7 petals, as many or twice as many stamens, 



Branches square. Lythracea 286 



4 large petaliike white bracts, 4 petals & stamens. 



Leaves ribbed, mostly shrubs. Cornacea 318 



4-12 corolla lobes & stamens, 



Bartonia without leaves. Gentianacece 352 



4 corolla lobes & stamens, 



Leaves small, in Galium circled Rubiacece 440 



Tiny irregular flowers with I or many or no petals, 



Leaves various, sometimes obscurely alt., circled, or toothed. 



Milky acrid sap. Euphorbiacece 246 



4 petals & sepals, 4-8 stamens, 2-4 stigmas, 



Leaves various, some slightly toothed, in CEnothera alternate. 



Onagracece 292 



2-lipped or 4-5 lobed corolla, 2-5 stamens, I style, 

 Leaves various, some alternate Scrophulariacecs 416 



E. Leaves radical; rising or radiating from the root. 



Flowers; 5 petals or corolla divisions, 



5 sepals or calyx divisions 

 5-10 or many stamens. 



Many stamens. Leaves small, set with gland-tipped hairs. 



Droseracece 178 



5 stamens. Leaves genl. heart-shaped, in V. pubescens on 

 stem, not radical. Violacece 276 



5 stamens. Leaves like a pitcher, trumpet, or flaring tube. 



Sarraceniacece 176 

 5-10 stamens. Leaves various, in Chrysosplenium opposite, 



56g 



