KEY FOR MARCH, APRIL AND MAY 



356 a Plants usually i ft. or more high; stem leaves present 



Arabis. p 159 

 b Plants i ft. or less high; stem leaves usually absent.. 357 



357 a Basal leaves 1-2 in. long; pods MJ-I in. long 



Stenophragma. p 159 

 b Basal leaves i in. or less long; pods V^-Vz in. long 



Draba. p 159 



358 a Leaves thick and fleshy Sedum ternatum. p 161 



b Leaves not as in a 359 



359 a Leaves rounded-heart-shaped Malva. P 185 



b Leaves obovate to oval 360 



360 a Leaves obovate to oval, all basal 



Saxifraga virginiensis. p 161 

 b Leaves obovate, not all basal Samolus. p 197 



361 a Ovary inferior; flowers in umbels; petals 5; stamens 5362 

 b Ovary superior; flowers not completely as in a 366 



362 a Leaves 3 ; leaflets 3-5 ; umbels at summit of plant 



Panax. p 191 

 b Plants not completely as in a 363 



363 a Ovary covered with coarse hairs or bristles 364 



b Ovary either smooth or covered with fine hairs 365 



364 a Ovary ovoid, covered with hooked bristles 



Sanicula marylandica. p 192 

 b Ovary linear, covered with coarse hairs. W ashingtonia, p 193 



365 a Leaflets ovate, not dissected Chaerophyllum. p 193 



b Leaves finely dissected into linear segments. .Carum. p 193 



366 a When broken, plant exudes a reddish juice; flowers 



white Sanguinaria. p 755 



b Plants not completely as in a 367 



367 a Perianth not differentiated into green calyx and colored 



corolla 368 



b Perianth differentiated into green calyx and colored 



corolla 374 



368 a Flowers reddish, about Vs in. broad; leaves with basal 



lobes Rumex acetosella, p 14.$ 



b Flowers not completely as in a 369 



369 a Flowers about 2 in. broad, borne singly in the axils of 



the 2 umbrella-shaped leaves Podophyllum. p 154. 



b Plants not completely as in a 370 



370 a All leaves basal or wanting at flowering time 371 



b Stem leaves present 372 



371 a Leaves 3-lobed or wanting; flowers subtended by bract- 



like involucre Hepatica. p 153 



b Leaves 3-foliolate Coptis. p 152 



372 a Flowers in compact or elongated racemes or spikes 



Actaea. p 152 

 b Flowers solitary on elongated stalks 373 



25 



