KEY FOR MARCH, APRIL AND MAY 



339 a 5 spurs to each flower; flowers reddish 



Aquilegia canadensis. p 152 

 b 2 spurs to each flower ; flowers whitish .... Bicuculla. p 155 



340 a Leaves simple with entire or toothed, not lobed, margins 341 

 b Leaves compound, dissected, or lobed, or sometimes 



wanting at flowering time 361 



341 a Some or all of leaves opposite or in whorls on the stem 342 

 b All leaves alternate or all basal 350 



342 a Leaves in a single whorl beneath the single white flower 



Syndesmon. p 753 



b Plants not completely as in a 343 



'343 a Flowers with 2 sepals; leaves usually 2, linear, 3-8 in. 



long Claytonia. p 149 



b Plants not completely as in a 344 



344 a Calyx tubular with 4 or more lobes or teeth ; flowers 



pink Silene caroliniana. p 149 



b Calyx with separate sepals, or sepals wanting 345 



345 a Petals 5, deeply notched, appearing like 10 346 



b Petals 5, not deeply notched 347 



346 a Leaves ovate ; styles 3 Alsine media, p 150 



b Leaves oblong to linear, sometimes obovate ; styles 5 



Cerastium. p izo 



347 a Stamens the same number as the sepals Sagina. p 151 



b Stamens twice as many as the sepals 348 



348 a Leaves about ^4 in. long, awl-shaped to ovate 



Arenaria. p 151 

 b Leaves MJ in. or more long 349 



349 a Leaves 1-4 in. long, all basal. .Saxifraga virginiensts. p 161 

 b Leaves %-i in. long, oval to oblong. . . .Moehringia. p 151 



350 a Perianth not differentiated into green calyx and colored 



corolla ; flowers white Unifolium. p 135 



b Perianth differentiated into green calyx and colored 



corolla 351 



351 a Petals 4; sepals 4; stamens usually 6 352 



b Petals 5 or more 358 



352 a Pods or ovaries usually less than twice as long as broad 353 

 b Pods or ovaries elongated, usually more than twice as 



long as broad 354 



353 a Flowers purple, about % in. broad Lunaria. p 160 



b Flowers white, Vz in. or less broad. Roripa armoracia. p 158 



354 a Flowers %-i in. broad, purple or white, fragrant 



Hesperis. p 159 

 b Flowers Vz in. or less broad 355 



355 a Basal leaves usually rounded; root bulbous 



Cardamlne bulbosa. p 159 

 b Basal leaves not rounded 356 



24 



