KEY FOR MARCH, APRIL AND MAY 



185 a Leaves all basal 186 



b Leaves not all basal 187 



1 86 a Flowers very small in a terminal compact spike 



Plantago. p 213 

 b Flowers Ms -94 in. broad, irregular, in a raceme 



Leptorchis. p 139 



187 a Plants prostrate on the ground 188 



b Plants more or less erect 189 



188 a Leaves ovate or rounded, short-petioled ; anthers orange- 



red Chrysosplenium. p 161 



b Leaves awl-shaped, not petioled Scleranthus. p 151 



189 a When cut or broken, the plant exudes a milky juice.. 190 

 b Plants without a milky juice 191 



190 a Leaves 2-5 in. long, 1-3 in. broad; flowers in umbels 



Asdepias. p 200 



b Plants not completely as in a Euphorbia, p 180 



191 a Leaves compound, the leaflets sometimes petioled. ... 192 

 b Leaves simple 196 



192 a Leaves palmately compound; leaflets 3-11, 1-4 in. long 193 

 b Leaves not completely as in a 194 



193 a Flowers 1-3 in. broad Helleborus. p 152 



b Flowers % in. or less broad .. Sanicula marylandica. p 192 



194 a Leaflets 2-4 in. long, toothed Aralia. p IQO 



b Leaflets %-2 in. long, somewhat lobed toward apex.. 195 



195 a Flowers perfect; sepals 6; petals 6; stamens 6 



Caulophyllum. p 154 

 b Flowers imperfect; perianth 4 or 5 parted; stamens 



numerous Thalictrum. p 154. 



196 a Leaves mostly basal, 4-10 in. long, oblanceolate ; flowers 



in a panicle Saxifraga pennsylvanica. p 161 



b Plants not completely as in a 197 



197 a Leaves with toothed, lobed, or wavy margins 198 



b Leaves with entire margins 199 



198 a Leaves rounded, with 7-9 rounded lobes. .Heuchera. p l6l 

 b Leaves not rounded Rumex. p 145 



199 a Leaves ovate, 3-12 in. long, not all basal; flowers Vz-i 



in. broad Veratrum. p 133 



b Plants not completely as in a 200 



200 a Leaf-like branches narrowly linear ; leaves scale-like ; 



flowers about ^4 in. long Asparagus, p 135 



b Plants not completely as in a 201 



201 a Leaves 3-4, basal, 4-8 in. long; flowers Vi-\ in. long 



Clintonia. p 135 

 b Plants not completely as in a 202 



202 a Plant with tendrils; flowers with disagreeable odor 



Smilax herbacea. p 136 

 b Plants not with tendrils 203 



15 



