KEY FOR MARCH, APRIL AND MAY 



170 a Leaves grass-like, linear, usually % in. or less broad, 



i in. or more long 171 



b Leaves not completely as in a 179 



171 a Flowers in spikes 172 



b Flowers in terminal panicles or umbels 174 



172 a Spike about ^4 in. long, solitary at the end of the 



flowering stalk Eleocharis. p 124. 



b Spikes not completely as in a 173 



173 a Spike 1-3 in. long, somewhat flattened, the spikelets 



stalked; leaves fragrant when drying. Anthoxanthum. p 120 

 b Spikes not completely as in a Carex. p 125 



174 a Leaves hairy; flowers in terminal umbels. Juncoides. p 133 

 b Leaves not hairy 175 



175 a Flowers in top-shaped heads, arranged in terminal 



umbels Juncus. p 132 



b Flowers not in top-shaped heads; spikelets arranged 



in panicles 176 



176 a Spikelets of panicle each with several awns about Vi 



in. long Bromus tectorum. p 120 



b Spikelets of panicle not completely as in a 177 



177 a Outer scales of spikelets shining; grass fragrant 



Savastana. p 121 

 b Outer scales of spikelets not shining, grasses not fragrant 178 



178 a Spikelet i-flowered, comparatively broad, blunt at apex 



Oryzopsis. p 120 

 b Spikelet 2-6-flowered, tapering to apex Poa. p 122 



179 a Flowers arranged compactly on a spadix which is sur- 



rounded or subtended by a leaf-like, often colored 



spathe 180 



b Flowers not arranged completely as in a 182 



1 80 a Spathe white, subtending but not surrounding the spadix 



Calla. p!3i 

 b Spathe surrounding the spadix 181 



181 a Leaves compound, with 3 leaflets Arisaema. p 131 



b Leaves simple, arrow-shaped Peltandra. p 131 



182 a Flowers in a compact spike which appears lateral on 



a flattened flowering stalk ; leaves sword-shaped 



A corns, p 132 

 b Plants not completely as in a 183 



183 a Flowers arranged in globose heads MJ in. or more in 



diameter; leaves usually i ft. or more long, linear 



Sparganium. p no 

 b Plants not completely as in a 184 



184 a Leaves in i or 2 whorls on an upright stem; leaves 



1-4 in. long, ovate to lanceolate Medeola. p 136 



b Plants not completely as in a 185 



