KEY FOR JUNE TO NOVEMBER 



177 a Leaves sessile and prolonged into a more or less sheath- 



ing base 178 



b Leaves not sheathing at the base, sometimes petioled.. 184 



178 a Flowers in dense, cylindrical spikes 2 in. or more long 



and V<2, in. or more in diameter 179 



b Flowers not completely as in a 180 



179 a Spikes terminal on the stem Typha. p no 



b Spikes appearing lateral on the stem Acorus. p 132 



180 a Flowers in racemes; each flower not subtended by bracts 



or arranged in spikelets 181 



b Flowers not completely as in a 182 



181 a Leaves all basal Triglochin. p III 



b Leaves on an elongated stem, not all basal 



Scheuchzeria. p 112 



182 a Perianth present, consisting of 6 parts; flowers in umbels 



or panicles Juncus. p 132 



b Perianth not present; flowers subtended by 1-3 bracts; 

 flowers arranged in spikelets which are variously 

 clustered 183 



183 a Stems usually angular and solid, each flower subtended 



by a single bract Cyperaceae. p 122 



b Stems circular, usually hollow but solid at the nodes; 

 each spikelet usually with 4 or more bracts 



Graminaceae. p 112 



184 a Leaves with onion-like odor A Ilium, p 133 



b Leaves not with onion-like odor 185 



185 a Leaves linear, thick, somewhat 3-angled ; plant grow- 



ing in saline places Dondia. p 14.8 



b Leaves not completely as in a 186 



186 a Leaves all basal; flowers in spikes Plantago. p 213 



b Leaves not all basal 187 



187 a Flowers in panicles 5-12 in. long; flowers Vz-i in. 



broad Melanthium. p 133 



b Flowers not completely as in a 188 



188 a Flowers irregular, each flower with a spur and sub- 



tended by a bract 189 



b Flowers regular, not spurred 190 



189 a Plant with several leaves Perularia. p 138 



b Plant with i conspicuous leaf near the base 



Gymnadeniopsis. p 138 



190 a Perianth 6-parted; fruit with 3 wing-like structures 



Rumex p 145 

 b Perianth 5-parted ; fruit not as in a Polygonum. p 14.6 



191 a Leaves with 3 or more prominent veins and with 



entire margins 192 



b Leaves not completely as in a 202 



38 



