KEY FOR JUNE TO NOVEMBER 



127 a Ovary inferior Vaccinium. p 196 



b Ovary superior 128 



128 a Flowers about ^4 in. long, in dense i -sided racemes 



Leucothoe racemosa. p 195 

 b Flowers about % in. long, in lateral umbels. .Pieris. P 195 



Parasitic Herbs Without Green Leaves or Green Stems 



129 a Parasitic plants not with green leaves or green stems. . 130 

 b Plants with green leaves and green stems 136 



130 a Stems twining about other plants and parasitic upon 



them Cuscuta. p 201 



b Plants not twining about other plants 131 



131 a Plants with a single terminal flower on the stem .... 132 

 b Plants with more than one flower on the stem 133 



132 a Flowers regular, often nodding Monotropa. p 195 



b Flowers irregular, more or less erect Thalesia. p 212 



133 a Flowers arranged in panicles Leptamnium. p 212 



b Flowers arranged in a single terminal spike 134 



134 a Flowers regular Hypopitys.* p 195 



b Flowers irregular 135 



135 a Ovary inferior; roots coral-like Corallorhiza. p 139 



b Ovary superior Conopholis. p 212 



Herbs Growing Floating or Submerged in Water 



136 a Plants growing submerged or floating in water 137 



b Plants not growing submerged or floating in water but 



sometimes in very wet places 167 



137 a Plants not with true stems and leaves 138 



b Plants with stems and leaves 140 



138 a Plants more or less globose, without rootlets. . Wolffia. p 132 

 b Plant flattened, with rootlets 139 



139 a Plant 5-15 veined, with several rootlets beneath 



Spirodela. p 132 



b Plant 1-5 veined with i rootlet beneath or with i root- 

 let to each lobe Lemna. p 132 



140 a Plants with air-bladders attached to the stems or leaves 



Utricularia. p 212 

 b Plants not with air-bladders attached to stem or leaves 141 



141 a Stem divided into thread-like strands; leaves scarcely 



differentiated from the stem Podostemon. p 160 



b Plants not completely as in a 142 



142 a Some or all of leaves dissected or pinnatifid 143 



b Leaves not dissected or pinnatifid 148 



143 a Flowers white, in whorls on hollow, inflated stalks 



Hottonia. p 197 

 b Plants not completely as in a 144 



35 



