KEY 



3. Leaves four inches to twelve inches wide; flowers large 



white, fragrant. Nymphaacea 



4. Leaves one inch broad or less; flowers small, white. 



Gentianacece (Nymphoides) 



PLANTS HAVING PARALLEL-VEINED LEAVES 



All the leaves from the root or sheathing the base of thi 

 flower-stem. 



1. flowers brown, in cylindrical spikes, which are tw< 



inches or more long. Typhacea 



2. flowers white, with yellow centers. Alismacea 



3. leaves three-divided above; over the flower-spiki 



curves a purple or greenish flap. 



Aracece (Ariscema] 



4. flowers greenish yellow in spikes or "graters." 



Aracece, (Acorus) 



5. leaves in tufts, having prominent central marking 



and cross lines; flowers like pin-cushions, slate 

 colour. Eriocaulaceoe 



6. leaves very narrow; flowers yellow. Xyridacea 

 1. flowers tubular, tawny-orange. 



Liliacece (Hemerocallis) 



8. plant and flowers mealy. Liliacece (Aletris) 



9. flowers pink, having an inflated sack. 



Orchidacece (Cypripedium) 

 10. flowers in twisted spirals, white. 



Orchidacece (Spiranthes) 



Some leaves basal, at least one leaf on the stem. 



1. flowers in parts of 3's and 6's, blue, sometime! 

 variegated with white. Iridacece 



Leaf or leaves on the flower-stem. 



1 . flowers brown-white, in bur-like heads. 



Sparganiacece 



2. leaf lance-shaped, deeply cut at the base; flowen 



blue. Pontederiacecp 



xiv 



