KEY 



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



white, fragrant. Nymphceacecc. 



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 the 

 flower-stem. 



1; flowers brown, in cylindrical spikes, which are two 

 inches or more long. Typhacece. 



2. flowers white, with yellow centers. Alismacece. 



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



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 markings 



and cross lines; flowers like pin-cushions, slate- 

 colour. Eriocaulacece. 



6. leaves very narrow; flowers yellow. Xyridacece. 



7. 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, sometimes 

 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; flowers 



blue. Pontederiacece. 



