26 ANALYTICAL KEY. 



2. Key to those endogens which from their foliage might he mistaken for page 

 exogens. 

 Flowers spiked on a spadix, and with a prominent spathe ARUM F. 457 

 Flowers not on a soadix : nistils several or many : calyx and corolla 



distinctly different ... AVATER PLANTAIN F. 454 



Flowei-s not on a spadix : pistil only one — 



Calyx coherent loiUi the oi'ary : flowers dioecious or polygamous — 

 Terrestrial plants, twiners : small flowers in racemes, spikes, 



or panicles YAM F. 430 



Aquatic plants : flowers from a spathe . . FROGBIT F. 402 

 Calyx free from the ovary — 



Aquatic herbs : flowers more or less irreg:ular, from a sort 



of spathe PICKEREL WEED F. 452 



Terrestrial herbs, not climbin<i: anthers 2-celled 



(Trillium, etc.) LILY^ F. 431 

 Terrestrial and mostly twining shrubs or herbs, with tendrils 



on the petiole : anthers 1-celled . SMILAX SUBF. 431 



