26 ANALYTICAL KEY. 



2. Key to those endogens which from their foliage might be mistaken for paob 

 exogens. 

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

 Flowers not on a spadix: nistils several or manv: calyx and corolla 



distinctly different ^ . . . WATER PLANTAIN F. 454 

 .^lowers not on a spadix : pistil only one — 



Calyx coherent ivith the ovary : flowers diiecious 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 fj'om the ovary — 



Aquatic herbs : flowers more or less irregular, from a sort 



of spathe PICKEREL WEED F. 452 



Terrestrial herbs, not climbing: anthers 2-c6lled 



(Trillium, etc.) LILY^ F. 43] 

 Terrestrial and mostly twining shrubs or herbs, with tendrils 



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



