26 ANALYTICAL KEY. 



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



exogens. 



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

 Flowers not on a spadix : Distils Several or many : calyx and corolla 



distinctly different . . WATER PLANTAIN F. 454 



.^lowers not on a spadix : pistil only one 



Calyx coherent with the ovary : 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 herhs : flowers more or less irregular, from a sort 



of spathe PICKEREL WEED F. 452 



Terrestrial herbs, not climbing: 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 



