26 ANALYTICAL KEY. 



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



exogens. 



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

 Flowers not on a spadix: pistils several or many: calyx and corolla 



., _ . . . WATER PLANTAIN F 454 



lowers not on a spadix : pistil only one 



Calyx coherent with the ovary : flowers dicecious or polygamous 

 Terrestrial plants, twiners : small flowers in racemes spikes 



or panicles YAM F' 430 



Aquatic plants : flowers from a spathe . FROGBIT F 409 



Calyx free from the ovary 



Aquatic herbs : 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 



