284 



THE FLORA. 



eOHOET VI. 



riiORlDIiE, OB THE FLO"WIiRING ENDOGENS. 



Obder CXXXV. ALISMACE^. Alismads. 



Herbs growing in water, with the leaves parallel-veined, and with the 

 flowers regular and not on a spadix ; the perianth consisting of 

 sepals and petals, 3 of each, the former always green ; 

 ovaries free, 3 or more, separating into as many- 1-seeded achenia. 



Analysis of the Genera. 



Lvs. 



§ Both the calyx and corolla greenish. 



rush-like {Arrow-grasses) b 



§ Corolla colored, white. Leaves mostly 



with a lamina a 



a Fls. 5 . Sta. 6. Carpels whorled. 



Water Plantain. Alisma. 1 

 a Fls. 5 . Stamens 9-24. Carpels in a 

 head. Schinodore. Echinodorus. 

 Sta. many. Carpels in a 

 Arrow-head. Saoittabia. 2 

 Anthers ovate. Carpels 

 I'l-igloch. TmQLooHnr. 

 b Leaves cauline. Anthers linear. Car- 

 pels 1-2-seeded. Scheuohzeria. 



^Fls. S- 



head. 



b Lvs. radical. 



1-seeded. 



1. ALISMA. Water Plantain. 



Flowers perfect. Stamens 6. Ova- 

 ries and styles nnmerous, collected into 

 a whorl, becoming in fruit many dis- 

 tinct, flattened achenia. — li Stemless 

 herbs, tlie leaves all radical. Mowers 

 in a panicle. 



A. planta'go. A common, smooth, handsome 

 inhabitant of ponds and ditches. Leaves 

 oval or ovate, abruptly acuminate, 7-9- 



Fig. 643. Sagittaria Bagittifolla (com- 

 mon forjn), leaf and flowers. 4. One 

 of tbe pistils enlarged. 5. The pistil of 

 Alisma out open, showing the seed and 

 curved embryo. 



