PAM. 17, 18, 19. 27 



the inner sometimes wanting; filaments of stamens dis- 

 tinct or monadelphous; ovary inferior, 1-eellcd. 



1. Flowers duicious; staminate numerous on a spadix enclosed in a 

 spathe, stamens 1-3; pistillate flowers solitary subtended by a 

 spathe. _________ Vallisneria 



V. spiralis, Efl-grass. Acaulescent; leaves lint-shaped, basal; flowers incon- 

 .cuous, the fertile ones borne on a long slender scape, which after ferti- 

 lization coils spirally and submerges the flower. In slow-flowing water. 

 Summer and Fall. 

 1. Flowers dioecious or polygamous, from a spathe; stamens 9 in the sterile 



and 3-0 in the fertile flowers, _ _ _ _ Philotria (Elodea) 



P. (E.) Canadensis, Wuttr thymt, Water-pest. Caulescent; leaves elliptic, 

 opposite or whorled; flowers axillary, dioecious; sterile flowers submerged, 

 "breaking off at maturity and floating on the surface they discharge the 

 pollen near the fertile flowers"; the fertile flowers floating, attached by 

 slender stalks. In slow-flowing water. Spring to Fall. 



17. Hydrocharitaceae, Fr<>ifs-hit Family. 



Aquatic herbs, mostly in still water, with a white perianth 

 of 3 or 6 parts. 



Limnobium Spongia. Floating herb with pendent roots and many stolons; 

 broad, clustered, purplish leaves; monoecious flowers from 2-bracted spathes, the 



e flowers on scapes with 6-12 stamens, monadelphous; fertile flowers on shorter 

 and thicker scapes recurving at maturity, with a 6-9 celled ovary and some abortive 

 stamens; fruit a berry. 



18. Poaceae iGramineae), Grass Family. 



Stems mostly hollow, with 2-ranked leaves, the mar- 

 s of their sheaths not united; fruit a earyopsis or grain. 

 About 45 species in Volusia.) 



19. Cyperaceae, 8edg€ Family. 



Stems rarely hollow, with 3-ranked leaves, the mar- 

 of their sheaths united; fruit an achene (About 40 species.) 



A tall grass on the sand-dunes along the coast is Uniola paniculata or Sea Oats; 

 I'ped sedge often seen along the roadside is Dichromena colorata ileuco- 

 cephala . Cultivated for ornament are Arundo donax, Bambusa argentea and other 

 Bamboo-species; also Cortaderia I 'am pas Grass, Eulalia with lengthwise 



or crosswise stripes, and Cyperus alternifolius, call N but belonging 



to the sedges. Cultivated for on Saccharum officinarum, and Indian 



Corn. Zea Mays, the latter with the following sub-species: everta (pop corn), tunicata 

 (pod corn . indurata (flint corn), saccharata (sweet or sugar corn), etc. The tuber- 

 bearing Cyperus esculentus is known as thuja. As lawn-grasses are used St, Lucie 



uodon dactylon , Bermuda (Capnola dactylon . St. Amu line (Stenotaphrum gla- 



