HYDROCHARITACEAE— ARACEAE 

 Butomus 



(Or. bou», iix, tomus, cut, from 

 A ngle European species sometimes cultivated />'. umbelldtus 



I [ydrocleis^-Water-poppy 



(Or. hydro-, water, klels, k'y> 

 A single tropical species; often cultivated; plant floating; flowers large, 



yellow //. nymph6ides 



Hydrales Water Weed Order 



Hydrocharitaceae — Water-weed Family 



Submerged or floating aquatic herbs; sepals 3, petals .> or 0, stamens 2 \2 or 0, pistil or 1, 

 3-9-parted, ovary l-9-celledj flower syncarpous, apopetalous, apetalous or sympetalous, epigynous, 

 regular, usually dioecious. 



1. Stems elongated, branched; leaves small, in whorls of .i ; Sowers with a 



thread like tube I'hilotria 



2 Stems undeveloped; leaves long, grass like Vallisneria 



1 'hilotria — Water-weed 

 (Gr. philos, loving, tria, three) 

 Small native submerged aquatic, often cultivated in aquaria; pistillate flow- 

 ers with a long, thread like perianth-tube /'. canadensis 



Vallisneria — Eel-grass 



(Named for Vallisneri, an Italian botanist) 

 Submerged grass like aquatic; pistillate flowers on long coiled stalks /'. spiralis 



Arales Arum Order 



Araceae — Arum Family 



li rbs, or somewhat shrubby, with flowers in a dense fleshy spike (spadix) which is subtended 

 or surrounded by a spathe ; sepals 4-6 or 0, petals 0, stamens 4-7, ovary 1-celled ; flowers syncar- 

 pous, apetalous, ovary sunk in the fleshy axis. The autumn- and winter-flowering forms are all culti- 

 vated greenhouse plants. 



1. Spadix covered with flowers to the tip 



a. Stem thick, elongated ; leaves perforated Monslera 



b. Stem not appearing above ground; spathe expanded, white '/.antedeschia 

 2 End of spadix without flowers 



a. Spathe hood-like; leaves simple, entire Arum 



b. Spathe expanded, ill-smelling, preceding the large compound leaf Amorphophallus 



Monstera 

 (Of uncertain origin) 



Half-climbing plant with aerial roots and edible fruit .1/. deluiosa. 



Zantedeschia — Calla 



(Named for Zantedeschi, an Italian botanist) 

 Commonly cultivated plant with arrow-shaped leaves and large white spathes 



on long stalks Z. acthiopica 



Arum 



(The Greek name) 

 Flowers on lower part of spadix, the staminate and pistillate flowers sep- 

 arated by fringe-like sterile flowers .'. itaiuum 



Amorphophallus 



Flowers on lower part of spadix; spathe brownish, bad smelling A. Rivieri 



