WATER-PLANTAIN FAMIJA' 



511 



are submerged or floating and pellucid ; flowers in i or 2 uniijelkte 

 whorls, larger than in the last ; carpels in a globose head. — 

 Peaty bogs ; not uncommon. — Fl. May — September. Perennial. 

 3- .-I. luitaits (Floating Water-Plantain). — A slender, often very 

 long plant with flowers about I in. across. — Jvlountain lakes in the 

 West ; rare. — Fl. July, August. Perennial. 



Sagittaria (Arrow-head). — Rouls fibrous ; leaves 



erect, 



SAGITT.^RIA SAGITTIF('>LI,\ 



{Common Amyu-'-Jicaii). 



BUTOMUS rr.IBF.I.I..<Tl-S 

 (^Fl^us''iti^ Rush). 



arrow-shaped, the basal lobes directed downwards or tioating, or 

 submerged and without the basal lobes : ^flou-ers in whorls, 

 moncecious, the upper ones larger and staminate ; stamens indefi- 

 nite ; carpels numerous, free, i-seeded, indehiscent, in a head. 

 (Name from the Latin sagitia. an arrow, from the shape of the 

 leaves.) 



I. S. sagtttifolia (Common Arrow-head). — The only British 

 species, a pretty plant, easily distinguished by its arrow -?haped 



