WATER-PLANTAIN FAMILY 5II 



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

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

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

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

 long plant with flowers about J- in. across. — Mountain lakes in the 

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



2. Sagittaria (Arrow-head). — Roots fibrous : leaves erect, 



sagittAria sagittifolia 

 {Common Arrow-head). 



BUTOMUS UMBFXlAtUS 



{Flowering Rush). 



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

 submerged and without the basal lobes ; flowers in whorls, 

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

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

 (Name from the Latin sagitta, an arrow, from the shape of the 

 leaves.) 



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

 species, a pretty plant, easily distinguished by its arrow -shaped 



