WATER-PLANTAIN FAMILY 



5" 



are submerged or floating and pellucid ; flowers in 1 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 \ in. across. — Mountain lakes in the 

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



2. SagittAria (Arrow-head).— Roots fibrous ; leaves erect, 



sagittaria sagittif6lia 

 (Common Arrow-Jiead). 



BUTOMUS UMBF.LLATUS 



(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.) 



1. S. sagittifolia (Common Arrow-head). — The only British 

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



