Arrowhead - Sagittaria sagittifolia
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Species Description
Widespread and locally frequent in the Southern half of the UK; scarce in the North. Habitat includes: In still or slow-moving calcareous and eutrophic water bodies such as ponds, lakes, rivers, canals, ditches etc. Growing habit: Perennial. Flowers: July to August.
Stace 4:
Sagittaria sagittifolia L. - Arrowhead.
Stems emergent, to 1m; emergent leaves strongly sagittate; floating leaves often elliptic; submerged leaves linear; flowers 2-3cm across; achenes 4-6mm, with beak <1mm; (2n=16, 20, 22). Native; in ponds, canals and slow rivers; frequent in England, very scattered in Wales and Ireland, introduced elsewhere.
Key:
- Most or all emergent leaves strongly sagittate, with two long basal lobes
- Achenes 4-6mm, with apical beak <1mm; petals usually with purple blotch at base; anthers purple