Scientific name: Apium inundatum (L.) Rchb.f.
Common name: Lesser Marshwort
Description
Habit: An aquatic, up to 40 cm long.
Stems: Creeping or floating, hollow, often submerged, sometimes rooting at the nodes.
Leaves: Submerged leaves 3-pinnately divided into hair-like segments; upper leaves pinnate, leaflets 3-lobed or pinnatifid.
Flowers: White, hermaphrodite, in distinctly stalked umbels, with 2-4 rays; bracts absent, bracteoles 3-6; petals 5, free; stamens 5; ovary inferior and 2-celled.
Fruits: A schizocarp, 2.5-3 mm, narrowly ovoid with thick ridges.
Habitat: Lakes, marshes and slow streams.
Distribution: Frequent elsewhere but rare in S. Connemara.
Native status: Native
Of conservation interest: No