1) Aquatic plant 2) Circumboreal 3) Hydrophyte 4) Hydrophytic plant 5) Subularia aquatica 6) Water plant 
• (n.) A plant (Subularia aquatica), with awl-shaped leaves.
Awl'wort` (al'wûrt`) noun [ Awl + wort .] (Botany) A plant ( Subularia aquatica ), with awl-shaped leaves. 
[n] - small aquatic plant having tufted awl-shaped leaves in a basal rosette and minute white flowers
Subularia aquatica noun small aquatic plant having tufted awl-shaped leaves in a basal rosette and minute white flowers; circumboreal
a small, stemless aquatic plant, Subularia aquatica, of the mustard family, having slender, sharp-pointed leaves and minute white flowers.