Class
Order
Rootless, monoecious, submerged aquatic herbs, anchored by specialised branchlets. Stems long, slender, branched. Lvs in whorls of 3–10, dichotomously forked 1–4 times; segments denticulate, bristle-tipped. Fls small, solitary in lf axils. Perianth a single whorl of 8–12 linear segments. Stamens numerous; anthers sessile or subsessile, extrorse. Ovary superior, of 1 carpel with 1 pendulous ovule. Fr. a 1-seeded nut, often with 1–2 spines present at base; style persistent, spinous.
[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]
Category | Number |
---|---|
Exotic: Fully Naturalised | 1 |
Total | 1 |