Natural Communities of NH -- Photo Guide

Spike-rush - floating-leaved aquatic mudflat marsh  (S1)

Spike-rush - floating-leaved aquatic mudflat marsh
is restricted to closed basins of southern and central parts of New Hampshire. It is wetter than, and occupies lower ground adjacent to, the three-way sedge - mannagrass mudflat marsh. It is intermittently exposed, and characterized by fewer tall graminoids than the previous community, and more floating and submersed aquatic species.

Characteristic vegetation:
Perennial, short rhizomatous species include olive-brown spike-rush (Eleocharis flavescens), Small’s spike-rush (E. smallii), least spike-rush (E. acicularis), mud rush (Juncus pelocarpus), Torrey’s threesquare (Scirpus torreyi), northern St. John’s-wort (Hypericum boreale), golden-pert (Gratiola aurea), and mild water pepper (Polygonum hydropiperoides). The floating-stemmed graminoid northern floating mannagrass (Glyceria borealis) is occasional.

Characteristic mudflat annuals include frequent blunt spike-rush (Eleocharis obtusa) and Smith’s bulrush (Scirpus smithii), and occasional Tuckerman’s panic-grass (Panicum tuckermanii), swamp beggar-ticks (Bidens connata), stiff panic-grass (Panicum rigidulum), ovoid spike-rush (Eleocharis ovata), small bidens (Bidens discoidea), and fireweed (Erechtites hieracifolia). Floating-leaved aquatics include variegated yellow pond-lily (Nuphar variegata), Oakes’ pondweed (Potamogeton oakesianus), and common snailseed pondweed (P. diversifolius). Other aquatics are also occasional, including low water-milfoil (Myriophyllum humile) and inflated bladderwort (Utricularia radiata). Aerenchymatous species include lesser bur-reed (Sparganium americanum). Pipewort (Eriocaulon aquaticum) is occasional.

Good examples of this community occur in Hollis and Litchfield.

Spike-rush - floating-leaved aquatic mudflat marsh often occurs as part of a sand plain basin marsh system.

(no photo available)

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