Eleocharis quinqueflora

Few-flowered Spike-rush


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Eleocharis quinqueflora, Glen Fender Meadows SAC, Blair Atholl, July 2010

Overview
  • a slight and slender plant (more slender than the four larger species except some smaller uniglumis);
  • +/- tufted (uniglumis is patch-forming)
  • spikelets small, short, and few-flowered;
  • lowest glume encloses spikelet (like uniglumis), and often half as long as spikelet (uniglumis shorter, rounder, less elongated);
  • stigma 3-forked (as in multicaulis and the two smaller species; contrast uniglumis and larger species, 2-forked);
  • ripe nut has style-base not swollen (rules out all larger species; very distinct from uniglumis);
  • springs, seepages, with some mineral influence, especially upland (uniglumis sometimes in this habitat); rarely emergent from water: contrast with acicularis (silt/sand in +/- still water, often submerged, mainly lowland) and parvula (very local, estuary mud only).

Growth & size

~ tightly or loosely tufted;
~ when
newly emerged, inconspicuous: short glaucous stems with dark heads;
~ can look like
Carex dioica, which is however an earlier developer, has leaf-blades, and a longer, paler, spikelet (below).


newly emerged E. quinqueflora stems in flower


(five stems on left) Eleocharis quinqueflora;
(four stems on right) male and female Carex dioica from the same site, same time

~ also like stunted forms of deergrasses Trichophorum even very short and weak T. germanicum! note deergrasses have the short leaf-blade on the upper leaf-sheath (below).



Leaf-blade of upper sheath in Trichophorum species


Very stunted Trichophorum germanicum!; note small leaf blades on upper sheaths (compare E. quinqueflora picture below)


~ up to 20 cm when mature, similar to
uniglumis (which has spikelets much longer than basal glume and very different nut/style-base characters).



E. quinqueflora: late-season stems

Spikelets
~ short, few-flowered; ovoid or rhomboid;
~ lowest glume about half as long as the spikelet (but variable), and encloses its base.

Some spikelets may have a lowest glume shorter than half spikelet length, and suggest
uniglumis. In immature plants check stigmas (3-forked here; 2-forked in uniglumis), and if mature, check nuts (slender style-base and no 'neck' here; obvious 'neck' below swollen style-base in uniglumis) - see section below. Quinqueflora tufted; uniglumis patch-forming.


spikelets in flower, showing basal glumes close to half length of spikelets


spikelets in fruit


Flowers
~ stigma 3-forked
~ perianth bristles 4-6 (but not significant for identification)

Nuts
~ style-base (stylopodium) is not swollen
~ style-base runs down smoothly into nut, with
no constriction (‘neck’)


nuts

style-base not enlarged, runs smoothly into nut
(yes – I know the stigma appears 2-forked here: I think two of the threads are confluent)


Habitat
~ mires, especially open seepages with at least a modicum of base.


Glen Fender Meadows SAC, Blair Atholl (Highland): quinqueflora with Saxifraga aizoides, Triglochin palustris,
Eriophorum angustifolium and latifolium, Carex dioica, etc. (July 2010)


Frequency & range
~ very frequent in more hilly areas of north and west. See distribution map.

Links to the other Eleocharis spike-rush pages (also accessible from the sidebar)