Eleocharis suksdorfiana

Beauverd

Bull. Soc. Bot. Genève 13: 267. 1922.

IllustratedEndemic
Synonyms: Eleocharis paucifora var. suksdorfiana (Beauverd) Hultén Eleocharis quinqueflora var. suksdorfiana (Beauverd) J. T. Howell
Treatment appears in FNA Volume 23. Treatment on page 115. Mentioned on page 90, 112, 113, 114.

Plants perennial; rhizomes 0.5–1.5 mm thick, scales persistent, 5–10 mm, thinly membranous, not fibrous; resting buds absent (non-resting buds on rhizome apex ellipsoid, 10 × 2–5 mm); caudices present, hard, 2 mm thick. Culms erect, not spirally twisted, not contracted near spikelet, when dry usually with several blunt to acute ridges and sulcate, subterete to slightly compressed, to 2 times as wide as thick, (5–) 10–40 cm × 0.5–1.2 mm, firm to hard, finely many-ridged at 10–20X; culm tufts not proximally bulbous. Leaves: distal leaf-sheaths stramineous to brown or reddish proximally, green to stramineous distally, subtruncate to obtuse, membranous to papery; apex brown to red. Spikelets 5–10 × 2–4 mm; proximal scale usually empty, 3–5 mm, usually 1/2 or more as long as spikelet; floral scales 8–12 per spikelet, lanceolate (to ovate), 3.5–5 × 2–2.5 mm. Flowers: perianth bristles 6, equal, the longest equaling achene to exceeding tubercle, very slender, spinules dense; anthers 1.6–3.5 mm. Achenes medium brown to gray or dark-brown, equilaterally trigonous to compressed trigonous, rarely some biconvex, 2–2.7 × 0.7–1.3 mm, apex tapered to a distinct stramineous beak 0.2–0.9 × 0.3–0.6 mm. Tubercles 0.4–0.5 × 0.3–0.5 mm.


Phenology: Fruiting late spring–summer.
Habitat: Bogs, fens, wet meadows, springs, wet gravel near ponds
Elevation: (0–)1100–3300 m

Distribution

V23 174-distribution-map.jpg

Alta., B.C., Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash.

Discussion

Although Eleocharis suksdorfiana is usually included in E. quinqueflora, it clearly differs qualitatively as given in the key. A collection from hot springs in Ruby Valley, Elko County, Nevada, has stout perianth bristles less than half of the achene length and may represent an undescribed taxon related to E. suksdorfiana. Eleocharis suksdorfiana closely resembles E. rostellata in its achenes, tubercles, culms, and caudices; it differs in the presence of long horizontal rhizomes and the absence of stoloniferous culms. The achenes of E. suksdorfiana are often finely longitudinally ridged, but in E. rostellata they are often rugulose. Specimens from Coconino and Santa Cruz counties, Arizona, are probably E. suksdorfiana but lack achenes so cannot be identified with certainty.

Selected References

None.

Lower Taxa

None.

"shortened" is not a number.

... more about "Eleocharis suksdorfiana"
brown +  and gray or dark-brown +
0.2 cm2 mm <br />0.002 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
biconvex;trigonous;equilaterally trigonous;compressed +
0.7mm;1.3mm +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
brown +  and red +
tapered +
S. Galen Smith* +, Jeremy J. Bruhl* +, M. Socorro González-Elizondo* +  and Francis J. Menapace* +
Beauverd +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
persistent +
enlarged +
distinct +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
5 cm50 mm <br />0.05 m <br /> (40 cm400 mm <br />0.4 m <br />) +
compressed +, 3-5-angled +  and terete +
0.3mm;1.2mm +
stramineous +  and brown or reddish proximally +
subtruncate +  and obtuse +
Alta. +, B.C. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, Oreg. +, Utah +  and Wash. +
(0–)1100–3300 m +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
subtending +
biconvex +  and trigonous +
Bogs, fens, wet meadows, springs, wet gravel near ponds +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
with (1-)3-6(-30) bristles and/or scales +
Fruiting late spring–summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
stramineous;medium brown or red brown or blackish brown +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Bull. Soc. Bot. Genève +
shorter and thicker +
ascending +  and horizontal +
caudex-like +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
adventitious +
persistent +
basal +  and proximal +
2-keeled +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not fibrous +  and membranous +
cylindric +
Illustrated +  and Endemic +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
proliferating +
many-ridged;subterete;slightly compressed +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0-2 times as wide as thick +
1 +  and 3 +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
2-fid +  and 3-fid +
Eleocharis paucifora var. suksdorfiana +  and Eleocharis quinqueflora var. suksdorfiana +
Eleocharis suksdorfiana +
Eleocharis subg. Zinserlingia +
species +
0.4mm;0.5mm +
0.3mm +  and 0.5mm +
stoloniferous +  and rhizomatous +