Eleocharis wolfii

(A. Gray) A. Gray ex Britton in H. N. Patterson

in H. N. Patterson, Cat. Pl. Illinois, 46. 1876.

Common names: Wolf’s spike-rush
IllustratedEndemic
Basionym: Scirpus wolfii A. Gray Proc. Amer. Acad. Arts 10: 77. 1874
Treatment appears in FNA Volume 23. Treatment on page 110. Mentioned on page 108, 109.

Plants perennial, often forming large mats; rhizomes 0.25–0.6 mm thick, internodes 1–4 cm, scales 2 mm. Culms sometimes decumbent, in same plant sides variably smooth or with 1 to few acute ridges (often nearly smooth or with 1 ridge on 1 side and several ridges on the other), greatly compressed, usually inrolled when dry, rectangular in cross-section, 10–40 cm × 0.3–1.5 mm, 0.2–0.5 mm thick, firm, margins often sharply acute, margins and often 1 or more ridges minutely serrulate at 20–30X. Leaves: distal leaf-sheaths persistent, red proximally, colorless or stramineous or whitish distally, slightly inflated, thickly membranous, apex acute. Spikelets ovoid or lanceoloid, 3–9 × 1.5–2.5 mm, apex acute; floral scales 15–30, 6 per mm of rachilla, orangebrown or often stramineous or colorless, midrib region stramineous or greenish, ovatelanceolate, (2.2–) 2.7–3.2 × 1.5 mm, midrib prominent, apex acute. Flowers: perianth bristles absent; anthers 1.1–1.75 mm. Achenes compressedtrigonous, with angles plus longitudinal ridges ca. 9–13, prominent, obovoid, mostly 2 times longer than wide, 0.7–0.9 (–1.1) × (0.4–) 0.5 mm, trabeculae 30–60, rather obscure and crowded. Tubercles brownish, pyramidal, usually depressed, 0.1–0.15 × 0.2–0.25 mm.


Phenology: Fruiting late spring–early summer (May–Jun).
Habitat: Ephemeral pools in open grasslands, oak woodlands on river terraces, limestone barrens
Elevation: 10–500 m

Distribution

V23 166-distribution-map.jpg

Ala., Ark., Colo., Ill., Ind., Iowa, Kans., La., Minn., Miss., Mo., N.Y., N.Dak., Ohio, Okla., Tenn., Tex., Wis.

Discussion

Eleocharis wolfii is presumably extirpated from Colorado, Kansas, New York (Long Island), and Ohio. It was recently rediscovered in Wisconsin. Some literature reports (e.g. from the Great Plains) are based on misidentified specimens. I have not seen specimens to verify literature reports from Alberta, Saskatchewan, Colorado, Missouri, and Nebraska.

Selected References

None.

Lower Taxa

None.
... more about "Eleocharis wolfii"
trigonous;nearly terete +
0.11 cm1.1 mm <br />0.0011 m <br /> (0.175 cm1.75 mm <br />0.00175 m <br />) +
S. Galen Smith* +, Jeremy J. Bruhl* +, M. Socorro González-Elizondo* +  and Francis J. Menapace* +
(A. Gray) A. Gray ex Britton in H. N. Patterson +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
shortened +
persistent +
enlarged +
Scirpus wolfii +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
Wolf’s spike-rush +
1 cm10 mm <br />0.01 m <br /> (40 cm400 mm <br />0.4 m <br />) +
rectangular +  and compressed +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.2mm;1.2mm +
whitish +, stramineous +, colorless +  and red +
Ala. +, Ark. +, Colo. +, Ill. +, Ind. +, Iowa +, Kans. +, La. +, Minn. +, Miss. +, Mo. +, N.Y. +, N.Dak. +, Ohio +, Okla. +, Tenn. +, Tex. +  and Wis. +
10–500 m +
colorless +, stramineous +, often +  and orangebrown +
0.1 cm1 mm <br />0.001 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
subtending +
biconvex +  and trigonous +
Ephemeral pools in open grasslands, oak woodlands on river terraces, limestone barrens +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
large +
0.22 cm2.2 mm <br />0.0022 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
0.27 cm2.7 mm <br />0.0027 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
ovatelanceolate +
1.5 cm15 mm <br />0.015 m <br /> (?) +
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–early summer (May–Jun). +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
stramineous;medium brown or red brown or blackish brown +
in H. N. Patterson, Cat. Pl. Illinois, +
ascending +  and horizontal +
caudex-like +
0.025 cm0.25 mm <br />2.5e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
0.09 cm0.9 mm <br />9.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.7mm;0.9mm +
obovoid +  and acute +
adventitious +
basal +  and proximal +
2-keeled +
2 cm20 mm <br />0.02 m <br /> (?) +
cylindric +
Illustrated +  and Endemic +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
proliferating +
lanceoloid;ovoid +
0.2 cm2 mm <br />0.002 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
1.5mm;2.5mm +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
Eleocharis (sect. Undefined) ser. Aciculares +
Eleocharis wolfii +
Eleocharis subg. Scirpidium +
species +
0.1mm;0.15mm +
depressed +  and pyramidal +
0.2mm +  and 0.25mm +
0 +  and 10 +
stoloniferous +  and rhizomatous +