Compilation
Eleocharis obtusa

22 Images see all

Previous
Next

Name

Identification
Eleocharis diandra [family CYPERACEAE ] Verified by Schultze-Motel, W., Eleocharis obtusa (Willd.) Schult. [family CYPERACEAE ] (stored under name); Verified by Not on sheet.,
Related name
  • Scirpus capitatus
  • Eleocharis ovata
  • Eleocharis obtusa
  • Eleocharis diandra
Common name
  • éléocharide ovale, Flora of North America Vol. 23
  • Blunt spike-rush, Flora of North America Vol. 23
  • éléocharide obtuse, Flora of North America Vol. 23
  • Ovate spike-rush, Flora of North America Vol. 23

Flora

Entry for Eleocharis ovata (Roth) Roemer & Schultes [family CYPERACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 23,
Names
Eleocharis ovata (Roth) Roemer & Schultes [family CYPERACEAE], in J. J. Roemer et al., Syst. Veg., 2: 152. 1817
Scirpus ovatus Roth [family CYPERACEAE], Tent. Fl. Germ., 2: 562. 1793
Eleocharis obtusa (Willdenow) Schultes var. ovata (Roth) Drepalik & Mohlenbrock [family CYPERACEAE]
Eleocharis ovata var. heuseri Uetrichtz [family CYPERACEAE]
Treatment Author(s)
S. Galen Smith*
Jeremy J. Bruhl*
M. Socorro González-Elizondo*
Francis J. Menapace*
Information
Culms 2–35 cm × 0.3–1 mm. Leaves: apex of distal leaf sheath obtuse to acute, tooth to 0.2 mm. Spikelets ovoid, 2–8 × 2–4 mm, apex acute (to blunt); floral scales 25–100+, ca. 10 per mm of rachilla, orange-brown, rarely stramineous, ovate, 1.5–2 × 1 mm, midribs often keeled in distal part of spikelet, apex rounded to subacute. Flowers: perianth bristles present, rarely absent, (5–)6–7, brown, fairly slender, exceeding tubercle; stamens 2(–3); anthers brown, 0.3 mm; styles 2-fid or some 3-fid. Achenes 0.75–1 × 0.6–0.85 mm. Tubercles deltoid, 0.3–0.5 × 0.3–0.5 mm, 3/5 of to as high as wide, 1/3–2/3 as high and 1/2–3/4 as wide as achene. 2n = 10.
Phenology Fruiting
summer
jun
jul
aug
fall
sep
oct
nov
Altitude range
10–700 m (East), 1500–2000 m (Arizona);
Distribution
Eurasia.USA Ariz.USA Conn.USA Ill.USA Ind.USA IowaUSA Ky.USA MaineUSA Mass.USA Mich.USA Minn.USA Mo.USA N.H.USA N.J.USA N.Y.USA OhioUSA Okla.USA Oreg.USA Pa.USA Vt.USA Va.USA Wash.USA W.Va.USA Wis.Canada Alta.Canada B.C.Canada N.B.Canada Nfld. and Labr.Canada N.S.Canada Ont.Canada P.E.I.Canada Que.
Discussion
Although Eleocharis ovata has often been confused with E. obtusa, B. M. H. Larson and P. M. Catling (1996) showed that these species may be distinguished by non-overlapping widths of the tubercles, at least in Canada. The records of E. ovata in New Brunswick, Newfoundland, Nova Scotia, and Prince Edward Island are based on B. M. H. Larson and P. M. Catling (1996) and the records in Illinois, Indiana, Missouri, Montana, New Jersey, Oregon, and Washington are based on D. M. Hines (1975). Eleocharis ovata probably also occurs in Manitoba and Saskatchewan.

Related Materials