Eleocharis minima


Enum. Pl. 2: 139. 1837.

Synonyms: Chaetocyperus jamesonii Steudel Chaetocyperus polymorphus Lindley & Nees Chaetocyperus viviparus Nees Eleocharis durandii Boeckeler Eleocharis jamesonii (Steudel) N. E. Brown Eleocharis minima var. ambigua Kükenthal Eleocharis oropuchensis Britton Eleocharis savannarum Boeckeler Eleocharis subtilis Boeckeler Eleocharis tenuissima Maury Eleocharis villaricensis Boeckeler Eleocharis wrightiana Steudel Isolepis ambigua
Treatment appears in FNA Volume 23. Treatment on page 97. Mentioned on page 71, 98.

Plants annual, tufted, often mat-forming, often stoloniferous, sometimes entirely vegetative; rhizomes absent. Culms erect, ascending or arching, quadrangular, sulcate, 1–13 cm × 0.1–0.3 mm, soft. Leaves: distal leaf sheaths persistent or disintegrating, red-brown, stramineous, green, or mottled red-brown, translucent, apex narrowly acute. Spikelets: basal spikelets often present, bisexual; often proliferous, ovoid or ellipsoid, laterally compressed when young, but terete at maturity, 2–7 × 1–2.6 mm, acute; proximal scale empty, often persistent, amplexicaulous, similar to floral scales; subproximal scale with a flower; floral scales spirodistichous (superficially appearing ± spiraled), (4–)10–28, 6–9 per mm of rachilla, pale brown, mottled red-brown to purple, ovate or elliptic, 1.3–2.1 × 0.7–1 mm, membranous, midribs green and red-brown, prominent, apex rounded to obtuse. Flowers: perianth bristles 6, colorless, white, or stramineous, slightly shorter than to equaling achene, spinules retrorse, acute; stamens 3; anthers 0.4–0.5 mm; styles 3-fid. Achenes greenish or pale brown or red-brown, often clearly spotted greenish or red-brown, ellipsoid to obovoid, trigonous (or terete?), angles prominent (keeled), 0.6–0.8 × 0.4–0.5 mm, apex constricted proximal to tubercle, smooth. Tubercles red-brown, pyramidal, trigonous, 0.1–0.3 × 0.2–0.4 mm.

Phenology: Fruiting mid spring–fall.
Habitat: Freshwater, sandy and peaty shores of lakes, muddy areas
Elevation: 0–400 m


V23 141-distribution-map.jpg

Fla., Md., Tex., Mexico, West Indies, Central America (Costa Rica, El Salvador, Guatemala, Nicaragua, Panama), South America.


Eleocharis minima is most often confused with E. bicolor and E. baldwinii (see comments under 33. E. bicolor). Although floral scales in E. minima often superficially appear to be spirally disposed, in reality they are spirodistichous, ± decussate, while in E. baldwinii they are strictly distichous in one plane. The number of floral scales per millimeter is much greater in E. minima than in E. baldwinii.

Selected References


Lower Taxa

... more about "Eleocharis minima"
Jeremy J. Bruhl +  and S. Galen Smith +
Fla. +, Md. +, Tex. +, Mexico +, West Indies +, Central America (Costa Rica +, El Salvador +, Guatemala +, Nicaragua +, Panama) +  and South America. +
0–400 m +
Freshwater, sandy and peaty shores of lakes, muddy areas +
Fruiting mid spring–fall. +
Illustrated +
Chaetocyperus jamesonii +, Chaetocyperus polymorphus +, Chaetocyperus viviparus +, Eleocharis durandii +, Eleocharis jamesonii +, Eleocharis minima var. ambigua +, Eleocharis oropuchensis +, Eleocharis savannarum +, Eleocharis subtilis +, Eleocharis tenuissima +, Eleocharis villaricensis +, Eleocharis wrightiana +  and Isolepis ambigua +
Eleocharis minima +
Eleocharis (sect. Eleocharis) ser. Tenuissimae +
species +