Eleocharis bella

(Piper) Svenson

Rhodora 31: 201. 1929.

Common names: Pretty spikerush
Illustrated
Basionym: Eleocharis acicularis var. bella Piper Fl. Palouse Reg., 35. 1901
Synonyms: Eleocharis acicularis var. minima Torrey ex Britton
Treatment appears in FNA Volume 23. Treatment on page 110. Mentioned on page 108, 109, 111.

Plants annual, rarely perennial, usually densely tufted; rhizomes rarely evident, 0.2–0.3 mm thick, internodes 1–5 mm, scales not evident. Culms often ascending or spreading, 4-angled or sometimes terete, sometimes sulcate, 1–7 cm × 0.2–0.3 mm, soft to firm. Leaves: sheaths stramineous, distal sheaths often splitting abaxially, slightly inflated distally, oblique, apex acute. Spikelets ovoid, 1.5–4 × 0.8–2 mm, apex acute; floral scales 4–15, 8 per mm of rachilla, colorless or reddish-brown, midrib region green, ovatelanceolate, not folded lengthwise, 1–1.5 × 0.5–0.7 mm, mibrib obscure to somewhat keeled, apex narrowly acute to acuminate, slightly recurved. Flowers: perianth bristles absent; anthers 0.3–0.5 mm. Achenes with angles and longitudinal ridges ca. 6–10, rather prominent, broadly ovoid, less than 2 times longer then wide, (0.55–) 0.65–0.75 × 0.3–0.4 mm, apex blunt, trabeculae distinct, 20–30. Tubercles grayish, mostly appressed, pyramidal, often depressed, 0.1–0.2 × 0.1–0.25 mm.


Phenology: Fruiting spring–summer.
Habitat: Bare, often drying soil of stream alluvium, lake margins, wet meadows
Elevation: 200–2900 m

Distribution

V23 167-distribution-map.jpg

Ariz., Calif., Idaho, Mont., Nev., N.Mex., Oreg., Wash., Mexico (Chihuahua)

Discussion

Eleocharis bella and E. acicularis seem to be amply distinct; putative hybrids are unknown. The occasional plants of E. bella with evident rhizomes, which include the type, are otherwise identical to plants apparently without rhizomes. Eleocharis bella is very similar to E. cancellata. There is an Illinois collection from Peoria in 1901, from the alluvial banks of the Illinois River.

Selected References

None.

Lower Taxa

None.
... more about "Eleocharis bella"
trigonous;nearly terete +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
S. Galen Smith* +, Jeremy J. Bruhl* +, M. Socorro González-Elizondo* +  and Francis J. Menapace* +
(Piper) Svenson +
flattened +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
shortened +
persistent +
enlarged +
Eleocharis acicularis var. bella +
glumaceous +  and foliaceous +
2-ranked +  and arranged +
ascending +  and appressed +
parallel +  and divergent +
terete +, rolled +  and plicate +
Pretty spikerush +
1 cm10 mm <br />0.01 m <br /> (7 cm70 mm <br />0.07 m <br />) +
spreading +  and ascending +
terete +  and 4-angled +
soft;firm +
0.2mm;0.3mm +
Ariz. +, Calif. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, Wash. +  and Mexico (Chihuahua) +
200–2900 m +
reddish-brown +  and colorless +
0.1 cm1 mm <br />0.001 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
subtending +
biconvex +  and trigonous +
Bare, often drying soil of stream alluvium, lake margins, wet meadows +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
multi-ranked +, 2-ranked +, 3-ranked +  and alternate +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
keeled +  and ovatelanceolate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 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 spring–summer. +
2-3(-4)-carpellate +
3 (?) +  and 1 (?) +
stramineous;medium brown or red brown or blackish brown +
ascending +  and horizontal +
caudex-like +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
0.055 cm0.55 mm <br />5.5e-4 m <br /> (0.065 cm0.65 mm <br />6.5e-4 m <br />) +
0.65mm;0.75mm +
0-2 times longer +
0.3mm;0.4mm +
adventitious +
basal +  and proximal +
not evident +
2-keeled +
cylindric +
Illustrated +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
proliferating +
0.2 cm2 mm <br />0.002 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
0.8mm;2mm +
1 (?) +  and 3 (?) +
septate +, hollow +  and solid +
compressed +, terete +  and trigonous +
papillate +
Eleocharis acicularis var. minima +
Eleocharis bella +
Eleocharis subg. Scirpidium +
species +
0.1mm;0.2mm +
depressed +  and pyramidal +
0.1mm +  and 0.25mm +
0 +  and 10 +
stoloniferous +  and rhizomatous +
perennial +  and annual +