Eleocharis erythropoda |
Eleocharis parishii |
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bald spikerush |
Parish's spikerush |
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Habit | Plants perennial, mat-forming; rhizomes evident, long, 0.5–1.5 mm thick, soft to firm, cortex often breaking loose, longer internodes 5–30 mm. | Plants perennial, mat-forming; rhizomes evident, long, 0.5–1(2) mm thick, cortex persistent, longer internodes 5–30 mm. |
Culms | terete, 8–80 cm × 0.3–1.4 mm. |
terete or cross section elliptic (or rectangular), 10–50 cm × 0.2–0.7(1) mm. |
Spikes | ovoid to lanceoloid or nearly cylindric, 3–18 × 2–3(4) mm; proximal scale clasping all or nearly all of culm, subproximal scale with flower; floral scales 15–50, 4–5 per mm of rachilla, 2–3.5 × 1.5–1.7 mm; in proximal part of spike apex rounded; in distal part apex entire; acute. |
narrowly lanceoloid, 3–20 × 1.5–2.5 mm; proximal scale amplexicaul; entire, subproximal scale empty or with flower; floral scales 15–40, 3–4 per mm of rachilla, 2–3 × 1 mm; apex entire, rounded to obtuse in proximal part of spike; acute in distal part, keeled; at least in distal part of spike. |
Flowers | perianth bristles 4 or absent, usually equal, equaling achene to slightly exceeding tubercle; anthers 1–1.8 mm; stigmas 2. |
perianth bristles (0)3–7, often unequal; rudimentary to slightly exceeding tubercle; anthers 1.1–2 mm; stigmas 3. |
Achenes | biconvex, 0.9–1.6 × 0.7–1.2 mm |
compressed-trigonous, 0.8–1.4 × 0.5–0.7 mm. |
Distal leaf sheaths | persistent; apex broadly obtuse to subacute; tooth sometimes present; to 0.1 mm. |
persistent, not splitting; apex with tooth often present on most or all culms; to 1 mm. |
Tubercles | pyramidal; much higher than wide to lower than wide, 0.35–0.65 × 0.2–0.6 mm. |
pyramidal, often higher than wide, 0.3–0.4 × 0.25–0.35 mm. |
2n | =16, 18, 19, 20. |
=10. |
Eleocharis erythropoda |
Eleocharis parishii |
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Distribution | ||
Discussion | Marshes, wet meadows, fens, disturbed wetlands. 500–1500 m. BR, Owy. ID, WA; north to AK, east to New Brunswick and NC, southeast to AZ and MS. Native. Eleocharis erythropoda is the most delicate member of the E. palustris complex. Its proximal scales consistently clasp the entire culm, and its subproximal scales consistently subtend flowers. Intermediates between E. erythropoda and E. macrostachya may be more common in Oregon than pure E. erythropoda. |
Fresh to brackish wetlands, often on drying lake shores, pond margins, streamsides and springs. 200–500 m. Sisk. CA, NV; east to Kansas, south to Mexico. Native. |
Source | Flora of Oregon, volume 1, page 241 Barbara Wilson, Richard Brainerd, Nick Otting |
Flora of Oregon, volume 1, page 242 Barbara Wilson, Richard Brainerd, Nick Otting |
Sibling taxa | ||
Web links |
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