Rhynchospora pusilla |
Rhynchospora inexpansa |
|
---|---|---|
|
nodding beaksedge |
|
Habit | Plants perennial, densely cespitose, 15–50(–60) cm; rhizomes absent. | Plants perennial, cespitose, 30–120 cm; rhizomes absent. |
Culms | erect or arching, leafy toward base, filiform, terete, wiry. |
arching, leafy, droopingtipped, ± terete, ribbed, slender. |
Leaves | overtopped by culm; blades linear to filiform, channeled, 0.3–0.5 mm wide, margins deeply involute, apex setaceous. |
|
Inflorescences | spikelet clusters 1–2(–3), dense to open, narrowly to broadly turbinate; branches capillary, variously elongate; leafy bracts setaceous, equaling or exceeding clusters. |
clusters of spikelets 3–6, progressively wider-spaced proximally, narrow, elongate; leafy bracts slender, mostly exceeding clusters. |
Spikelets | variously brown, ellipsoid, 2–3 mm, apex sharply acute; fertile scales ovate to nearly orbiculate, rounded, 1.2–1.8 mm, apiculate, convexcupulate, midrib slender, mostly included. |
redbrown, lanceoloid, 5–7 mm, apex acuminate; fertile scales narrowly ovate, 4–5 mm, apex acuminate, midrib included or shortexcurrent. |
Flowers | perianth absent. |
perianth bristles 6, exceeding tubercle, antrorsely barbellate. |
Fruits | 2–3 per spikelet, 0.7–0.9(–1) mm; body pale, obovoid-lenticular, (0.5–)0.6–0.9 × 0.4–0.5 mm, margin wirelike; surfaces transversely rugulose; tubercle buttonlike, depressed triangular, 0.05–0.1 mm, base lunate atop rounded fruit body. |
(1–)2–3(–4) per spikelet, 3–3.2 mm; body brown, narrowly oblong-ellipsoid, flattened, 2 × 0.8–1 mm; surface strongly transversely wavyrugose, vertically finely striate between ridges; tubercle compressed, narrowly triangular-subulate, 1 mm. |
Principal | leaves exceeded by culm; blades spreading to ascending, narrowly linear, proximally flat, 2–3.5 mm wide, apex trigonous, tapering. |
|
Rhynchospora pusilla |
Rhynchospora inexpansa |
|
Phenology | Fruiting summer–fall. | Fruiting summer–fall. |
Habitat | Moist sands, peats and silts of low meadows, savannas, bogs, seeps, pond shores | Sands, peats, clays, and silts of moist meadows, shores of ponds, flatwoods, disturbed low areas |
Elevation | 0–300 m (0–1000 ft) | 0–300 m (0–1000 ft) |
Distribution |
AL; FL; GA; LA; MS; NC; SC; TX; Mexico; Central America; West Indies |
AL; AR; FL; GA; LA; MS; NC; SC; TX; VA
|
Source | FNA vol. 23, p. 220. | FNA vol. 23, p. 222. |
Parent taxa | Cyperaceae > Rhynchospora | Cyperaceae > Rhynchospora |
Sibling taxa | ||
Synonyms | Phaeocephalum pusillum, R. intermixta | Schoenus inexpansus |
Name authority | Chapman ex M. A. Curtis: Amer. J. Sci. Arts, ser. 2, 7: 409. (1849) | (Michaux) Vahl: Enum. Pl. 2: 232. (1805) |
Web links |