Rhynchospora solitaria |
Rhynchospora curtissii |
|
---|---|---|
onespike beaksedge |
Curtiss' beaksedge |
|
Habit | Plants perennial, solitary or cespitose, 50–60 cm; rhizomes absent. | Plants perennial, densely cespitose, 10–30 cm; rhizomes absent. |
Culms | erect to ascending, narrowly linear, wandlike, terete, leafy proximal to middle. |
lax, erect to excurved, leafy toward base, filiform. |
Leaves | erect to ascending; blades proximally flat, 2.5–3.5 mm wide, apex tapering, tip abruptly blunt. |
overtopped by scape; blades filiform, distally flattened, channeled, tapering, to 1 mm wide, margins strongly involute, apex blunt. |
Inflorescences | terminal, cluster of spikelets crowded, broadly turbinate to hemispheric, to 1.5 cm wide; leafy bracts linearsetaceous, slightly exceeding cluster. |
spikelet clusters 1–3, laterals widely spaced, all narrowly turbinate, ellipsoid, or ovoid; leafy bracts setaceous, overtopping proximal clusters, often overtopped by terminal ones. |
Spikelets | orangebrown, lancefusiform, 6–7 mm, apex acuminate; fertile scales lanceovate, 4–5 mm, apex acuminate with excurved awn to 1 mm. |
erect or ascending, redbrown, lanciform, mostly 4.5–5 mm, apex acute; fertile scales lanceolate, (3–)4–4.5 mm, apex acute, apiculate. |
Flowers | bristles 3–4, some reaching tubercle tip, antrorsely barbellate. |
perianth absent. |
Fruits | 1–2 per spikelet, 2–2.1 mm; body brown with paler center, obovoidlenticular, 1.5–1.7 × 1.2–1.3 mm, margins flowing to tubercle; surfaces finely transversely striate with minute pits; tubercle lowtriangular, 0.3–0.5 mm. |
2–3(–5) per spikelet; stipe and receptacle 0.1–0.2(–0.3) mm, setose; body brown with pale glassy center, narrowly obovoidellipsoid, lenticular, 1.2–1.5 mm, margins narrow, flowing to tubercle; surfaces very finely lined longitudinally, transversely with wavy lines of tiny pits; tubercle narrowly triangular or slightly concavesided, flattened, 0.7–1.2(–1.5) mm. |
Rhynchospora solitaria |
Rhynchospora curtissii |
|
Phenology | Fruiting summer–fall. | Fruiting summer–fall. |
Habitat | Sandy peat of depressions in pine flatwoods savannas, edges of hillside bogs | Sands and peats of bogs, pineland pond shores, seeps, and low moist savannas |
Elevation | 0–200 m (0–700 ft) | 0–100 m (0–300 ft) |
Distribution |
GA |
AL; FL; MS |
Discussion | Of conservation concern. Rhynchospora solitaria appears to be the least common North American species of Rhynchospora with two of the five given localities apparently lost. The name “solitaria” is deceptive; the plants sometimes form small tufts of culms. The most distinctive feature in the field is the attractive orangebrown color of the narrow, acuminate, bristlescaled spikelets. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 23, p. 238. | FNA vol. 23, p. 234. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Phaeocephalum curtissii, R. filifolia var. ellipsoidea | |
Name authority | R. M. Harper: Bull. Torrey Bot. Club 28: 468. (1901) | Britton: in J. K. Small, Fl. S.E. U.S., 195, 1327. (1903) |
Web links |