The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

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
from FNA
GA
[BONAP county map]
from FNA
AL; FL; MS
[BONAP county map]
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 Cyperaceae > Rhynchospora Cyperaceae > Rhynchospora
Sibling taxa
R. alba, R. baldwinii, R. brachychaeta, R. breviseta, R. caduca, R. californica, R. capillacea, R. capitellata, R. careyana, R. cephalantha, R. chalarocephala, R. chapmanii, R. ciliaris, R. colorata, R. compressa, R. corniculata, R. crinipes, R. curtissii, R. debilis, R. decurrens, R. divergens, R. elliottii, R. eximia, R. fascicularis, R. fernaldii, R. filifolia, R. floridensis, R. fusca, R. globularis, R. glomerata, R. gracilenta, R. grayi, R. harperi, R. harveyi, R. indianolensis, R. inexpansa, R. inundata, R. knieskernii, R. kunthii, R. latifolia, R. macra, R. macrostachya, R. megalocarpa, R. megaplumosa, R. microcarpa, R. microcephala, R. miliacea, R. mixta, R. nitens, R. nivea, R. odorata, R. oligantha, R. pallida, R. perplexa, R. pineticola, R. pleiantha, R. plumosa, R. punctata, R. pusilla, R. rariflora, R. recognita, R. scirpoides, R. stenophylla, R. thornei, R. torreyana, R. tracyi, R. wrightiana
R. alba, R. baldwinii, R. brachychaeta, R. breviseta, R. caduca, R. californica, R. capillacea, R. capitellata, R. careyana, R. cephalantha, R. chalarocephala, R. chapmanii, R. ciliaris, R. colorata, R. compressa, R. corniculata, R. crinipes, R. debilis, R. decurrens, R. divergens, R. elliottii, R. eximia, R. fascicularis, R. fernaldii, R. filifolia, R. floridensis, R. fusca, R. globularis, R. glomerata, R. gracilenta, R. grayi, R. harperi, R. harveyi, R. indianolensis, R. inexpansa, R. inundata, R. knieskernii, R. kunthii, R. latifolia, R. macra, R. macrostachya, R. megalocarpa, R. megaplumosa, R. microcarpa, R. microcephala, R. miliacea, R. mixta, R. nitens, R. nivea, R. odorata, R. oligantha, R. pallida, R. perplexa, R. pineticola, R. pleiantha, R. plumosa, R. punctata, R. pusilla, R. rariflora, R. recognita, R. scirpoides, R. solitaria, R. stenophylla, R. thornei, R. torreyana, R. tracyi, R. wrightiana
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