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anglestem beaksedge

long-beak beaksedge

Habit Plants perennial, cespitose, 70–150 cm; rhizomes often present, short, scaly. Plants annual, cespitose, (20–)30–80(–100) cm; rhizomes absent.
Culms

erect or ascending, leafy, trigonous.

erect or ascending, leafy, nearly terete or obscurely angular, many-ribbed, stiff.

Leaves

exceeded by culm;

blades linear, proximally 4–7 mm wide, apex trigonous, tapering.

exceeding or exceeded by inflorescences;

blades linear, proximally flat, 1–5 mm wide, apex trigonous, tapering.

Inflorescences

terminal and axillary;

clusters 3–6, mostly dense, narrowly to broadly turbinate, branches ascending; leafy bracts exceeeding proximalmost inflorescences.

terminal and axillary, clusters of corymbs 1–5, diffuse, branches ascending to divaricate; leafy bracts much exceeding axillary corymbs.

Spikelets

rich brown, ovoid, (3–)4–5 mm, apex acuminate;

fertile scales ovate, 2.5–3.5 mm, apex acuminate, midrib included or shortexcurrent.

redbrown to dark brown, ovoidlanceoloid, 3–6(–7) mm, apex acute;

fertile scales several, narrowly ovate, 2.5–3.5 mm, apex narrowly acute;

midrib included or shortexcurrent.

Flowers

perianth bristles mostly 6, exceeding tubercle tip.

perianth absent.

Fruits

mostly 3–4 per spikelet, 2–2.2 mm;

body brown on short pedicellar (to 0.3 mm) stalk, broadly obovoid, lenticular, 1.3–1.5 × 1–1.5 mm, surfaces transversely rugulose, vertically finely striate and rectangularalveolate;

tubercle compressed, triangular acuminate, 0.5–0.8 mm, edges setulose.

1.3–1.5 mm;

body brown to blackish, tumidly lenticular, nearly orbicular, 0.6–1 × 0.6–1 mm, margins distinct, narrow, flowing into base of tubercle;

tubercle flat, narrowly triangular, at least 0.5 mm high, base broadly 2-lobed, apex acuminate.

Rhynchospora caduca

Rhynchospora scirpoides

Phenology Fruiting summer–fall. Fruiting summer–fall or all year (south).
Habitat Low meadows, clearings, marshes, marsh borders, seeps, bog moats, savannas, ditches, pine flatwoods, swamps Moist to wet sands or peats of banks of streams and ditches, pond and lakeshores, depressions in savannas, marshes, often in moist to wet disturbed areas
Elevation 0–400 m (0–1300 ft) 0–200 m (0–700 ft)
Distribution
from FNA
AL; AR; FL; GA; LA; MS; NC; OK; SC; TN; TX; VA
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; CT; DE; FL; GA; IN; LA; MA; MD; MI; MS; NC; NJ; NY; RI; SC; TX; VA; WI; West Indies
[WildflowerSearch map]
[BONAP county map]
Discussion

Rhynchospora caduca has its closest relationships with the even more robust R. odorata Grisebach, on the one hand, and the swampinhabiting, more slender, and rhizomatous R. mixta Britton ex Small, on the other. Intergrades with R. odorata appear in Alabama and northwest Florida; intergrades with R. mixta appear where ranges overlap in both the Atlantic and Gulf coastal plains.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 23, p. 223. FNA vol. 23, p. 217.
Parent taxa Cyperaceae > Rhynchospora Cyperaceae > Rhynchospora
Sibling taxa
R. alba, R. baldwinii, R. brachychaeta, R. breviseta, 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. solitaria, 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. 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. solitaria, R. stenophylla, R. thornei, R. torreyana, R. tracyi, R. wrightiana
Synonyms Phaeocephalum caducum, R. patula Psilocarya scirpoides
Name authority Elliott: Sketch Bot. S. Carolina 1: 62. (1816) (Torrey) Grisebach: Cat. Pl. Cub., 247. (1866)
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