Rhynchospora harperi |
Rhynchospora globularis |
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Harper's beaksedge |
globe beakrush, globe beaksedge |
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Habit | Plants perennial, solitary or cespitose, 50–70 cm; rhizomes absent. | Plants perennial, cespitose or single, 30–70(–80) cm; rhizomes absent. | ||||||||
Culms | erect to excurved, leafybased, narrowly linear, ± terete. |
erect or excurved, lax, leafy, slender to wiry. |
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Leaves | shorter than culm; blades ascending, narrowly linear, proximally flat or margins slightly involute, 0.5–1(–2) mm wide, distally canaliculate, apex trigonous, tapering, subulate. |
overtopped by culm; basal leaves spreading, twisted, distal longer, erect or ascending; blades proximally flat, 1–3 mm wide, apex trigonous, subulate, tapering. |
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Inflorescences | spikelet clusters 1–3, laterals 0–2, all turbinate to hemispheric, terminal internode usually excurved; leafy bracts setaceous, overtopping inflorescence. |
spikelet clusters 1–4, proximalmost widely spaced, spikelets elongate, open, turbinate or compactlobed hemispheric; branches erect to ascending; leafy bracts setaceous, exceeding proximal clusters, exceeded by distal clusters. |
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Spikelets | redbrown, lanceoloid, 5–7 mm, apex acute; fertile scales lanceolate, (2.5–)4–5 mm, apex acute to acuminate; midrib paralleled by several indistinct ribs, excurrent as short awns. |
mostly dark brown to brown, globose to broadly ovoid, (2–)2.5–3(–4) mm, apex acute; fertile scales broadly ovate to orbiculate, 1.7–2.3 mm, apex obtuse to rounded or emarginate, midrib mostly included, sometimes excurrent as apiculus. |
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Flowers | bristles 6, reaching from mid tubercle to beyond tip. |
perianth bristles 6 or less, antrorsely barbellate, of various lengths. |
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Fruits | 3(–4) per spikelet, 2.1–2.5 mm; stipe and receptacle 0.2–0.3 mm, sparsely setose and setulose; body glossy, brown with pale center, obovoid-lenticular, 1.1–1.5 × 1–1.1 mm, surfaces finely longitudinally lined, variably low papillatecancellate, also often transversely with wavy lines of dark dots; tubercle flattened, triangular-subulate, (0.8–)0.9–1(–1.1) mm, setulose-ciliate. |
1–3 per spikelet, 1.5–1–8 mm (–2 mm in var. pinetorum); body tumidly biconvex; surfaces transversely wavyrugose, intervals of vertically rectangular alveolae or transverserugosity indistinct, surface isodiametrically alveolate or cancellate; tubercle shortconic to patelliformapiculate. |
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Rhynchospora harperi |
Rhynchospora globularis |
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Phenology | Fruiting summer–fall. | |||||||||
Habitat | Sands and peats of bogs, stream banks, edges of pineland savanna ponds, Hypericum ponds | |||||||||
Elevation | 0–100 m (0–300 ft) | |||||||||
Distribution |
AL; DE; FL; GA; MD; MS; NC; SC; Central America (Belize)
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AL; AR; CA; FL; GA; IN; LA; MD; MO; MS; NC; NJ; OH; OK; PA; SC; TN; TX; VA; Central America; West Indies
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Discussion | Rhynchospora harperi is most abundant in a very special habitat referred to here as the “Hypericum pond.” These are typically shallow ponds in pine savannas, frequently ringed by stands of Nyssa, Taxodium, Ilex, and Cyrilla, but most of the pond itself is dominated by one or more myriandrous shrubby Hypericum species. Here R. harperi is distinguished from other species by the often abrupt bend of its ultimate internode. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 3 (3 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 23, p. 233. | FNA vol. 23, p. 227. | ||||||||
Parent taxa | Cyperaceae > Rhynchospora | Cyperaceae > Rhynchospora | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | R. fascicularis var. harperi, R. leptorhyncha | R. cymosa var. globularis | ||||||||
Name authority | Small: Man. S.E. Fl., 182, 1503. (1933) | (Chapman) Small: Man. S.E. Fl., 184. (1933) | ||||||||
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