Difference between revisions of "Rhynchospora gracilenta"
Ann. Lyceum Nat. Hist. New York 3: 216. 1835.
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|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
|name=Phaeocephalum gracilentum | |name=Phaeocephalum gracilentum | ||
|authority=(A. Gray) House | |authority=(A. Gray) House | ||
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+ | |name=Rhynchospora drummondiana | ||
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|name=Rhynchospora trichophylla | |name=Rhynchospora trichophylla | ||
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− | |synonyms=Phaeocephalum gracilentum;Rhynchospora gracilenta var. diversifolia;Rhynchospora trichophylla | + | |synonyms=Phaeocephalum gracilentum;Rhynchospora drummondiana;Rhynchospora gracilenta var. diversifolia;Rhynchospora trichophylla |
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|family=Cyperaceae | |family=Cyperaceae | ||
|phenology=Fruiting late spring–fall. | |phenology=Fruiting late spring–fall. |
Latest revision as of 21:07, 18 March 2024
Plants perennial, densely cespitose or solitary, 10–100 cm; rhizomes absent. Culms mostly lax, ascending to leaningexcurved, leafy, linear to filiform, terete. Leaves shorter than culm; blades ascending, filiform to narrowly linear, proximally flat, 0.5–1.5(–2.5) mm wide, margins distally strongly involute, apex trigonous, tapering. Inflorescences: spikelet clusters 1–3(–4), proximalmost distant, dense to sparse, narrowly turbinate to hemispheric; peduncles and branches ascending; leafy bracts linearsetaceous, mostly overtopping clusters. Spikelets redbrown, ovoid to lanceoloid, (3.5–)4–5 mm, apex acute; fertile scales ovate, 3–4.5 mm, apex acute, mucronate to awnedcuspidate. Flowers: bristles 6, mostly reaching tip of tubercle or beyond, antrorsely barbellate. Fruits 1–3 per spikelet, (2.5–)3–3.5(–4.1) mm; body dark brown with small pale center, lenticular, broadly ellipsoid to suborbicular, 1.3–2.1 × 1.3–1.5 mm, smooth, margins narrow, flowing into tubercle; tubercle triangular-subulate, compressed, mostly 1.5–2 mm.
Phenology: Fruiting late spring–fall.
Habitat: Moist to wet sandy peaty substrates in ditches, bogs, seeps, wet savannas, barrens, and flatwoods
Elevation: 0–400 m
Distribution
![V23 420-distribution-map.jpg](/w/images/c/c5/V23_420-distribution-map.jpg)
Ala., Ark., Del., Fla., Ga., La., Md., Miss., N.J., N.C., Okla., Pa., S.C., Tenn., Tex., Va., West Indies (Cuba), Central America.
Discussion
Through the southern coastal plain are widerleaved examples of Rhynchospora gracilenta that are sparingly cespitose to solitary-stemmed, often with but a single terminal inflorescence with dense clusters of spikelets (var. diversifolia). That would be a tenable designation were it not for the large numbers of populations with intermediate habit.
Selected References
None.