Rhynchospora Vahl (Q3442)
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Rhynchospora is a taxon with the rank genus within the tribe Rhynchosporeae
| Language | Label | Description | Also known as |
|---|---|---|---|
| English |
Rhynchospora Vahl
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Rhynchospora is a taxon with the rank genus within the tribe Rhynchosporeae
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Statements
taxon/id/Rhynchospora Vahl
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Rhynchospora Vahl
Rhynchospora
Vahl
FNA Editorial Committee. 2002. Flora of North America north of Mexico. Volume 23: Cyperaceae. Oxford University Press, New York.
accepted
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Herbs, annual or perennial, cespitose or not, often scaly-rhizomatous.
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Culms procumbent to erect, usually trigonous, wiry to stout.
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Leaves basal and cauline, polystichous, mostly 3-ranked;
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sheaths open apically, glabrous;
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ligules present or absent;
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blades flat, V-shaped in cross-section or terete, typically keeled abaxially, margins involute or revolute, usually scabrid or scabridulous.
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Inflorescences terminal, rarely pseudolateral, paniculate, corymbose, anthelate, racemose, or capitate;
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spikelets 3–100 or more;
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involucral-bracts 1–6, spreading or rarely the proximal erect, leaflike.
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Spikelets: scales spirally or distichously arranged, each subtending flower;
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1 or more proximal scales empty.
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Flowers all bisexual or sometimes distalmost staminate;
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perianth absent or of 2–12 (–20) bristles, usually persistent in fruit, rarely deciduous, variously barbed or plumed, shorter or longer than achene, seldom smooth;
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styles undivided or shallowly 2-fid, or deeply cleft into 2 (–3) linear stigmatic branches;
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style base persistent as tubercle on fruit, usually articulate to achene apex, distinct, enlarged.
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Fruits achenes, borne on pedicellar joint, directly distal to compact, dilated receptacle;
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body various shades of brown, flattened, lenticular (biconvex), or nearly terete, smooth and lustrous or variously ridged, pitted, alveolate (honeycombed), cancellate (netted, latticed), papillate, or warty;
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tubercle mostly conic or variously triangular, terete or flattened and 2-edged, sometimes longitudinally sulcate, widest across base;
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base along narrow transverse suture, lunate, 2-lobed, or topping achenial “neck” or buttress, much narrower, as wide as, or wider than achene apex, decurrent down achene margins.
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sulcate
sometimes longitudinally
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