Click on the language to view common names.
Common Names in English:
White Beaksedge, White Beak-Rush
Common Names in French:
, cespitose or not, rhizomatous
or not, stoloniferous
or not. Roots
, principally adventitious. Stems (culms
) usually trigonous
, occasionally terete
, rarely compressed
, usually solid, rarely hollow or septate
. Leaves basal and/or cauline, alternate, usually 3-ranked, rarely 2-ranked or multi-ranked, bases
enclosing stem, margins
usually fused; junction of sheaths and blades
often with adaxial
flaps of tissue
of hair (ligules) ; blades frequently absent from some basal leaves
, rarely from cauline leaves, when present divergent or ascending
, flat, folded, plicate
, rolled, or terete, linear
) a shortened axis; glumaceous
) 1-many, spirally arranged
, sometimes 2-ranked, usually appressed
or ascending; scales usually all fertile
, each subtending
a single flower, sometimes proximal
and/or distal scales empty; lateral
spikes often with basal, usually empty, usually 2-keeled scale (prophyll) ; occasionally prophyll subtending and enclosing rachilla, bearing 1 pistillate
, sometimes (0-) 3 staminate flowers
and empty scales (Carex, Cymophyllus, and Kobresia) . Secondary inflorescences panicles, often modified to corymb, pseudoumbel, cyme (anthela), raceme
, spike, or capitulum (head
), rarely single spike, usually subtended by foliaceous
or, less frequently, glumaceous bracts; secondary inflorescences sometimes simulating spikelets (Carex, Cymophyllus, and Kobresia) . Flowers hypogynous, bisexual
in most genera, unisexual
in Scleria, Carex, Cymophyllus, and Kobresia; perianth absent or with (1-) 3-6(-30) bristles
and/or scales, usually falling off with fruit; stamens usually (1-) 3, rarely more, usually distinct
; pistils 1, 2-3(-4) -carpellate, fused, locule 1; style undivided or branches 2-3(-4) ; stigma sometimes papillate
. Fruits achenes, usually trigonous or biconvex
; pericarps thin (except in Scleria) . Seeds 1; testa thin, free
from pericarp; embryo basal; endosperm abundant. x
= 5-ca. 100.
Genera ca. 100, species ca. 5000 (27 genera, 843 species in the flora ) : worldwide.
No consensus exists regarding the number of genera and the overall relationships of genera within Cyperaceae. The most recent account of the family (P. Goetghebeur 1998) recognized 104 genera distributed among 4 subfamilies and 14 tribes . That arrangement differs somewhat from that of J. Bruhl (1995) . With one minor exception the arrangement of the family here follows that of Goetghebeur.
The family is characterized by the occurrence of a number of unusual cytological features including: (1) chromosomes with diffuse centromeres , (2) post-reductional meiosis, and (3) pollen grains formed from tetrads in which 3 of the 4 microspores fail to develop. The first two features are found in at least some Juncaceae and are unique to the two families. Juncaceae also have pollen in tetrads, but in that family all four microspores produce pollen grains. Some species in some genera of Cyperaceae (particularly Eleocharis) possess chromosomes with localized centromeres (S. S. Bir et al. 1993) . The wide range of chromosome numbers found in Cyperaceae is largely because of agmatoploidy; polyploidy has been hypothesized for some genera, especially Eleocharis, although polyploidy has not been demonstrated unequivocally.
Because of morphologic similarities in vegetative and inflorescence characters, the family has commonly been associated with Poaceae. Cytological features discussed above clearly indicate that to be a superficial similarity . Data from rbcL studies also support the view that Cyperaceae and Poaceae are not closely related (M. R. Duvall et al. 1993b; G. M. Plunkett et al. 1995) ; they do support the concept of close relationship between Cyperaceae and Juncaceae.
For most families of flowering plants the phenological data given are flowering times. Because most Cyperaceae cannot be reliably identified when in flower, in this volume fruiting time is given for all species by season , sometimes qualified by early, mid, or late, or by months. The fruiting time has been interpreted broadly to include the period when the fruit is more or less fully formed but not yet ripe . The fruiting period provided covers the entire range of the taxon . Quite a difference between fruiting periods in different parts of the range of the species may well occur, especially for widespread species and species with extensive elevation range.
For a recent, comprehensive review of the economic importance of Cyperaceae, see D. A. Simpson and C. A. Inglis (2001) .
, cespitose or not, often scaly-rhizomatous. Culms
, usually trigonous
, wiry to stout. Leaves basal and cauline, polystichous
, mostly 3-ranked; sheaths
open apically, glabrous
; ligules present or absent; blades
flat, V-shaped in cross
, typically keeled
, usually scabrid
. Inflorescences terminal
, rarely pseudolateral, paniculate
, racemose, or capitate; spikelets
3-100 or more; involucral bracts
or rarely the proximal
erect, leaflike. Spikelets: scales
spirally or distichously arranged, each subtending
flower; 1 or more proximal scales empty. Flowers all bisexual
or sometimes distalmost staminate
; 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
; stamens 2-3; styles undivided or shallowly 2-fid, or deeply cleft
into 2(-3) linear
branches; style base persistent as tubercle on fruit, usually articulate
to achene apex, distinct
, enlarged. Fruits achenes, borne on pedicellar joint
, directly distal to compact
receptacle; body various shades of brown, flattened, lenticular
), or nearly terete, smooth and lustrous
or variously ridged
, latticed), papillate
, or warty; tubercle mostly conic or variously triangular, terete or flattened and 2-edged, sometimes longitudinally sulcate
, widest across base
; base along narrow transverse
, 2-lobed, or topping achenial "neck" or buttress
, much narrower, as wide as, or wider than achene apex, decurrent down
Species over 250: worldwide, mostly in sunny places with wet, acidic soils.
The working basis for the classification used here is from G. Kükenthal, the first modern monographer of Rhynchospora worldwide (19491951). He divided the genus into two subgenera , Haplostylae (Nees) Bentham and Diplostylae Bentham, based on degree of stylar branching. In subg. Haplostylae the stylar apex is virtually unlobed, surmounted by two tubercle like stigmas, or shallowly bifid with the stigmatic branches rarely approaching 1 mm. Thus the stigmatic area is small compared to that of plants in subg. Diplostylae, in which the stylar apex is divided into two narrowly linear, elongate stigma branches.
Most members of Rhynchospora are cespitose. This does not preclude the possibility of some species (e.g. , R. caduca, R. mixta) from having well developed scaly rhizomes or others (e.g., R. oligantha, R. breviseta, R. rariflora, R. stenophylla) from forming dense, hard-based tufts from packed, intertwined short rhizomes. Only a few species are strongly clonal by elongate rhizomes; those are mostly in subg. Haplostylae (e.g., R. tracyi, R. careyana, R. inundata) or subg. Diplostylae sect. Dichromena (e.g., R. colorata).
Rhynchosporas are often dominant or co-dominant herbaceous graminoids in marshlands and savannas . Many species occuring in marshlands provide food for migratory waterfowl.
Species Rhynchospora alba
, densely cespitose, 6-75 cm; rhizomes mostly absent.
, leafy, obscurely trigonous
to nearly terete
, slender. Principal leaves mostly overtopped by culm;
, proximally flat, 0.5-1.5 mm,
apex tapering, trigonous. Inflorescences: clusters
1 or 2-3, then
widely spaced, narrowly turbinate
, 1.5-2.5 cm wide;
leafy bracts often exceeded by distal cluster. Spikelets
brown to nearly white, ellipsoid
, 3.5-5.5 mm, apex acute; fertile
, 3-3.5(-4) mm, apex acute or acuminate, midrib
. Flowers: perianth bristles
10-12, slightly overtopping
tubercle, retrorsely barbellate
or rarely smooth
Fruits 1(-2) per spikelet, (2.3-) 2.5-3 mm; body pale brown with
paler center, stipitate
, 1.5-1.8(-2) ×
0.9-1.2 mm; surfaces transversely striate
, relatively smooth, rim
narrow, flowing to tubercle base; tubercle narrowly triangular subulate
The smooth-bristled Rhynchospora alba forma laeviseta Gale mostly occurs with the typical antrorsely barbellate type in Pennsylvania, the Great Lakes , British Columbia, Newfoundland, and Nova Scotia. [source]
Flowers: Bloom Period: May, June, July, August, September, October.
Typically found at an altitude of 0 to 1,840 meters (0 to 6,037 feet).
- Whittaker & Margulis,1978
- Haeckel, 1866
- Cavalier-Smith, 1981
- Sinnott, 1935 ex Cavalier-Smith, 1998
- Vascular Plants
- Kenrick & Crane, 1997
- Brongniart, 1843
- Takhtajan, 1967
- Takhtajan, 1967
- Small, 1903
- Family: Cyperaceae () - A.L. de Jussieu, 1789, nom. cons. - Sedge Family
- Order: Poales () - Small, 1903
- Superorder: Juncanae () - Takhtajan, 1967
- Subclass: Commelinidae () - Takhtajan, 1967
- Class: Spermatopsida () - Brongniart, 1843
- Infraphylum: Radiatopses () - Kenrick & Crane, 1997
- Subphylum: Euphyllophytina ()
- Phylum: Tracheophyta () - Sinnott, 1935 ex Cavalier-Smith, 1998 - Vascular Plants
- Subkingdom: Viridaeplantae () - Cavalier-Smith, 1981
- Kingdom: Plantae () - Haeckel, 1866 - Plants
Dichromena alba (L.) J. F. Macbr. • Dichromena alba (Linnaeus) J. F. Macbride • Phaeocephalum album (L.) House • Phaeocephalum album (Linnaeus) House • Rhynchospora luguillensis Britton • Rhynchospora luquillensis Britt. • Schoenus albus L. • Schoenus albus Linnaeus • Triodon albus (L.) Farw. • Triodon albus (Linnaeus) Farwell
Status: Accepted Name
Last scrutiny: 21-Jun-2005
Members of the genus Rhynchospora
ZipcodeZoo has pages for 112 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:
R. alba (White Beaksedge) · R. baldwinii (Baldwin's Beaksedge) · R. berteroi (Little Beaksedge) · R. brachychaeta (West Indian Beaksedge) · R. breviseta (Shortbristle Beaksedge) · R. caduca (Anglestem Beaksedge) · R. californica (California Beaksedge) · R. capillacea (Horned Beakrush) · R. capitellata (Brownish Beakrush) · R. careyana (Broadfruit Horned Beaksedge) · R. cephalantha (Bunched Beaksedge) · R. cephalantha var. cephalantha (Bunched Beaksedge) · R. chalarocephala (Loosehead Beaksedge) · R. chalarocephala Fern. & Gale var. chalarocephala Fern. & Gale (Loosehead Beaksedge) · R. chalarocephala var. angusta (Loosehead Beaksedge) · R. chalarocephala var. chalarocephala (Loosehead Beaksedge) · R. chapmanii (Chapman's Beaksedge) · R. chinensis (Spiked Beaksedge) · R. chinensis subsp. spiciformis (Spiked Beaksedge) · R. ciliaris (Fringed Beaksedge) · R. colorata (Starrush Whitetop) · R. compressa (Flatfruit Beaksedge) · R. corniculata (Short-Bristled Horned Beak-Sedge Rhynchospora Corniculata) · R. corniculata var. corniculata (Shortbristle Horned Beaksedge) · R. corymbosa (Matamat) · R. crinipes (Mosquito Beadsedge) · R. culixa (Georgia Beaksedge) · R. curtissii (Curtiss' Beaksedge) · R. debilis (Savannah Beaksedge) · R. decurrens (Swampforest Beaksedge) · R. divergens (Spreading Beaksedge) · R. elliottii (Elliott's Beaksedge) · R. eximia (Florida Beaksedge) · R. fascicularis (Fascicled Beaksedge) · R. fascicularis var. distans (Fascicled Beaksedge) · R. fascicularis var. fascicularis (Fascicled Beaksedge) · R. fernaldii (Fernald's Beaksedge) · R. filifolia (Threadleaf Beaksedge) · R. floridensis (Florida Whitetop) · R. fusca (Brown Beaksedge) · R. gigantea (Giant Beaksedge) · R. globularis (Globe Beakrush) · R. globularis var. globularis (Globe Beaksedge) · R. globularis var. pinetorum (Globe Beaksedge) · R. globularis var. saxicola (Stone Mountain Beaksedge) · R. glomerata (Clustered Beaksedge) · R. glomerata var. glomerata (Clustered Beaksedge) · R. gracilenta (Slender Beaksedge) · R. grayi (Gray's Beaksedge) · R. harperi (Harper's Beaksedge) · R. harveyi (Harvey's Beaksedge) · R. hispidula (Hairy Beaksedge) · R. holoschoenoides (Fly Beaksedge) · R. inexpansa (Nodding Beaksedge) · R. intermedia (Pinebarren Beaksedge) · R. inundata (Narrowfruit Horned Beaksedge) · R. jamaicensis (Jamaican Beaksedge) · R. knieskernii (Knieskern's Beaked-Rush) · R. kunthii (Kunth's Beaksedge) · R. latifolia (Sandswamp Whitetop) · R. lindeniana (Bahama Beaksedge) · R. lindeniana var. bahamensis (Bahama Beaksedge) · R. lindeniana var. lindeniana (Linden Beaksedge) · R. longiflora (Longleaf Beaksedge) · R. macra (Large Beaksedge) · R. macrostachya (Tall Horned Beaksedge) · R. macrostachya var. macrostachya (Tall Horned Beaksedge) · R. marisculus (Caribbean Beaksedge) · R. megalocarpa (Sandyfield Beaksedge) · R. micrantha (Tropical Beaksedge) · R. microcarpa (Southern Beaksedge) · R. microcephala (Smallhead Beaksedge) · R. miliacea (Millet Beaksedge) · R. mixta (Mingled Beaksedge) · R. nervosa ciliata (Yerba De Estrella) · R. nervosa subsp. ciliata (Yerba De Estrella) · R. nitens (Shortbeak Beaksedge) · R. nivea (Showy Whitetop) · R. odorata (Fragrant Beaksedge) · R. oligantha (Featherbristle Beaksedge) · R. pallida (Pale Beaksedge) · R. perplexa (Pineland Beaksedge) · R. perplexa var. perplexa (Pineland Beaksedge) · R. pleiantha (Coastal Beaksedge) · R. plumosa (Plumed Beaksedge) · R. podosperma (Bird Beaksedge) · R. polyphylla (Leafy Beaksedge) · R. punctata (Dotted Beaksedge) · R. pusilla (Beak-Rush) · R. racemosa (Racemed Beaksedge) · R. radicans microcephala (Tropical Whitetop) · R. radicans subsp. microcephala (Tropical Whitetop) · R. rariflora (Fewflower Beaksedge) · R. recognita (Globe Beaksedge) · R. rubra (Rhynchospora) · R. rufa (Red Beaksedge) · R. rugosa (Claybank Beaksedge) · R. rugosa lavarum (Claybank Beaksedge) · R. rugosa subsp. lavarum (Claybank Beaksedge) · R. scirpoides (Longbeak Beaksedge)
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Accessed through GBIF Data Portal November 18, 2007:
- Jyväskylä University Museum - The Section of Natural Sciences, Vascular plant collection of Jyvaskyla University Museum
- Oregon State University, Vascular Plant Collection
- The Danish Biodiversity Information Facility, Botany registration database by Danish botanists
- The Swedish Museum of Natural History
- , Botany
- The Swedish Museum of Natural History
- , Herbarium of Oskarshamn
- The Swedish Museum of Natural History
- , Lund Botanical Museum
- The Swedish Museum of Natural History
- , Plants
- UK National Biodiversity Network, Dorset Environmental Records Centre - Bryophyte Survey of the Poole Basin Mires - NBN South West Pilot Project Case Studies
- UK National Biodiversity Network, Environment and Heritage Service - EHS Species Datasets
- University of Alabama Biodiversity and Systematics, Herbarium
- University of Alaska Museum of the North, University of Alaska Museum of the North Herbarium
- Biodiversity Heritage Library NamebankID: 2660611
- Catalogue of Life Accepted Name Code: Kew-261498
- Global Biodiversity Information Facility Taxonkey: 2704925
- Globally Unique Identifier: urn:lsid:ipni.org:names:311997-1
- GRIN Nomen Number: 416475
- Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 40151
- U.S.D.A. Plant Symbol: RHAL3
- Zipcode Zoo Species Identifier: 59906
- Peter W. Ball, A. A. Reznicek, David F. Murray "Cyperaceae". in Flora of North America Vol. 23 Page 3, 4, 192, 243, 252. Oxford University Press. Online at EFloras.org. [back]
- Robert Kral "Rhynchospora". in Flora of North America Vol. 23 Page 6, 7, 200, 201, 231, 238. Oxford University Press. Online at EFloras.org. [back]
- "Rhynchospora". in Flora of North America Vol. 23 Page 202, 213, 214, 230. Oxford University Press. Online at EFloras.org. [back]
- Mean = 172.570 meters (566.175 feet), Standard Deviation = 192.240 based on 7,975 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]