Cyperus Dives
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''Cyperus dives'' is a plant in the genus ''
Cyperus ''Cyperus'' is a large genus of about 700 species of sedges, distributed throughout all continents in both tropical and temperate regions. Description They are annual or perennial plants, mostly aquatic and growing in still or slow-moving w ...
'' of the
sedge The Cyperaceae are a family of graminoid (grass-like), monocotyledonous flowering plants known as sedges. The family is large, with some 5,500 known species described in about 90 genera, the largest being the "true sedges" genus ''Carex'' wit ...
family,
Cyperaceae The Cyperaceae are a family of graminoid (grass-like), monocotyledonous flowering plants known as sedges. The family is large, with some 5,500 known species described in about 90 genera, the largest being the "true sedges" genus ''Carex'' w ...
, which is found from south-west Syria to Africa, and from Pakistan to Vietnam. The
SANBI The South African National Biodiversity Institute (SANBI) is an organisation established in 2004 in terms of the National Environmental Management: Biodiversity Act, No 10 of 2004, under the South African Department of Environmental Affairs (l ...
Red List of South African Plants assessed its conservation status as being of "Least Concern" in 2006.


Description


Protologue

"Sa tige est lisse, triangulaire, haute de 13 à 16 décimètres à 5 pieds Ses feuilles radicales sont longues d'environ un mètre pieds rudes à leur sommet, sur leurs bords, leur nervure dorsale, et vers leurs sommet sur deux nervures principales de leur face supérieure, où elles sont aiguillonnées par des dents très fines. Les rayons d'ombrelle sont au nombre de cinq à dix; les plus grands ont 15 centimètres de longueur nviron 6 pouces "Les feuilles extérieures de l'involucre sont longues d'environ 3 à 6 décimètres n ou deux pieds et sont rudes et finement aiguillonnées de la même manière que les feuilles radicales. "Les épillets sont lancéolés, assez lâches, longs de 6 à 10 millimètres à 4 lignes présentant de toutes parts sur l'ombrelle leurs sommets aigus; ils contiennent seize, vingt et trente fleurs. Il y a trois étamines et un style trifide dans chaque fleur. Les écailles sont ovoïdes, tronquées à leur base, brièvement acuminées au sommet, membraneuses, un peu ondulées et comme déchirées sur les bords. "Le ''Cyperus dives'' croît dans les champs humides du Delta: on le cultive pour le couper et faire des nattes avec ses tiges fendues en lanières. "Le ''Cyperus dives'' et le ''Cyperus alopecuroides'' LIN, croîssent ensemble en Égypte, et servent au même usage l'un que l'autre; ils croîssent aussi dans l'Inde. J'ai vu quelquefois ces deux plantes confondues l'une avec l'autres dans les herbiers. "Le ''Cyperus alopecuroides'' n'a point les épillets lisses; ils ne sont point lancéolés, mais ovoïdes; leurs écailles sont peu serrées, et se replient en dedans par les bords en se desséchant; les styles sont bifides."


Translation

The stems are smooth, triangular, and grow to heights of . The basal leaves are about one metre (3 ft) long, and are rough at the top, on their edges, on their dorsal veins, and towards their apex on two main veins of their upper face, where they have very fine needle-like teeth. The umbel rays are five to ten in number; the largest are in length. The outer (leaf-like) bracts of the involucre are about long, and are rough and finely needled in the same way as the basal leaves. The spikelets are lanceolate, rather loose, long, showing on all sides of the umbel their sharp apices; they contain sixteen, twenty, and thirty flowers. Each flower has three stamens and a trifid style. The scales are ovoid, truncated at their base, briefly acuminate at the top, membranous, a slightly undulating and torn at the edges. ''Cyperus dives '' grows in the wet fields of the
Delta Delta commonly refers to: * Delta (letter) (Δ or δ), a letter of the Greek alphabet * River delta, at a river mouth * D (NATO phonetic alphabet: "Delta") * Delta Air Lines, US * Delta variant of SARS-CoV-2 that causes COVID-19 Delta may also re ...
: it is grown for cutting, to make mats from the stems split into strips. ''Cyperus dives '' and ''Cyperus alopecuroides '' L., grow together in Egypt, and serve the same purpose. They also grow in India. Sometimes, in herbaria, I have seen these two plants confounded. '' Cyperus alopecuroides '' does not have smooth spikelets; they are not lanceolate, but ovoid; their scales are not very tight, and fold inwards by the edges when drying; the styles are bifid.


References


External links


''Cyperus dives'' occurrence data
from
GBIF The Global Biodiversity Information Facility (GBIF) is an international organisation that focuses on making scientific data on biodiversity available via the Internet using web services. The data are provided by many institutions from around the ...

''Cyperus dives'' (Flora of Israel Online)
For a series of photographs
Cords and a fishnet from Cyperus & Scirpus
* {{Taxonbar, from=Q15532239 dives Taxa named by Alire Raffeneau Delile Flora of Africa Flora of the Indian subcontinent Flora of Palestine (region) Flora of Lebanon Flora of Syria Flora of Vietnam Plants described in 1813