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!Eleocharis R. Br. Search in The Plant ListSearch in IPNISearch in Australian Plant Name IndexSearch in Index Nominum Genericorum (ING)Search in NYBG Virtual HerbariumSearch in JSTOR Plant ScienceSearch in SEINetSearch in African Plants Database at Geneva Botanical Garden Decrease font Increase font Restore font
 

Published In: Prodromus Florae Novae Hollandiae 1: 224. 1810. (Prodr.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: A genus with c. 150 cosmopolitan species; represented in Pakistan by c. 10 species.

 

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Annual or perennial plants. Rhizome often sturdy, horizontal, frequently producing stolons, which may end with tuber or bulbil. Leaves reduced; lowest open sheaths loosely surrounding stem base, scarious, soon disintegrating; above them two closed sheaths tightly surrounding stem base; blades 0; ligule 0. Inflorescence a single spike, glumes spirally arranged, all fertile or lowest 1-2 sterile. Flowers bisexual; perianth bristles 3 to 8, conspicuous or small, retrorsely barbed, occasionally absent; stamens 3-2; stigmas 2-3; stylopodium persistent on top of mature nut, distinguished by its softer, often spongy texture, in most cases bulbous and clearly separated from nut by constriction. Nut 0.5-2.5 mm, excl. stylopodium, trigonous or lenticular. Eleocharis resembles Schoenoplectus in having reduced leaf blades, characteristically, there are two closed sheaths at stem base and inflorescence is a single spike. Style base is swollen as in Abildgaardia and Fimbristylis, but in these genera the stylopodium is caducous, in Eleocharis it persists. The style base in E. quinqueflora is conical and stylopodium tissue is visible only when wet. The small stylopodium of Bulbostylis may be persistent, but Abildgaardia, Fimbristylis and Bulbostylis species all have well-developed leaf blades. Trichophorum is also unispikate, but characterized by short leaf blades and by absence of stylopodium. For subgeneric division, see Kukkonen, Ann. Bot. Fennici 27: 109-117. 1990, Gonzalez-Elizondo & Peterson, Taxon 46: 433-499. 1997.
 

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1 (1) Annuals or perennials forming small tufts. (1)
+ Perennials with horizontal rhizome or stolons. (2)
2 (1) Stem more than 0.5 mm diam.; glumes not in protruding spiral rows, 1.5-2.2 mm, midnerve not very strong; perianth bristles 6-8, longer than or equalling nut; nuts 0.8-1 mm. (3)
+ Stem less than 0.5 mm diam.; glumes in 5 spiral rows, 1.1- 1.6 mm, with strong, green midnerve; perianth bristles 4- 7, shorter than or equalling nut; nuts 0.6-0.8 mm. 9 Eleocharis atropurpurea
3 (2) Basal glume fertile, not distinct from other glumes; stigmas 2; stylopodium much wider than long. 10 Eleocharis geniculata
+ Basal glume sterile, larger than the other; stigmas 3; stylopodium as long as wide or longer. 8 Eleocharis congesta
4 Mostly less robust plants, up to 1 m, stem not septate. (5)
+ Robust perennial, up to 1.4 m, stem septate. 1 Eleocharis dulcis
5 (4) Stem terete or, at most, obscurely angular, 0.2-3 mm diam., stylopodium shorter, less than 1 mm. (6)
+ Stem sharply angular, slender, 0.5-1 mm diam.; stylopodium 1.1-1.2 mm. 7 Eleocharis tetraquetra
6 (5) Plants (5-)15-100 cm, stem 1-5 mm diam., terete, style base bulbous stylopodium. (7)
+ Plants 3-30 cm, stem 0.2-0.75 mm diam., terete or obscurely angular, style base not distinctly bulbous. 6 Eleocharis quinqueflora
7 (6) Base of spikes with two more or less equal, sterile glumes. (8)
+ Base of spikes a single clasping, sterile glume. 5 Eleocharis uniglumis
8 (7) Plants 20-100 cm; perianth bristles 4(-5), equalling the nut; stylopodium 0.4-0.9 x 0.4-0.8 mm, as wide as long. (9)
+ Plants to c. 30 cm; perianth bristles 0-4, to equalling nut; stylopodium 0.4-0.5 x 0.7- 0.8 mm, wider than long. 2 Eleocharis argyrolepis
9 (8) Vascular bundles in cross section 12-28; spikes 9-25 x 3-5 mm; glumes c. 50 or more, 2.5-3.5 mm. 4 Eleocharis palustris
+ Vascular bundles in cross section 37-38; spikes 15-30 x 4-7 mm; glumes c. 100, 3.5-4.5 mm. 3 Eleocharis mitracarpa
 
 
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