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Isoëtes
Family: Isoetaceae
Isoëtes image
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CANOTIA 5(1)
PLANT: Perennial herbs, heterosporous. ROOTS: adventitious, arising from between the stem lobes, unbranched or branched. STEMS: usually 2-lobed, stout, short, fleshy, cormlike, with reduced internodes, lobed. LEAVES: usually numerous, deciduous, appearing tufted, linear, tapered to the sharply pointed tip, glabrous, hollow (with 4 longitudinal chambers) with a single midvein, the base broadened and convex (spoon-shaped), bearing 1 sporangium in a shallow pit on the adaxial (inner) side and a thin scale (ligule) adjacent and distal to the sporangium. SPORANGIA: of 2 types, usually on the same plant, thin-walled, lacking an annulus, breaking open irregularly through decay, partially covered along the margin by a flap of tissue (velum), some with numerous megaspores, others with numerous microspores. MEGASPORANGIA: with 50-300 megaspores. MEGASPORES: relatively large, much bigger than the dust-like microspores, trilete, globose. MICROSPORANGIA: with 150,000 or more microspores. MICROSPORES: monolete, bean-shaped. GAMETOPHYTES: reduced, developing inside the spores, the archegonia and antheridia protruding from the spore wall. —1 genus, ca. 150 spp., nearly worldwide. NOTES: (Greek for “equal” and “year” [evergreen]). Species of quillworts are often overlooked in the field, because of their superficial similarity to some aquatic species of grasses, sedges, and rushes. REFERENCES: Windham, M. D. and G. Ytskievych. 2009. Vascular Plants of Arizona: Isoëtaceae. CANOTIA 5 (1): 27-29.
Vascular plants of NE US and adjacent Canada
Perennial, mostly aquatic or amphibious herbs with linear, grass-like lvs; x=11. 100+, cosmop. Hybrids are not infrequent. Some such are I. إatonii R. Dodge = I. echinospora נengelmannii; I. ئoveolata A. A. Eaton = I. riparia נtuckermanii; and I. بarveyi A. A. Eaton = I. lacustris נtuckermanii; I. بickeyi W. C. Taylor & Luebke = I. echinospora נlacustris.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
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Show all taxa || << 1 - 50 taxa >>
Isoëtes acadiensis
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Isoetes alpina
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Isoetes andicola
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Isoëtes appalachiana
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Isoëtes azorica
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Isoëtes bolanderi
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Isoetes boliviensis
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Isoëtes boomii
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Isoëtes boryana
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Isoëtes braunii
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Isoëtes brittonii
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Isoëtes bruntonii
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Isoëtes butleri
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Isoëtes canadensis
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Isoëtes capensis
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Isoëtes caroliniana
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Isoëtes chapmanii
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Isoëtes coromandeliana
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Isoëtes coromandelina
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Isoetes cubana
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Isoetes dodgei
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Isoëtes duriei
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Isoëtes eatonii
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Isoëtes echinospora
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Isoetes ekmanii
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Isoëtes engelmannii
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Isoëtes flaccida
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Isoëtes flettii
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Isoëtes foveolata
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Isoëtes georgiana
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Isoëtes gravesii
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Isoëtes gunnii
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Isoëtes hawaiiensis
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Isoëtes hieroglyphica
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Isoetes histrix
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Isoëtes howellii
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Isoëtes hyemalis
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Isoetes jamaicensis
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Isoetes japonica
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Isoëtes junciformis
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Isoetes killipii
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Isoëtes lacustris
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Isoetes laurentiana
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Isoetes lechleri
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Isoëtes lithophila
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Isoetes longissima
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Isoëtes louisianensis
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Isoëtes macrospora
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Isoëtes maritima
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Isoëtes mattaponica
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The National Science Foundation
Developments of SEINet, Symbiota, and associated specimen databases have been supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)