Sphenopsida


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Noun 1. Sphenopsida - horsetails and related forms
division Pteridophyta, Pteridophyta - containing all the vascular plants that do not bear seeds: ferns, horsetails, club mosses, and whisk ferns; in some classifications considered a subdivision of Tracheophyta
Equisetales, order Equisetales - lower tracheophytes in existence since the Devonian
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Equisetum is an ancient genus and comprises the sole surviving representatives of the class Sphenopsida (the only class of the subdivision Sphenophytina) (Scagel et al., 1984).
Biology and functional ecology of Equisetum with emphasis on the giant horsetails
Characeae N SPHENOPSIDA Equisetum bogotense Equisetaceae N Kunth FILICOPSIDA Blechnum penna-marina Blechnaceae N (Poir.) Kuhn Isoetes savatieri Franch.
Macrophytes assemblages in mountain lakes of Huerquehue National Park (39[degrees]S, Araucania Region, Chile)/Ensambles de macrofitas en lagos de montana del Parque Nacional Huerquehue (39[grados]S, Region de la Araucania, Chile
61-100 1909-1958 1959-1978 Algae 46 (3) 2 Fungi 74 20 (5) Lichens 4 0 Bryophytes 11 (4) 34 Lycopsida 20 1 Psilopsida 1 0 Sphenopsida 8 (1) 0 Pteropsida 52 (5) 0 Incertae sedis 13 (1) 0 Spermatophyta Gymnosperms 7 0 Angiosperms Monocotyledons 57 9 Dicotyledons 725 (9) 31 (1) TABLE 4.-Numbers of citations of selected terms in the subject indices of two cumulative index volumes Volumes 1-60 Volumes 61-100 1909-1958 1959-1978 A.
The American Midland Naturalist: the life history of a journal

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