© Copyright Sheryl Pollock 2011 · 8 Equisetum hyemale, Horsetail Click on map for details about points. IDnature guides Plant genera Taiwan Pteridophyta Links Associates Missouri Botanical Garden We parsed the following live from the Web into this page. Such content is managed by its original site and not cached on Discover Life. Please send feedback and corrections directly to the source. See original regarding copyrights and terms of use. Flora of North America 80x5 - 240x3 - 240x4 - 320x1 - 320x2 - 320x3 - 640x1 - 640x2 Set display option above. Click on images to enlarge. © Copyright source/photographer · 7 Equisetum hyemale, , Scouring Rush Horsetail, Howard County, Md, GFG, Helen Lowe Metzman © Copyright source/photographer · 7 Equisetum hyemale, , Scouring Rush Horsetail, Howard County, Md, GFG, Helen Lowe Metzman © Copyright source/photographer · 7 Equisetum hyemale, Scouring Rush Horsetail, Howard County, Md, GFG, Helen Lowe Metzman © Copyright source/photographer · 7 Equisetum hyemale, Tall Scouring Rush, Howard County, Md, GFG, Helen Lowe Metzman © Copyright Steve Baskauf, 2002-2011 · 4 Equisetum arvense, whole plant - unspecified © Copyright Steve Baskauf, 2002-2011 · 4 Equisetum arvense © Copyright Steve Baskauf, 2002-2011 · 4 Equisetum arvense © Copyright Steve Baskauf, 2002-2011 · 4 Equisetum arvense © Copyright Steve Baskauf, 2002-2011 · 4 Equisetum arvense, whole plant - unspecified © Copyright Steve Baskauf, 2002-2011 · 4 Equisetum hyemale, whole plant - unspecified © Copyright Steve Baskauf, 2002-2011 · 4 Equisetum hyemale © Copyright Steve Baskauf, 2002-2011 · 4 Equisetum hyemale © Copyright Steve Baskauf, 2002-2011 · 4 Equisetum hyemale © Copyright Steve Baskauf, 2002-2011 · 4 Equisetum hyemale, whole plant - unspecified see all kinds   •  341 thumbnails  •  slide show Kinds Equisetum arvense, Field Horsetail Equisetum bogotense Equisetum fluviatile, Water Horsetail Equisetum giganteum Equisetum hyemale, Rough Horsetail Equisetum laevigatum, Smooth horsetail Equisetum litorale Equisetum myriochaetum, Mexican giant horsetail Equisetum nelsonii Equisetum palustre, Marsh Horsetail Equisetum praealtum Equisetum pratense, Shady Horsetail Equisetum ramosissimum, Branched Horsetail Equisetum scirpoides, Dwarf scouringrush Equisetum sylvaticum, Wood Horsetail Equisetum telmateia, Great Horsetail Equisetum trachyodon Equisetum variegatum, Variegated Horsetail Equisetum x_ferrissii Equisetum x_litorale Equisetum x_mackaii Equisetum x_nelsonii Supported by National Biological Information Infrastructure National Science Foundation Associates · map Family Scientific name @ source (records) Cixiidae   Cixius cultus @ AMNH_IZC (10) go to Discover Life's Facebook group Following modified from Flora of North America    Top | See original   All Floras       Advanced Search FNA Vol. 2 Login | eFloras Home | Help FNA | Family List | FNA Vol. 2 | Equisetaceae 1. Equisetum Linnaeus, Sp. Pl. 2: 1061. 1753; Gen. Pl. ed. 5, 484, 1754. Horsetail, scouring rush, prêle [Latin equis, horse, and seta, bristle, referring to the coarse black roots of E . fluviatile ] Richard L. Hauke Equisetum ramosissimum Credit: Harvard University Herbaria Plants perennial, rhizomatous. Aerial stems annual or perennial. Stems with hollow center and series of small carinal (under the ridges) and larger vallecular (under the valleys) canals. Leaves in whorls, fused part of length into sheaths. Stem ridges traversing length of internode and continuing into sheaths, terminating in sheath teeth. Branches when present borne at nodes, erupting through base of subtending sheath. Cones terminal on green stems or, in some species, terminating special, reproductive, brown stems, composed of whorls of peltate sporophylls; cone apices rounded or sharply pointed; sporangia 5--10 per sporophyll, pendent, attached to inner surface of sporophylls, elongate, dehiscing longitudinally. x =108. Species 15 (11 in the flora): nearly worldwide. Equisetum occurs in moist places such as riverbanks, lakeshores, roadsides, ditches, seepage areas, meadows, marshes, and wet woodlands. Aerial stems of Equisetum vary considerably in habit and appearance, even on individual plants, because of environmentally induced modifications affecting height and branching. Many taxonomically trivial varieties and forms have been named. For an extended discussion of this, see R.L. Hauke (1966). Four widespread, named hybrids are treated in the key and fully described below. In species descriptions and in the key, length and width are given for the leaf sheath, excluding the free teeth. If the length and width of flattened sheaths are approximately equal and the sides are straight, the sheath is more or less square in face view, i.e., about as long as broad; if the length is greater than the width and the sides are straight, the sheath is more or less elongate in face view, i.e., longer than broad; if the length is greater than the width and the sides are slightly convex, the sheath is elliptic in face view. Stomates are usually visible at 20× magnification. Reticulation in Equisetum is summarized in the reticulograms, which show the known and expected hybrids in North America. Most of those in Equisetum subg. Equisetum are still unknown in North America, but they should be sought, especially north of 45° N latitude. According to W.J. Cody and D.M. Britton (1989), E . × font-queri occurs rarely in British Columbia and materials possibly representing E . × arcticum Rothmaler have been taken in the Richardson Mountain region of Mackenzie. R.L. Hauke (1978) cited collections of E . × font-queri from British Columbia and California. SELECTED REFERENCES Hauke, R.L. 1966. A systematic study of Equisetum arvense . Nova Hedwigia 13: 81--109. Hauke, R.L. 1979. Equisetum ramosissimum in North America. Amer. Fern J. 69: 1--5. (Key to species of Equisetum) Updated: 2024-05-04 22:01:07 gmt Discover Life | Top © Designed by The Polistes Corporation