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Scheuchzeria palustris L.

Brief Summary

    Scheuchzeria: Brief Summary
    provided by wikipedia

    Scheuchzeria palustris (Rannoch-rush, or pod grass), is a flowering plant in the family Scheuchzeriaceae, in which there is only one species and Scheuchzeria is the only genus. In the APG II system it is placed in the order Alismatales of the monocots.

Comprehensive Description

    Scheuchzeria
    provided by wikipedia

    Scheuchzeria palustris (Rannoch-rush,[2] or pod grass), is a flowering plant in the family Scheuchzeriaceae, in which there is only one species and Scheuchzeria is the only genus. In the APG II system it is placed in the order Alismatales of the monocots.[3]

    Description

    It is a herbaceous perennial plant, native to cool temperate regions of the Northern Hemisphere, where it grows in wet Sphagnum peat bogs. It grows to 10–40 cm tall, with narrow linear leaves alternating up the stem, with a basal sheath. The leaves can be up to 20 cm. The leaf tips are blunt with a conspicuous pore.[4]

    It has a creeping rhizome clothed in papery, straw coloured remains of old leaf bases.

    The flowers are greenish-yellow, 4–6 mm diameter, with six tepals. They have an inflated sheathing base, 6 stamens and 3 carpels. It flowers from June until August[5][6][7]

    There are two subspecies, not considered distinct by all authorities:[6][7][8]

    • Scheuchzeria palustris subsp. palustris. Northern and eastern Europe, northern Asia.
    • Scheuchzeria palustris subsp. americana (Fernald) Hultén. Northern North America.

    Etymology

    The genus is named after Johann Jakob Scheuchzer, a Swiss naturalist, and his brother, Johann Gaspar Scheuchzer.[9] The species name is from the Latin for a swamp.

    The English name refers to its occurrence on Rannoch Moor in central Scotland, the first site in Great Britain the species was known from, and only one where it currently occurs; it is extinct at a few other wetland sites further south in Britain, being found in pools and west hollows of ancient undisturbed Sphagnum bogs.[10][11]

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      Flowering plant

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      Stem with seeds, left; winter stem, right

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      1796 illustration

    References

    1. ^ Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III" (PDF). Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x. Retrieved 2013-07-06..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""'"'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
    2. ^ "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
    3. ^ L. Watson and M. J. Dallwitz (1992 onwards). The families of flowering plants: Scheuchzeriaceae
    4. ^ Rose, Francis (2006). The Wild Flower Key. Frederick Warne & Co. pp. 486–487. ISBN 978-0-7232-5175-0.
    5. ^ Flora of NW Europe: Scheuchzeria palustris[permanent dead link]
    6. ^ a b Flora of North America: Scheuchzeria palustris
    7. ^ a b Jepson Flora Project: Scheuchzeria palustris
    8. ^ USDA Plants Profile: Scheuchzeria palustris
    9. ^ Helmut Genaust (1983): Etymologisches Wörterbuch der botanischen Pflanzennamen, 2. Auflage. Birkhäuser Verlag - ISBN 3-7643-1399-4
    10. ^ Joint Nature Conservation Committee Rannoch Moor
    11. ^ Wildassociates: Scheuchzeria Archived 2005-05-07 at the Wayback Machine.

Distribution

    Distribution
    provided by eFloras
    Alta., B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Ont., Que., Sask., Yukon; Alaska, Calif., Conn., Idaho, Ill., Ind., Iowa, Maine, Mass., Mich., Minn., Mont., N.H., N.J., N.Y., N.Dak., Ohio, Oreg., Pa., R.I., Vt., Wash., W.Va., Wis.; Eurasia.

Morphology

    Comments
    provided by eFloras
    North American representatives of this species have been regarded as being varietally distinct from Eurasian plants on the basis of follicle and stigma characters (M. L. Fernald 1923). Variability in those characters, in specimens from both hemispheres, vitiates their worth for varietal distinction.
    Description
    provided by eFloras
    Herbs, glabrous. Rhizomes creeping, jointed, freely branching. Stems flexuous, zigzag, 1--4 dm. Leaves striate; cauline leaves gradually reduced to bracts; sheaths 1.5--10 cm, ligules 2--12 mm; hairs within leaf sheath 0.2--2 cm; blade 2--41 cm × 1--3 mm. Inflorescences 3--12-flowered, 3--10 cm; proximal bract foliaceous; distalmost sheaths sometimes bladeless; pedicels spreading, 5--25 mm. Flowers: tepals in 2 similar series of 3 each, white to yellow-green, lance-ovate to lanceolate, 1-veined, 2--3 mm, membranous, apex acute; filaments filiform; anthers linear, elongate; pistils 6--7 mm; styles oblong; stigmas papillose. Follicles light green to brown, ovoid, 4--10 mm, leathery, dehiscing on curved, adaxial side; beak 0.5--1 mm. Seeds brown to black, ovoid, 4--5 mm, smooth, hard; endosperm absent. 2n = 22.

Diagnostic Description

    Synonym
    provided by eFloras
    Scheuchzeria palustris var. americana Fernald; S. palustris subsp. americana (Fernald) Hultén; S. americana (Fernald) G. N. Jones

Habitat

    Habitat
    provided by eFloras
    Sphagnum bogs, marshes, and lake margins; 0--2000m.

Cyclicity

    Flowering/Fruiting
    provided by eFloras
    Flowering in late spring.