| 词条 | Carex riparia |
| 释义 |
| image = CarexRiparia1.jpg | display_parents = 2 | genus = Carex | parent = Carex sect. Paludosae | species = riparia | authority = Curtis }} Carex riparia, the greater pond sedge, is a species of sedge found across Europe and Asia. It grows in a variety of wet habitats, and can be a dominant species in some swamps. It is Britain's largest Carex, growing up to {{convert|130|cm|ftin|abbr=on}} tall, with glaucous leaves up to {{convert|160|cm|ftin|abbr=on}} long. It hybridises with a number of other Carex species, including the closely related Carex acutiformis – the lesser pond sedge. A variegated cultivar is grown as an ornamental grass. Distribution and habitatCarex riparia has a broad distribution over Europe and Western and Central Asia, with isolated occurrences in North Africa.[1] It can form large stands along slow-flowing rivers, canals, on the edges of lakes, and in wet woodland.[2] It may be the dominant species in swamps, especially if there is standing water in spring, and is also found in tall-herb fens, alongside Carex acutiformis, Carex acuta and other similar species.[3]DescriptionCarex riparia was first described by William Curtis in his 1783 work Flora Londinensis.{{#tag:ref|Many North American sources erroneously attribute the species to M. A. Curtis.|group=Note}}[1] It is easily confused with Carex acutiformis, the lesser pond sedge, but can be told apart by its greater number of male spikes, which grow close together at the top of the culm.[3]The leaves of C. riparia are up to {{convert|160|cm}} long by {{convert|6|-|20|mm}} wide, glaucous, and narrowing at the tip to a trigonous point.[3] The stems are {{convert|60|-|130|cm|abbr=on}} tall, rough, and sharply triangular in section,[3] making C. riparia Britain's largest species of Carex.[3] They bear 1–5 female spikes, each nearly cylindrical and generally overlapping with the next, and 3–6 more densely arranged male spikes.[3] Each female spike is {{convert|3|-|10|cm|abbr=on}} long, often with some male flowers at the tip, while male spikes are {{convert|2|-|6|cm|1|abbr=on}} long.[3] The fruits of C. riparia are utricles, {{convert|5|-|8|mm|1|abbr=on}} long, with an inflated ovoid shape. They taper to a distinct, bifid beak, which bears three stigmas.[3] Carex riparia is known to hybridise with a number of other sedge species, including Carex acutiformis (forming Carex × sooi), C. lasiocarpa (forming C. × evoluta), C. rostrata (forming C. × beckmanniana), C. vesicaria (forming C. × csomadensis), C. elata and C. flacca.[4]HorticultureCarex riparia, particularly the cultivar 'Variegata', is used as an ornamental grass in gardens with wet soils.[5]Notes1. ^1 {{GRIN | accessdate=May 11, 2011}} 2. ^{{cite book |editor1=C. D. Preston |editor2=D. A. Pearman |editor3=T. D. Dines |year=2002 |title=New Atlas of the British and Irish Flora |chapter=Carex riparia |author1=M. J. Y. Foley |author2=M. S. Porter |page=722 |publisher=Oxford University Press |isbn=978-0-19-851067-3}} 3. ^{{cite book |editor=Hugh Chisholm |year=1911 |title=Cyperaceae |url=http://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica/Cyperaceae |work=Encyclopædia Britannica |publisher=Cambridge University Press |edition=11th}} 4. ^1 2 3 4 5 6 7 {{cite book |author1=A. C. Jermy |author2=D. A. Simpson |author3=M. J. Y. Foley |author4=M. S. Porter |year=2007 |title=Sedges of the British Isles |edition=3rd |series=BSBI Handbook No. 1 |isbn=978-0-901158-35-2 |publisher=Botanical Society of the British Isles |chapter=Carex riparia Curtis |pages=304–306}} 5. ^{{cite book |author=John Simmons |year=2008 |title=Managing the Wet Garden: Plants that Flourish in Problem Places |publisher=Timber Press |isbn=978-0-88192-900-3 |chapter=Carex |pages=188–190 |url=https://books.google.com/books?id=M97r_dOmp_MC&pg=PA189}} References{{Reflist|32em}}External links{{Commons category|Carex riparia|Carex riparia}}
4 : Carex|Flora of Europe|Flora of Asia|Plants described in 1783 |
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