| 词条 | Caltha natans |
| 释义 |
| image = Caltha natans.jpg | genus = Caltha | species = natans | authority = Pall. ex Georgi | synonyms = C. baicalensis, C. pusilla, Tacla ficarioides, Thacla natans | synonyms_ref = [1] }} Caltha natans is a species of flowering plant in the buttercup family. DescriptionUnlike other species of Caltha that are found in North America, C. natans shows relatively little morphological variation, and has not been divided into infraspecific taxa. The plants typically grow in shallow water, with floating leaves up to {{convert|25|mm}} wide and {{convert|50|mm|abbr=on}} long,[2] on a petiole (leaf stalk) up to {{convert|70|mm|abbr=on}} long.[3] The flowers are roughly {{convert|5|mm|abbr=on}} in diameter and have five white sepals; they are produced in late spring (June–August).[2] Each flower forms 20–55 follicles, which contain black, elliptic seeds {{convert|0.5|-|0.8|mm|abbr=on}} in diameter.[2][3] DistributionCaltha natans has an amphi-Beringian distribution, being found in both North America and East Asia. In Asia, it is found in Siberia, Mongolia and the Chinese provinces of Heilongjiang and Nei Mongol.[2] In North America, it is found in Alaska, the Canadian provinces of British Columbia, North West Territories, Yukon, Saskatchewan Alberta, Manitoba and Ontario, and in a small part of the contiguous United States (in the states of Minnesota and Wisconsin).[3]References1. ^{{cite web|website= The Plantlist|title= Caltha natans|url= http://www.theplantlist.org/tpl1.1/record/kew-2693847|accessdate= 2016-03-26}} 2. ^1 2 {{cite book |title=Caryophyllaceae through Lardizabalaceae |volume=6 |series=Flora of China |chapter=Caltha Linnaeus, Sp. Pl. 1: 558. 1753; Gen. Pl. ed. 5, 244; 1754 |author=Li Liangqian & Michio Tamura |pages=135–136 |isbn=1-930723-05-9 |url=http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=200007550 |accessdate=October 23, 2013}} 3. ^1 2 3 {{cite book |editor=Flora of North America Editorial Committee |year=1997 |title=Magnoliophyta: Magnoliidae and Hamamelidae |series=Flora of North America |volume=3 |chapter=Caltha Linnaeus, Sp. Pl. 1: 558. 1753; Gen. Pl. ed. 5, 244, 1754 |author=Bruce A. Ford |pages=187–189 |publisher=Oxford University Press |isbn=9780195112467 |url=http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=200007550 |accessdate=October 23, 2013}} External links
7 : Caltha|Flora of Eastern Asia|Flora of Inner Mongolia|Flora of Manchuria|Flora of Siberia|Flora of North America|Plants described in 1776 |
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