| 词条 | Arnica cordifolia |
| 释义 |
|image =Arnica cordifolia 1.jpg |image_caption=Arnica cordifolia near Chumstick Mountain, Chelan County Washington |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Asterids |ordo = Asterales |familia = Asteraceae |tribus = Heliantheae |genus = Arnica |species = A. cordifolia |binomial = Arnica cordifolia |binomial_authority = Hook. |synonyms_ref= |synonyms = {{collapsible list|bullets = true |title=Synonymy |Arnica abortiva Greene |Arnica andersonii Piper |Arnica austinae Rydb. |Arnica chionophila Greene |Arnica evermannii Greene |Arnica hardinae H.St.John |Arnica humilis Rydb. |Arnica macrophylla Nutt. |Arnica microphylla Walp. |Arnica paniculata A.Nelson |Arnica parviflora Greene 1901 not A.Gray 1868[1] |Arnica pumila Rydb. |Arnica subcordata Greene |Arnica whitneyi Fernald |}}}}Arnica cordifolia is a species of arnica in the sunflower family, known by the common name heartleaf arnica.[2] It is native to western North America from Alaska to California to New Mexico, as far east as Ontario and Michigan.[3] It is a plant of many habitat types, including coniferous forests and mountain meadows.[4] This is a rhizomatous perennial herb producing one or more erect stems reaching a maximum height near half a meter. It has two to four pairs of leaves on the stem, each on a long petiole. The leaves are heart-shaped to arrowhead-shaped and finely toothed along the edges. The inflorescence bears one or more daisylike flower heads lined with white-haired phyllaries and sometimes studded with resin glands. The center of each head contains golden yellow disc florets and a fringe of bright golden ray florets approaching 3 centimeters in maximum length.[4] The fruit is a hairy achene up to a centimeter long, not counting its off-white pappus. Seeds are dispersed on the wind. An individual plant can live twelve years, surviving periodic wildfire by resprouting from its long, slender rhizome afterward.[4][5] References1. ^The International Plant Names Index 2. ^Calflora taxon report, University of California, Arnica cordifolia Hook. heart leaved arnica, heartleaf arnica 3. ^Biota of North America Program 2014 state-level distribution map 4. ^1 2 Flora of North America Vol. 21 Page 374 Heartleaf arnica, Arnica cordifolia Hooker, Fl. Bor.-Amer. 1: 331. 1834. 5. ^Ecology Fire Ecology External links
8 : Arnica|Plants described in 1834|Flora of Subarctic America|Flora of Western Canada|Flora of the Northwestern United States|Flora of the Southwestern United States|Flora of New Mexico|Flora of Ontario |
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