| 词条 | Helianthus pumilus |
| 释义 |
|regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Asterids |ordo = Asterales |familia = Asteraceae |genus = Helianthus |species = H. pumilus |binomial = Helianthus pumilus |binomial_authority =Nutt. 1841 }}Helianthus pumilus is a North American species of sunflower known by the common name little sunflower[1] or bush sunflower.[1] It is found in the western United States, primarily the Rocky Mountain region of Montana, Wyoming, and Colorado, with a few isolated populations in Utah and Idaho.[2]Helianthus pumilus grows on dry rocky soil in the mountains and nearby plains. It is a perennial herb up to 100 cm (40 inches) tall. One plant usually produces 1-6 flower heads, each containing 8-13 yellow ray florets surrounding 30 or more yellow or brown disc florets.[3][4] References1. ^United States Department of the Interior, National Park Service, Rocky Mountain National Park, Bush Sunflower helianthus pumilus 2. ^Biota of North America Program 2014 county distribution map 3. ^1 Flora of North America, Helianthus pumilus Nuttall, 1841. Little sunflower 4. ^[https://www.biodiversitylibrary.org/page/36318087#page/388/mode/1up Nuttall, Thomas 1841. Transactions of the American Philosophical Society, new series 7: 366–367] External links
3 : Helianthus|Flora of the Western United States|Plants described in 1841 |
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