| 词条 | Helianthella microcephala |
| 释义 |
| name = Helianthella microcephala | image = | regnum = Plantae | unranked_divisio = Angiosperms | unranked_classis = Eudicots | unranked_ordo = Asterids | ordo = Asterales | familia = Asteraceae | subfamilia = Asteroideae | tribus = Heliantheae | genus = Helianthella | species = H. microcephala | binomial = Helianthella microcephala | binomial_authority = (A.Gray) A.Gray 1883 | synonyms_ref = [1] | synonyms = *Encelia microcephala A.Gray 1873 }}Helianthella microcephala, common name purpledisk helianthella,[2] is a North American plant species in the sunflower family. It grows in the southwestern United States, in the states of Arizona, New Mexico, Colorado, and Utah.[3][4]Helianthella microcephala is a herbaceous plant up to {{convert|80|cm|in|abbr=on}} tall. Leaves are up to {{convert|25|cm|in|abbr=on}} long. The plant usually produces 3-15 yellow flower heads per stem, in a flat-topped array. Each head contains 5-13 yellow ray flowers surrounding numerous dark brown or dark purple (almost black) disc flowers.[5] References1. ^The Plant List, Helianthella microcephala (A.Gray) A. Gray 2. ^{{PLANTS|id=HEMI2|taxon=Helianthella microcephala|accessdate=20 July 2015}} 3. ^Biota of North America Program 2014 county distribution map 4. ^SEINet, Southwestern Biodiversity, Arizona chapter includes photos, description, distribution map 5. ^Flora of North America, Helianthella microcephala (A. Gray) A. Gray 1883 External links{{Commons|Helianthella microcephala}}{{Taxonbar|from=Q15559338}}{{Heliantheae-stub}} 3 : Helianthella|Flora of the Southwestern United States|Plants described in 1873 |
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