| 词条 | Helenium quadridentatum |
| 释义 |
| image = Actes de la société d'histoire naturelle de Paris - tome premier, premiere partie (1792) (16585970589).jpg | regnum = Plantae | unranked_divisio = Angiosperms | unranked_classis = Eudicots | unranked_ordo = Asterids | ordo = Asterales | familia = Asteraceae | tribus = Helenieae | genus = Helenium | species = H. quadridentatum | binomial = Helenium quadridentatum | binomial_authority = Labill. 1792 | synonyms_ref = [1] | synonyms = *Heleniastrum quadridentatum (Labill.) Kuntze
}}Helenium quadridentatum is a North American plant in the sunflower family, commonly known as Longdisk sneezeweed.[2] It is found in the southeastern and south-central United States (Alabama, Mississippi, Louisiana, Texas, Oklahoma)[2] as well as Mexico (from Tamaulipas to Yucatán), Cuba, Guatemala, and Belize.[2][3][4][5]Helenium quadridentatum is an annual herb up to {{convert|100|cm|in|round=0.5|abbr=on}} tall, with small wings running down the sides of the stems. Leaves are sometimes broadly elliptical, other times very narrow and grass-like. One plant generally produces up to 50 flower heads, in a branching array. Each head has an egg-shaped or conical disc containing can have 500 or more minuscule disc flowers each {{convert|1.1|–|1.8|mm|in|abbr=on}} across, each yellow toward the bottom but yellow-brown toward the tip. There are also 10-15 yellow ray flowers.[6][7][8] References1. ^The Plant List, Helenium quadridentatum Labill. 2. ^Biota of North America Program 2014 county distribution map 3. ^Balick, M. J., M. H. Nee & D.E. Atha. 2000. Checklist of the vascular plants of Belize. Memoirs of The New York Botanical Garden 85: i–ix, 1–246 4. ^Turner, B. L. 2013. The comps of Mexico. A systematic account of the family Asteraceae (chapter 11: tribe Helenieae). Phytologia Memoirs 16: 1–100 5. ^EcuRed, Enciclopedia cubana 6. ^1 2 Flora of North America, Helenium quadridentatum Labillardière, 1792. Longdisk sneezeweed 7. ^[https://www.biodiversitylibrary.org/page/45494803#page/56/mode/1up Labillardière, Jacques Julien Houtou de. 1792. Actes de la Société d'Histoire Naturelle de Paris 1: pages 22-23] diagnosis in Latin, description + commentary + figure captions in French 8. ^[https://www.biodiversitylibrary.org/page/45494803#page/173/mode/1up Labillardière, Jacques Julien Houtou de. 1792. Actes de la Société d'Histoire Naturelle de Paris 1: plate IV (4)] full-page line drawing of Helenium quadridentatum External links{{Commons category|position=left}}{{Taxonbar|from=Q15558957}}{{Asteroideae-stub}} 3 : Flora of North America|Plants described in 1792|Helenium |
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