| 词条 | Hazardia detonsa |
| 释义 |
|image = Hazardiadetonsa.jpg |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Asterids |ordo = Asterales |familia = Asteraceae |tribus = Astereae |genus = Hazardia |species = H. detonsa |binomial = Hazardia detonsa |binomial_authority = (Greene) Greene 1887 |synonyms_ref=[1] |synonyms=
|}}Hazardia detonsa is a rare species of shrub in the daisy family known by the common name island bristleweed.[2] It is endemic to the Channel Islands of California, having been found on 4 islands (Santa Rosa, Santa Cruz, West Anacapa, and Middle Anacapa).[3] Hazardia detonsa is a bushy shrub reaching {{convert|60|cm}} to {{convert|2.5|m}} in height. It has densely woolly, glandular herbage of thick, serrated, oval-shaped leaves up to {{convert|14|cm}} long. At the ends of its whitish stems it produces bell-shaped flower heads each about a centimeter long. Each flower head has several rows of white woolly phyllaries and an open end revealing disc florets and longer protruding ray florets. The florets are yellow and may age to red or purple.[4] The main threat to this species on Santa Cruz Island was the presence of feral Santa Cruz sheep. The sheep have been removed, allowing the plant to begin its recovery there. References1. ^The Plant List, Hazardia detonsa (Greene) Greene 2. ^{{cite web|url=http://plants.usda.gov/java/profile?symbol=HADE4|title=Hazardia detonsa (Greene) Greene Island bristleweed|publisher=Plants Profile|work=USDA|accessdate=March 25, 2008}} 3. ^Calflora taxon report, University of California, Hazardia detonsa (E. Greene) E. Greene, Northern islands hazardia, island bristleweed, island hazardia, northern island haplopappus 4. ^Flora of North America, Hazardia detonsa (Greene) Greene, 1887. Island bristleweed External links
8 : Astereae|Endemic flora of California|Natural history of the Channel Islands of California|Natural history of the California chaparral and woodlands|Natural history of Santa Barbara County, California|Natural history of Ventura County, California|Plants described in 1883|Taxa named by Edward Lee Greene |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。