| 词条 | Iva hayesiana |
| 释义 |
|image = Ivahayesiana.JPG |status = G3 |status_system = TNC |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Asterids |ordo = Asterales |familia = Asteraceae |genus = Iva |species = I. hayesiana |binomial = Iva hayesiana |binomial_authority = Gray 1876 |}} Iva hayesiana is a species of flowering plant in the daisy family known by the common names San Diego marsh-elder and San Diego povertyweed. It is native to northwestern Baja California and southern California, in San Diego, Orange, Los Angeles, Ventura, and San Bernardino Counties.[1] DescriptionIva hayesiana is a shrubby perennial herb approaching one meter (40 inches) in height. Its green oval-shaped leaves are fleshy, glandular, aromatic, and 3 to 6 centimeters (1.2-2.4 inches) long.[2]The flowers are nearly invisible; male flowers have translucent corollas and simple yellow stamens and female flowers, if they occur, lack corollas altogether. This is a plant of mineral-rich waterways such as intermittent streams and alkali flats.[2] ConservationThreats to the plant include development of coastal habitat and waterways.[3] It is a {{C|Vulnerable flora of California|Vulnerable flora species in California}}.
This species is recommended for use as an ornamental plant in fire-resistant landscaping in Southern California.[4] References1. ^Calflora taxon report, University of California, Iva hayesiana A. Gray San Diego marsh elder, San Diego povertyweed 2. ^1 Flora of North America, Iva hayesiana A. Gray, 1876. 3. ^Iva hayesiana. NatureServe. 2012. 4. ^Fire, plants, defensible space and you. County of San Diego, Department of Planning and Land Use. 2004. External links
6 : Heliantheae|Flora of Baja California|Flora of California|Natural history of the California chaparral and woodlands|Natural history of San Diego County, California|Plants described in 1876 |
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