| 词条 | Hulsea californica |
| 释义 |
|name = Hulsea californica |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Asterids |ordo = Asterales |familia = Asteraceae |genus = Hulsea |species = H. californica |binomial = Hulsea californica |binomial_authority = Torr. & Gray 1858 }} Hulsea californica is a rare species of flowering plant in the daisy family known by the common names San Diego alpinegold and San Diego sunflower. It is endemic to southern California, where it grows only in the Peninsular Ranges. The plant grows in open areas such as forest clearings and occurs in the chaparral, especially after wildfire. Most of its known populations are in San Diego County.[1] The main threat to this species are invasive plant species. DescriptionHulsea californica is a clumpy biennial herb producing greenish-gray to reddish erect stems of 40 centimeters (16 inches) to over a meter (40 inches) in height. The stems and foliage are hairy to densely woolly with thick coats of cobwebby fibers. Plants with thicker fibers are gray in color to nearly white. The abundant leaves are lance-shaped to scoop-shaped and up to 10 centimeters (4 inches) long, mostly without teeth along the edges but sometimes wavy or coarsely lobed.[2]The flower head is large with woolly lance-shaped phyllaries each over a centimeter (0.4 inches) long. The center of the head is packed with a large number of tiny deep yellow disc florets. This is surrounded by 22–40 yellow ray florets, each ray up to two centimeters (0.8 inches) long.[2] See also
References1. ^Calflora taxon report, University of California, Hulsea californica Torrey & A. Gray, San Diego alpinegold, San Diego sunflower 2. ^1 Flora of North America, Hulsea californica Torrey & A. Gray . 1858. San Diego alpinegold External links
3 : Hulsea|Endemic flora of California|Plants described in 1858 |
| 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。