| 词条 | Stephanomeria diegensis |
| 释义 |
|image = Stephanomeriadiegensis1.jpg |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Asterids |ordo = Asterales |familia = Asteraceae |tribus = Cichorieae |subtribus = Microseridinae |genus = Stephanomeria |species = S. diegensis |binomial = Stephanomeria diegensis |binomial_authority = Gottlieb |}} Stephanomeria diegensis is a species of flowering plant in the aster family known by the common name San Diego wirelettuce.[1] It is native to the coastal hills and ranges of southern California and Baja California, where it grows in many types of open habitat. It evolved as a hybrid of Stephanomeria exigua and S. virgata.[2] Furthermore, it is thought to be the result of homoploid hybrid speciation, which is uncommon.[3] The plant is frequently misidentified as one of its parents, especially if older taxonomic keys are used.[4] This is an erect annual herb easily exceeding two meters in height. Its slender stem has many spreading branches. The basal leaves are linear to lance-shaped and up to 10 centimeters long. The leaves wither early and are absent for most of the year, giving the plant a twiglike appearance. Leaves on the upper stem are small and reduced. The inflorescences are usually clusters of flower heads located at intervals on the stiff branches. Each head has a cylindrical base lined with phyllaries. These are often glandular. The head contains several ray florets, each with an elongated tube and a white or pink-tinged ligule measuring around a centimeter long. The fruit is a grooved achene tipped with a spreading cluster of long, plumelike pappus bristles. References1. ^{{PLANTS|id=STDI6|taxon=Stephanomeria diegensis|accessdate=2 December 2015}} 2. ^Gallez, G. P. and L. D. Gottlieb. (1982). Genetic evidence for the hybrid origin of the diploid plant Stephanomeria diegensis. Evolution 36:6 1158-67. 3. ^Sherman, N. A. & J. M. Burke. (2009). Population genetic analysis reveals a homoploid hybrid origin of Stephanomeria diegensis (Asteraceae). Mol Ecol 18:19 4049-60. 4. ^Chester, T. S. diegensis: An analysis External links
3 : Stephanomeria|Flora of Baja California|Flora of California |
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