| 词条 | Ceanothus greggii |
| 释义 |
|image = Ceanothus greggii 4.jpg |regnum = Plantae |unranked_divisio = Angiosperms |unranked_classis = Eudicots |unranked_ordo = Rosids |ordo = Rosales |familia = Rhamnaceae |genus = Ceanothus |species = C. greggii |binomial = Ceanothus greggii |binomial_authority = A.Gray |}} Ceanothus greggii, with the common name desert ceanothus, is a species of shrub in the buckthorn family, Rhamnaceae. DistributionIt is native to the Southwestern United States, California, New Mexico, Texas, and northern Mexico. It grows in desert scrub, sagebrush, chaparral, and other dry habitats such as inland mountain slopes, at elevations of {{convert|1000|m|abbr=on}} to {{convert|2300|m|abbr=on}} .[1] It was named for its collector Josiah Gregg, who found the plant in 1847 at the site of the Battle of Buena Vista in the state of Coahuila, in northern Mexico during the Mexican-American War by Asa Gray of Harvard University in 1853.[1] DescriptionCeanothus greggii is a many-branched shrub that grows erect to nearly {{convert|2|m|ft|abbr=on}} in maximum height. Its woody parts are gray in color and somewhat woolly. Branches are opposite and rigid.[2]The evergreen leaves are oppositely arranged, 2 to 9mm long, and variable in shape, with a prominent midvein. They may be toothed or smooth along the edges, and are indeed usually somewhat cupped (see top image).[2] The inflorescence is a small (less than 2 cm long) cluster of many white flower, on short lateral branchess. It blooms in spring.[1][2] Blooms are considered highly fragrant.[3] The fruit is a horned capsule a few millimeters wide which bursts explosively to expel the three seeds which require thermal scarification from wildfire before they can germinate.[4]
This shrub is eagerly browsed by livestock and wild ungulates such as mule deer and desert bighorn sheep.[4] VarietiesVarieties include:[5][6]
See also
References1. ^1 Blakely, Larry, Desert Ceanothus, Ceanothus greggii A. Gray var. vestitus (E. Greene) McMinn (Rhamnaceae) {{webarchive |url=https://web.archive.org/web/20110606232428/http://www.csupomona.edu/~larryblakely/whoname/who_grgg.htm |date=June 6, 2011 }}, Who's in a Name? People Commemorated in Eastern Sierra Plant Names 2. ^1 2 3 {{cite book |author1=John D. Stuart |author2=John O. Sawyer |author3=Andrea J. Pickart |title=Trees and Shrubs of California |year=2001 |publisher=University of California Press |isbn=978-0-520-22110-9}} 3. ^{{cite web|url=http://www.fireflyforest.com/flowers/2786/ceanothus-greggii-desert-ceanothus/|title=Ceanothus greggii – Desert Ceanothus – Southeastern Arizona Wildflowers and Plants|website=Fireflyforest.com|accessdate=15 September 2018}} 4. ^1 {{cite web|url=http://www.fs.fed.us/database/feis/plants/shrub/ceagre/all.html|title=Species: Ceanothus greggii|website=Fs.fed.us|accessdate=15 September 2018}} 5. ^USDA: Subordinate taxa of Ceanothus greggii 6. ^[https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=28473 ITIS Standard Report Page: Ceanothus greggii] 7. ^{{cite journal|author=S.L. Welsh|title=New taxa and new nomenclatural combinations in the Utah flora|journal=Rhodora|volume=95|date=1993|url=https://www.biodiversitylibrary.org/page/33106321#page/423/mode/1up}} External links{{commonscat-inline|Ceanothus greggii}}
15 : Ceanothus|Flora of California|Flora of Northeastern Mexico|Flora of Northwestern Mexico|Flora of the South-Central United States|Flora of the Southwestern United States|Flora of the California desert regions|Flora of the Sierra Nevada (U.S.)|North American desert flora|Natural history of the California chaparral and woodlands|Natural history of the Mojave Desert|Natural history of the Peninsular Ranges|Natural history of the Transverse Ranges|Plants described in 1853|Taxa named by Asa Gray |
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