Ceanothus greggii

Ceanothus greggii, with the common name desert ceanothus, is a species of shrub in the buckthorn family, Rhamnaceae.

Ceanothus greggii
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Rosids
Order:	Rosales
Family:	Rhamnaceae
Genus:	Ceanothus
Species:	C. greggii
Binomial name
Ceanothus greggii A.Gray

Distribution

Ceanothus greggii bush on mountainside at 7,000 ft (2,100 m)

It is native to the Southwestern United States, Arizona, 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 1,000 m (3,300 ft) to 2,300 m (7,500 ft).[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.[2]

Description

Ceanothus greggii is a many-branched shrub that grows erect to nearly 2 m (6.6 ft) in maximum height. Its woody parts are gray in color and somewhat woolly. Branches are opposite and rigid.[1]

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).[1]

The inflorescence is a small (less than 2 cm long) cluster of many white flower, on short lateral branchess. It blooms in spring.[2][1] 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]

Wildlife

This shrub is eagerly browsed by livestock and wild ungulates such as mule deer and desert bighorn sheep.[4]

Varieties

Varieties include:[5][6]

• Ceanothus greggii var. franklinii – desert ceanothus, endemic to Grand and San Juan Counties, Utah.[7]
• Ceanothus greggii var. greggii – desert ceanothus
• Ceanothus greggii var. perplexans – Gregg's ceanothus
• Ceanothus greggii var. vestitus – Mojave ceanothus

See also

• California chaparral and woodlands
• Mojave Desert
• Sky island

References

1. John D. Stuart; John O. Sawyer; Andrea J. Pickart (2001). Trees and Shrubs of California. University of California Press. ISBN 978-0-520-22110-9.
2. Blakely, Larry, Desert Ceanothus, Ceanothus greggii A. Gray var. vestitus (E. Greene) McMinn (Rhamnaceae) Archived June 6, 2011, at the Wayback Machine, Who's in a Name? People Commemorated in Eastern Sierra Plant Names
3. "Ceanothus greggii – Desert Ceanothus – Southeastern Arizona Wildflowers and Plants". Fireflyforest.com. Retrieved 15 September 2018.
4. "Species: Ceanothus greggii". Fs.fed.us. Retrieved 15 September 2018.
5. USDA: Subordinate taxa of Ceanothus greggii
6. ITIS Standard Report Page: Ceanothus greggii
7. S.L. Welsh (1993). "New taxa and new nomenclatural combinations in the Utah flora". Rhodora. 95.

External links

Media related to Ceanothus greggii at Wikimedia Commons

• Calflora Database: Ceanothus greggii (desert ceanothus)
• Jepson Manual treatment of Ceanothus greggii
• USDA Plants Profile for Ceanothus greggii (desert ceanothus)
• UC Photos gallery — Ceanothus greggii