''Ceanothus leucodermis'', with the common names chaparral whitethorn or chaparral white thorn, is a species of

shrub A shrub or bush is a small to medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees by their multiple ...

in the family

Rhamnaceae The Rhamnaceae are a large Family (biology), family of flowering plants, mostly trees, shrubs, and some vines, commonly called the buckthorn family. Rhamnaceae is included in the order Rosales. The family contains about 55 genera and 950 specie ...

. This '' Ceanothus'' is an importance browse for several types of

ungulate Ungulates ( ) are members of the diverse clade Euungulata ("true ungulates"), which primarily consists of large mammals with Hoof, hooves. Once part of the clade "Ungulata" along with the clade Paenungulata, "Ungulata" has since been determined ...

, such as the

mule deer The mule deer (''Odocoileus hemionus'') is a deer indigenous to western North America; it is named for its ears, which are large like those of the mule. Two subspecies of mule deer are grouped into the black-tailed deer. Unlike the related whit ...

and

bighorn sheep The bighorn sheep (''Ovis canadensis'') is a species of Ovis, sheep native to North America. It is named for its large Horn (anatomy), horns. A pair of horns may weigh up to ; the sheep typically weigh up to . Recent genetic testing indicates th ...

, who prefer the new growth and shoots to the older, spiny parts.

Range and habitat

It is native to

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

and

Baja California Baja California, officially the Free and Sovereign State of Baja California, is a state in Mexico. It is the northwesternmost of the 32 federal entities of Mexico. Before becoming a state in 1952, the area was known as the North Territory of B ...

, where it grows in coastal and inland mountain habitat, such as

chaparral Chaparral ( ) is a shrubland plant plant community, community found primarily in California, southern Oregon, and northern Baja California. It is shaped by a Mediterranean climate (mild wet winters and hot dry summers) and infrequent, high-intens ...

coniferous forest Conifers () are a group of cone-bearing seed plants, a subset of gymnosperms. Scientifically, they make up the division Pinophyta (), also known as Coniferophyta () or Coniferae. The division contains a single extant class, Pinopsida. All e ...

, and oak woodland.

Description

''Ceanothus leucodermis'' is a thorny shrub growing erect to heights approaching 4 meters. The bark is gray-white, waxy, and somewhat hairy, especially when new. The twigs harden into sharp-tipped thorns as they age.Forest Service Fire Ecology
/ref> The evergreen leaves are alternately arranged, oval in shape and up to about 4 centimeters long. The edges are smooth or lined with tiny glandular teeth. Leaves are covered with a delicate, white powdery coating that can be rubbed off.

Stipules In botany, a stipule is an outgrowth typically borne on both sides (sometimes on just one side) of the base of a leafstalk (the petiole). They are primarily found among dicots and rare among monocots. Stipules are considered part of the anatomy ...

, the small leaf-like structures on the stem at the base of the stem of the leaf ( petiole), are thin and fall off early, compared to other members of the genus.Flowering Plants of the Santa Monica Mountains, Nancy Dale, 2nd Ed., 2000, p. 167 The

inflorescence In botany, an inflorescence is a group or cluster of flowers arranged on a plant's Plant stem, stem that is composed of a main branch or a system of branches. An inflorescence is categorized on the basis of the arrangement of flowers on a mai ...

is a long, stalked cluster of flowers in shades of blue, lavender, or white. The fruit is a sticky, three-lobed capsule about half a centimeter long. Fruits do not have horns, as do some other members of this genus.

References

External links

Jepson Manual Treatment - ''Ceanothus leucodermis''USDA Plants Profile: Ceanothus leucodermis''Ceanothus leucodermis'' — U.C. Photo gallery
leucodermis Flora of California Flora of Baja California Plants described in 1895 {{Rhamnaceae-stub