''Trifolium howellii'' is a species of

clover Clovers, also called trefoils, are plants of the genus ''Trifolium'' (), consisting of about 300 species of flowering plants in the legume family Fabaceae originating in Europe. The genus has a cosmopolitan distribution with the highest diversit ...

known by the common names canyon clover and Howell's clover. It is native to

Oregon Oregon ( , ) is a U.S. state, state in the Pacific Northwest region of the United States. It is a part of the Western U.S., with the Columbia River delineating much of Oregon's northern boundary with Washington (state), Washington, while t ...

and

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 ...

, where it grows in moist and shady habitat types, such as

swamp A swamp is a forested wetland.Keddy, P.A. 2010. Wetland Ecology: Principles and Conservation (2nd edition). Cambridge University Press, Cambridge, UK. 497 p. Swamps are considered to be transition zones because both land and water play a role in ...

s and forest streambanks.

Description

It is a perennial herb growing erect with hairless herbage. The leaf blades are made up of large oval leaflets each measuring up to 10 centimeters long, and large

stipule 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 (botany), petiole). They are primarily found among dicots and rare among monocots. Stipules are considered part ...

s which may be over 2 centimeters long. 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 round or elongated head of flowers up to 3 centimeters long, the flowers spreading out and drooping with age. Each flower has a greenish or pinkish corolla measuring one centimeter long or more.

References

External links

Jepson Manual TreatmentPhoto gallery
howellii Flora of California Flora of Oregon Flora of the Klamath Mountains Natural history of the California Coast Ranges Flora without expected TNC conservation status {{Trifolieae-stub