|Leaves and flowers (detail)|
|Subgenus:||Prunus subg. Prunus|
|Section:||Prunus sect. Prunocerasus|
|Natural range of Prunus subcordata|
Prunus subcordata, known by the common names Klamath plum, Oregon plum, Pacific plum and Sierra plum, is a member of the genus Prunus, native to the western United States in California and western and southern Oregon. It grows in forests, most often at low elevation near the coast, but it is also in the Sierra Nevada and Cascades; it grows at altitudes of 100–1,900 m. P. subcordata var. subcordata, Klamath plum, is also found in Washington.
The range of Prunus subcordata surrounds the San Joaquin Valley, especially the western flank foothills of the Sierra Nevada range, but avoids the coast mountains of the southwest San Joaquin Valley. For other Pacific coastal Prunus species, P. emarginata is also found in the Pacific Northwest states; P. fremontii and P. ilicifolia are found in coastal or mountain areas of southwest California and northern Baja California.
Prunus subcordata is an erect deciduous shrub or small tree growing to 8 m (nearly 27 feet) in height. It sprouts from its roots and can form dense, spiny thickets. The bark is gray with horizontal brown lenticels, similar in appearance to that of the cultivated cherry tree. The leaves are 2.5–5 cm (1-2 inches) long with a 4–15 mm (0.16-0.60 inch) petiole, dark green, turning red before falling, and are faintly toothed. The flowers are white or pinkish, appearing in the spring in clusters of one to seven together. The fruit is a small, plum-like drupe, variable in appearance, 15–25 mm (0.60-1.00 inch) in length, and may be red or yellow; they mature in late summer. The plums are small and tart but edible.
The three main common names are related to the plum's mountain ranges and locales.
|Wikimedia Commons has media related to Prunus subcordata.|
- "Prunus subcordata". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 14 October 2015.
- Little Jr., Elbert L. (1976). "Map 126, Prunus subcordata". Atlas of United States Trees. 3 (Minor Western Hardwoods). US Government Printing Office. LCCN 79-653298. OCLC 4053799.
- Jepson Manual. University of California: Prunus subcordata
- USDA Plants Profile: Prunus subcordata
- Biota of North America Program 2014 county distribution map
- Calflora taxon report, University of California, Prunus subcordata Benth. Klamath plum, Sierra plum
- Little Jr., Elbert L. (1976). "Maps 121, 122, and 123, P. fremontiii, emarginata, ilicifolia". Atlas of United States Trees. 3 (Minor Western Hardwoods). US Government Printing Office. LCCN 79-653298. OCLC 4053799.
- Casebeer, M. (2004). Discover California Shrubs. Sonora, California: Hooker Press. ISBN 0-9665463-1-8
- Flora of North America, Prunus subcordata Bentham, 1849. Sierra or Klamath or Pacific plum
- Chesnut, Victor King (1902). Plants used by the Indians of Mendocino County, California. Government Printing Office. p. 405. Retrieved 24 August 2012.