Polygonum sawatchense subsp. oblivium
Family: Polygonaceae · Type: annual · Native
Polygonum sawatchense subsp. oblivium is a California native annual found in northwestern California, high Cascade Range, northern and central Sierra Nevada, and Warner Mountains in dry to moist meadows, pastures, and forests at elevations of 1,000 to 3,100 meters. Flowering from June to August, this plant produces green-white or green-yellow flowers flushed with purple, clustered in small axillary groups with 1 to 3 blossoms. Growing with slender stems 5 to 15 centimeters tall, occasionally reaching 25 centimeters, with a papillate-scabrous green surface. Its leaves are persistent and gradually reduced along the stem, with elliptic to oblong-elliptic blades 8 to 20 millimeters long, featuring flat margins with fine papillate teeth. The fruit is a small elliptic to elliptic-ovate structure measuring 2.6 to 3.3 millimeters long.
Habitat: Dry, moist meadows, pastures, forest, sandy, gravelly, rocky substrates
Bloom period: Jun-Aug
Elevation: 1000-3100 m
Bioregions: NW, CaRH, n&c SNH, Wrn
California counties: Placer, Plumas, Mono, Siskiyou, Shasta, Modoc, Nevada, Lassen, Mariposa, Butte, Tuolumne, Humboldt, El Dorado, Trinity
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Jepson eFlora, Cal-IPC, and more.