familyEuphorbiaceae
genusEuphorbia
sectionEuphorbia sect. Anisophyllum
speciesEuphorbia ocellata
subspeciesEuphorbia ocellata subsp. rattanii
Euphorbia ocellata subsp. rattanii
Phytologia 67: 47. 1989.
Common names: Rattan’s sandmat
Endemic
Basionym: Euphorbia rattanii S. Watson Proc. Amer. Acad. Arts 20: 372. 1885
Synonyms: Chamaesyce ocellata subsp. rattanii (S. Watson) Koutnik C. rattanii (S. Watson) Millspaugh E. ocellata var. rattanii (S. Watson) L. C. Wheeler
Stems 10–22 cm, pilose. Leaves: stipules 1–1.5 mm, pilose; petiole 0.9–2 mm, pilose; blade 4.2–9.5 × 2.7–5 mm, apex acute to obtuse, surfaces pilose; lateral veins visible abaxially on larger leaves. Peduncle 1–2.2 mm. Involucre 2–2.5 × 1.7–2.4 mm, pilose; gland appendages present. Pistillate flowers: ovary pilose. Capsules 1.9–2.4 × 2–3.1 mm, pilose; columella 1.6–2 mm. Seeds pale gray to black, oblong, 1.6–1.7 × 0.8–1.2 mm, rugose.
Phenology: Flowering and fruiting summer–fall, occasionally spring.
Habitat: Roadsides, gravelly or sandy dry stream beds.
Elevation: 80–500 m.
Discussion
Subspecies rattanii occurs in the Sacramento Valley in Colusa, Glenn, and Tehama counties.
Selected References
None.
Lower Taxa
None.