Euphorbia ocellata subsp. rattanii

(S. Watson) Oudejans

Phytologia 67: 47. 1989.

Common names: Rattan’s sandmat
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
Treatment appears in FNA Volume 12. Treatment on page 280. Mentioned on page 279.

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.


Subspecies rattanii occurs in the Sacramento Valley in Colusa, Glenn, and Tehama counties.

Selected References


Lower Taxa

Victor W. Steinmann +, Jeffery J. Morawetz +, Paul E. Berry +, Jess A. Peirson +  and Ya Yang +
(S. Watson) Oudejans +
Euphorbia rattanii +
Rattan’s sandmat +
80–500 m. +
Roadsides, gravelly or sandy dry stream beds. +
Flowering and fruiting summer–fall, occasionally spring. +
Chamaesyce ocellata subsp. rattanii +, C. rattanii +  and E. ocellata var. rattanii +
Euphorbia ocellata subsp. rattanii +
Euphorbia ocellata +
subspecies +