Heterotheca oregona

Oregon Goldenaster

Heterotheca oregona (Nutt.) Shinners is a rayless species native to Cascade Mts. and Coastal Ranges from Washington south to central California. The species is diploid (2n=18). See Semple (2006 FNA).

Heteotheca oregona morphology after Semple et al 1988

Four varieties were recognized by Semple et al (1988) and Semple (2006):

var. compacta (D.D. Keck) Semple
var. oregona
var. rudis (Greene) Semple
var. scaberrima (A. Gray) Semple

Heterotheca oregona var. oregona, northern California

var. rudis, heads, northern California

Heterotheca oregona var. rudis, heads, Semple 5687, Mendocino Co., California

Heterotheca oregona scaberrima 8588

Heterotheca oregona var. scaberrima, Semple & Heard 8588, Santa Clara Co., California

var. scaberrima, Coastal Range, central California

Heterotheca oregona var. scaberrima, Semple & Heard 8600, Santa Clara Co., California

Semple, J.C., C. Leeder, C. Leuty and L. Gray. 1988. Heterotheca sect. Ammodia (Compositae: Astereae): a multivariate study of H. oregona and specimens of Brewer's (golden)aster. Syst. Bot. 13: 547-558.

Last update 22 May 2023 by J.C. Semple