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FNA | Family List | FNA Vol. 20 | Asteraceae | Heterotheca

3d. Heterotheca oregona (Nuttall) Shinners var. scaberrima (A. Gray) Semple, Brittonia. 39: 383. 1987.

Chrysopsis oregona (Nuttall) A. Gray var. scaberrima A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1(2): 124. 1884

Stems usually branched distally, densely, coarsely stipitate-glandular. Leaves green to dark green, mid cauline averaging 13.9 × 3.9 mm (9.2–19.4 × 2.2–7.8 mm); branch leaves glabrate to sparsely hispid (fewer than 5 hairs/mm²), moderately to densely coarsely glandular. Outer phyllaries narrowly to broadly ovate. 2n = 18.

Flowering Jul–Oct. Sand and gravel soils, gravel bars, along arroyos, flood plains of streams in dry oak woods and grassy hills; 100–700 m; Calif.

Variety scaberrima is found in the inner Coast Ranges. Its branches tend to be longer on average; the arrays are thus rather large and open compared to undamaged plants of the other varieties. The smaller leaves of much branched and few-headed specimens of var. rudis can result in a habit similar to that of var. scaberrima. This could create confusion in identity if the ovate outer phyllaries of the latter are overlooked.


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