Heterotheca oregona var. scaberrima

(A. Gray) Semple

Brittonia 39: 383. 1987.

Endemic
Basionym: Chrysopsis oregona var. scaberrima A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1(2): 124. 1884
Treatment appears in FNA Volume 20. Treatment on page 237. Mentioned on page 236.

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.


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

Discussion

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.

Selected References

None.

Lower Taxa

None.
John C. Semple +
(A. Gray) Semple +
Chrysopsis oregona var. scaberrima +
100–700 m +
Sand and gravel soils, gravel bars, along arroyos, flood plains of streams in dry oak woods and grassy hills +
Flowering Jul–Oct. +
Chrysopsis oregona +
Heterotheca oregona var. scaberrima +
Heterotheca oregona +
variety +