Sericocarpus oregonensis

Nuttall

Trans. Amer. Philos. Soc., n. s. 7: 302. 1840.

Common names: Oregon white-topped aster
Endemic
Synonyms: Aster oregonensis (Nuttall) Cronquist
Treatment appears in FNA Volume 20. Treatment on page 104. Mentioned on page 103.

Plants 24–102 cm. Stems erect, hairy. Leaves basal and proximal-most cauline withering by flowering; cauline sessile; blades broadly lanceolate to narrowly ovate, 10–100 × 3–20 mm, margins entire, apices acuminate to acute, faces hairy. Heads 2–4 per branch, in corymbiform arrays. Peduncle bracts broadly lanceolate to narrowly ovate, hairy. Involucres 5–7 mm at flowering. Phyllaries in 3–4 series, puberulent, outer series 3–5 mm, mid series 4–6 mm. Ray florets 2–6; straps 3–6 mm, corolla tubes 3–4 mm. Disc florets 9–20; corolla tubes 3–5 mm, lobes 1–2 mm. Ovaries fusiform, 1–3 mm, strigose; pappi: inner series 5–7 mm.

Discussion

Subspecies 2 (2 in the flora).

Selected References

None.

Key

1 Stems and leaves sparsely hairy Sericocarpus oregonensis subsp. oregonensis
1 Stems and leaves moderately to densely hairy Sericocarpus oregonensis subsp. californicus