Heterotheca oregona

(Nuttall) Shinners

Field & Lab. 19: 71. 1951.

Common names: Oregon goldenaster
Endemic
Basionym: Ammodia oregona Nuttall Trans. Amer. Philos. Soc., n. s. 7: 321. 1840
Synonyms: Chrysopsis oregona (Nuttall) A. Gray
Treatment appears in FNA Volume 20. Treatment on page 236. Mentioned on page 230, 231, 232.

Perennials, 15–105 cm; caudices branched. Stems ascending to erect (sometimes ± brittle, sometimes brown), glabrate to densely hispid or densely stipitate-andular (axillary leaf fascicles sometimes present). Leaves: basal and proximal cauline withering by flowering; sessile; mid and distal blades ovate to linear-lanceolate, 12–50 × 4–40 mm, rounded to very weakly clasping, margins flat, strigoso-ciliate, apices acute, faces glabrate to densely hairy and/or stipitate-glandular; branch leaves reduced. Heads (discoid) 1–15 per branch, in corymbiform, openly paniculiform, or racemiform arrays. Peduncles 5–50 mm, sparsely to densely hispid, stipitate-glandular; bracts linear to narrowly lanceolate, 3–9 × 0.5–2 mm. Involucres turbino-cylindric, 7.5–14 mm. Phyllaries in 5–7 series, outer ovate to deltate (2–5 × 0.6–1.7 mm), inner lanceolate, unequal, abaxial faces sparsely to densely hispid or stipitate-glandular (in green zone). Ray-florets 0. Disc-florets (14–) 20–45 (–60); corollas ± ampliate, (7.5–) 8.5–11 (–14) mm, throats and lobes sparsely short-pilose, lobes 0.4–0.9 mm (margins thickened). Cypselae monomorphic, obconic, compressed, 2–5 × 0.35–1.6 mm, ribs 5–10, faces sparsely strigose; pappi tan, outer of linear scales 0.1–0.5 mm (not obvious), inner of 30–40 bristles 4.5–6.4, longest weakly clavate. 2n = 18.

Discussion

varieties 4 (4 in the flora

Varieties 4 (4 in the flora).

Selected References

None.

Key

1 Distal stems densely, coarsely stipitate-glandular; mid cauline leaves averaging 13.9 × 3.9 mm (9.2–19.4 × 2.2–7.8 mm); outer phyllaries narrowly to broadly ovate; inner Coast Ranges, California Heterotheca oregona var. scaberrima
1 Distal stems sparsely to moderately, coarsely stipitate-glandular, or moderately to densely, finely stipitate-glandular; mid cauline leaves averaging 22–32 × 4.7–9.1 mm (1.5–42.5 × 2.1–36.3 mm); outer phyllaries lanceolate; Cascades to Coastal ranges, Washington to c California > 2
2 Stems usually branched proximally; leaves gray-green, long-villous (200–1000+ m in moun-tains, n California) Heterotheca oregona var. compacta
2 Stems usually openly branched distally; leaves green, glabrate to moderately hispid > 3
3 Stems moderately to densely, finely stipitate-glandular; branch leaves glabrate to sparsely hispid (fewer than 5 hairs/mm²), moderately stipitate-glandular; Olympic Peninsula and Cascades to Coastal ranges (n, c California) Heterotheca oregona var. oregona
3 Stems sparsely to moderately coarsely stipitate-glandular; branch leaves moderately short-hispid (more than 5 hairs/mm²), sparsely to moderately, coarsely stipitate-glandular; coast to lower mountains, s Oregon, n California Heterotheca oregona var. rudis

"[" is not declared as a valid unit of measurement for this property."]" is not declared as a valid unit of measurement for this property.

... more about "Heterotheca oregona"
stipitate-glandular +  and hispid +
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
racemiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
John C. Semple +
(Nuttall) Shinners +
decurrent +
Ammodia oregona +
compound +  and simple +
rugulose +  and muricate +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
linear +  and narrowly lanceolate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
barbellulate +  and barbellate +
Oregon goldenaster +
not 2-lipped +  and actinomorphic +
1.1 cm11 mm <br />0.011 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
ampliate +
0.85 cm8.5 mm <br />0.0085 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
compressed +  and obconic +
0.035 cm0.35 mm <br />3.5e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
fertile +  and bisexual +
Calif. +, Oreg. +  and Wash. +
strigose +, glabrate +  and densely hairy and/or stipitate-glandular +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
paniculiform +
in corymbiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
tan;rusty brown +
attenuate +  and clavate +
turbino-cylindric +
0.75 cm7.5 mm <br />0.0075 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
cauline +, proximal +  and basal +
erect;spreading +
short-pilose +
lanceolate +, triangular +  and deltate +
serrate +  and entire +
stipitate-glandular +  and strigose +
1.2 cm12 mm <br />0.012 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (4 cm40 mm <br />0.04 m <br />) +
2-carpellate +
in 3 +  and 4 series +
stipitate-glandular +  and hispid +
0.5 cm5 mm <br />0.005 m <br /> (5 cm50 mm <br />0.05 m <br />) +
lanceolate +  and linear-lanceolate +
ovate-oblanceolate +
Field & Lab. +
bearing subulate enations +, hairy +  and bristly +
subulate;convex +
5 +  and 10 +
3 +  and 40 +
linear +  and linear-lanceolate or triangular +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
exalbuminous +
ascending +  and erect +
appendaged +  and truncate +
papillate +  and smooth +
Chrysopsis oregona +
Heterotheca oregona +
Heterotheca +
species +
short-pilose +
60 cm600 mm <br />0.6 m <br /> (200 cm2,000 mm <br />2 m <br />) +
15 cm150 mm <br />0.15 m <br /> (105 cm1,050 mm <br />1.05 m <br />) +
tree +, shrub +  and subshrub +