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Rudbeckia alpicola

showy black-eyed susan, showy coneflower, Washington, Washington showy black-eyed susan, Wenatchee coneflower, Wenatchee Mountain, Wenatchee Mountain showy black-eyed susan, Wenatchee Mountains coneflower

brown-eyed susan, thin-leaf coneflower, three-leaf coneflower, three-lobed coneflower

Habit Perennials, to 150 cm (rhizomes stout, plants not colonial, roots fibrous). Perennials, to 150 cm (rhizomatous).
Stems

glabrate to hirsute or strigose (hairs 1–2 mm, basal retrorse, others spreading).

Leaves

green, ovate to elliptic or deltate, pinnate to pinnatifid or lyrate-pinnatifid, herbaceous, faces moderately to densely hairy (hairs 1-seriate);

basal petiolate, 25–70 × 8–45 cm, lobes 3–9, bases rounded to acute, apices acute;

cauline petiolate or sessile, 12–50 × 5–40 cm, bases attenuate to cuneate, ultimate margins dentate to lobed, apices acute.

blades ovate to subcordate or elliptic (not lobed), margins serrate, apices acute to acuminate, faces hirsute to strigose;

basal petiolate, 10–30 × 2–8 cm, bases truncate or rounded to cordate;

cauline petiolate or sessile, ovate to elliptic, proximal usually 3–5-lobed, 2–20 × 1.5–8 cm (smaller, fewer lobed distally), bases rounded to attenuate, sometimes clasping.

Receptacles

columnar;

paleae 5–7 mm, apices obtuse to acute, often apiculate, abaxial tips hairy.

conic to subhemispheric;

paleae 5–6.5 mm, apices cuspidate (tips awnlike, 1.5+ mm), glabrous.

Ray florets

0.

8–15;

laminae (corollas yellow to yellow-orange with basal maroon splotches) linear to oblanceolate, 8–30 × 3–8 mm, abaxially sparsely strigose.

Disc florets

300–500;

corollas brown-purple, 4.2–5.8 mm;

style branches ca. 2 mm, apices acute.

150–300+;

corollas yellowish green basally, otherwise brown-purple, 3–4 mm;

style branches ca. 1.2 mm, apices obtuse to rounded.

Phyllaries

to 6 cm (foliaceous, faces scabrous).

to 1.5 cm (faces moderately hirsute).

Heads

borne singly or (2–10) in ± corymbiform arrays.

(10–30) in paniculiform arrays.

Cypselae

3.5–5 mm;

pappi of 4 scales, to 1 mm.

1.9–2.8 mm;

pappi coroniform, to 0.2 mm.

Discs

30–80 × 18–30 mm.

8–15 × 10–20 mm.

Rudbeckia alpicola

Rudbeckia triloba

Phenology Flowering mid summer–fall.
Habitat Thickets, bogs, along streams
Elevation 200–1500 m (700–4900 ft)
Distribution
from FNA
WA
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; CO; CT; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MN; MO; MS; NC; NE; NJ; NY; OH; OK; PA; TN; TX; UT; VA; VT; WI; WV; ON; QC
[WildflowerSearch map]
[BONAP county map]
Discussion

Of conservation concern.

Rudbeckia alpicola is known only from Chelan and Kittitas counties.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Varieties 3 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Cauline leaves (at least some) 5–7-lobed (Florida, Kentucky, North Carolina, Virginia)
var. pinnatiloba
1. Cauline leaves (at least some) 3-lobed
→ 2
2. Ray laminae 8–17 mm; discs 10–15 mm diam. (20–100 m; relatively widespread)
var. triloba
2. Ray laminae 18–30 mm; discs 15–20 mm diam. (100–1200 m; Iowa, Kentucky, North Carolina, Tennessee)
var. rupestris
Source FNA vol. 21, p. 47. FNA vol. 21, p. 59.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Rudbeckiinae > Rudbeckia > sect. Macrocline Asteraceae > tribe Heliantheae > subtribe Rudbeckiinae > Rudbeckia > sect. Rudbeckia
Sibling taxa
R. amplexicaulis, R. auriculata, R. californica, R. fulgida, R. glaucescens, R. graminifolia, R. grandiflora, R. heliopsidis, R. hirta, R. klamathensis, R. laciniata, R. maxima, R. missouriensis, R. mohrii, R. mollis, R. montana, R. nitida, R. occidentalis, R. scabrifolia, R. subtomentosa, R. texana, R. triloba
R. alpicola, R. amplexicaulis, R. auriculata, R. californica, R. fulgida, R. glaucescens, R. graminifolia, R. grandiflora, R. heliopsidis, R. hirta, R. klamathensis, R. laciniata, R. maxima, R. missouriensis, R. mohrii, R. mollis, R. montana, R. nitida, R. occidentalis, R. scabrifolia, R. subtomentosa, R. texana
Subordinate taxa
R. triloba var. pinnatiloba, R. triloba var. rupestris, R. triloba var. triloba
Synonyms R. occidentalis var. alpicola
Name authority Piper: Erythea 7: 173. (1899) Linnaeus: Sp. Pl. 2: 907. (1753)
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