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California coneflower, waxy cone-flower

little river black-eyed susan, sunfacing coneflower

Habit Perennials, to 150 cm (roots fibrous). Perennials, to 120 cm (rhizomatous).
Stems

villous to glabrate.

Leaves

bluish green (heavily glaucous), blades lanceolate to elliptic (not lobed), leathery, bases attenuate, margins entire or remotely serrulate, apices acute, faces glabrous;

basal petiolate, 20–50 × 4–10 cm;

cauline petiolate or sessile, 10–25 × 2–8 cm.

blades elliptic, lanceolate, or ovate (flat, not lobed), bases acute to rounded or cuneate, margins entire or serrate, apices acute, faces glabrous or sparsely strigose and gland-dotted;

basal petiolate, blades 10–20 × 2–5 cm;

cauline petiolate (proximal) or nearly sessile (distal), blades 2–20 × 1–4 cm.

Receptacles

conic to columnar;

paleae 4–6.5 mm, apices acute, often attenuate, abaxial tips hairy.

hemispheric to ovoid;

paleae 3.2–4.2 mm, apices rounded to acute, abaxial tips canescent and gland-dotted.

Ray florets

7–15;

laminae elliptic to oblong, 25–40 × 8–14 mm, abaxially hairy.

6–12;

laminae elliptic to oblanceolate (spreading), 15–30 × 3–6 mm, abaxially strigose and gland-dotted.

Disc florets

250–400+;

corollas yellowish green, 3–4 mm;

style branches ca. 1 mm, apices acute.

100–200+;

corollas proximally yellowish green, distally brown-purple, 3–4 mm;

style branches ca. 1.4 mm, apices obtuse.

Phyllaries

to 1.5 cm.

to 1.5 cm (faces sparsely to moderately hairy and gland-dotted).

Heads

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

usually (4–8) in ± corymbiform arrays, sometimes borne singly.

Cypselae

4–5.5 mm;

pappi coroniform or of ± connate scales, to 1.2 mm.

2–3 mm;

pappi coroniform, to 1.5 mm (sometimes cypselae each with glandular hairs around apices).

Discs

15–35 × 14–22 mm.

10–15 × 7–15 mm.

2n

= 36.

Rudbeckia glaucescens

Rudbeckia heliopsidis

Phenology Flowering summer–fall. Flowering summer–fall.
Habitat Meadows, seeps, streamsides Mesic to wet woodlands, meadows
Elevation 60–1300 m (200–4300 ft) 70–200 m (200–700 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; GA; NC; SC; VA
[BONAP county map]
Discussion

Rudbeckia glaucescens often grows on serpentine and often with Darlingtonia.

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

Of conservation concern.

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

Source FNA vol. 21, p. 48. FNA vol. 21, p. 56.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Rudbeckiinae > Rudbeckia > sect. Macrocline Asteraceae > tribe Heliantheae > subtribe Rudbeckiinae > Rudbeckia > sect. Rudbeckia
Sibling taxa
R. alpicola, R. amplexicaulis, R. auriculata, R. californica, R. fulgida, 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. 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
Synonyms R. californica var. glauca
Name authority Eastwood: Leafl. W. Bot. 2: 55. (1937) Torrey & A. Gray: Fl. N. Amer. 2: 310. (1842)
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