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California coneflower, waxy cone-flower

Habit Perennials, to 150 cm (roots fibrous).
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.

Receptacles

conic to columnar;

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

Ray florets

7–15;

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

Disc florets

250–400+;

corollas yellowish green, 3–4 mm;

style branches ca. 1 mm, apices acute.

Phyllaries

to 1.5 cm.

Heads

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

Cypselae

4–5.5 mm;

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

Discs

15–35 × 14–22 mm.

2n

= 36.

Rudbeckia glaucescens

Phenology Flowering summer–fall.
Habitat Meadows, seeps, streamsides
Elevation 60–1300 m (200–4300 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Rudbeckia glaucescens often grows on serpentine and often with Darlingtonia.

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

Source FNA vol. 21, p. 48.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Rudbeckiinae > Rudbeckia > sect. Macrocline
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
Synonyms R. californica var. glauca
Name authority Eastwood: Leafl. W. Bot. 2: 55. (1937)
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