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California coneflower, waxy cone-flower

clasping coneflower, clasping-leaf coneflower

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.

blades 3–15 × 0.5–4 cm.

Involucres

1–4 cm diam.

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.

Ray laminae

spreading, eventually reflexed, elliptic to obovate, 12–30 × 7–15 mm, abaxially hirsute.

Disc florets/Disc corollas

250–400+;

corollas yellowish green, 3–4 mm;

style branches ca. 1 mm, apices acute.

2.8–3.5 mm.

Phyllaries

to 1.5 cm.

spreading to reflexed, green, linear to lanceolate, herbaceous.

Heads

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

Cypselae

4–5.5 mm;

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

each face 4–5-striate and minutely cross-rugose, glabrous;

pappi 0 (cypselae each with ring of tan tissue at apex, ca. 0.1 mm).

Discs

15–35 × 14–22 mm.

2n

= 36.

= 32.

Rudbeckia glaucescens

Rudbeckia amplexicaulis

Phenology Flowering summer–fall. Flowering late spring–summer.
Habitat Meadows, seeps, streamsides Open sites, moist soils
Elevation 60–1300 m (200–4300 ft) 0–400 m (0–1300 ft)
Distribution
from FNA
CA; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; FL; GA; IL; KS; LA; MO; MS; ND; NM; OK; SC; TX
Discussion

Rudbeckia glaucescens often grows on serpentine and often with Darlingtonia.

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

Rudbeckia amplexicaulis grows mainly in the Gulf coastal plain and Mississippi Embayment. It may be adventive elsewhere. It is used in “native” meadow and roadside plantings and has become a problem in some agricultural crops.

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

Source FNA vol. 21, p. 48. FNA vol. 21, p. 46.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Rudbeckiinae > Rudbeckia > sect. Macrocline Asteraceae > tribe Heliantheae > subtribe Rudbeckiinae > Rudbeckia > sect. Dracopis
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. 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
Synonyms R. californica var. glauca Dracopis amplexicaulis
Name authority Eastwood: Leafl. W. Bot. 2: 55. (1937) Vahl: Skr. Naturhist. Selsk. 2(2): 29, plate 4. (1793)
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