Rudbeckia glaucescens |
Rudbeckia grandiflora |
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California coneflower, waxy cone-flower |
largeflower coneflower, rough coneflower |
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Habit | Perennials, to 150 cm (roots fibrous). | Perennials, to 120 cm (roots fibrous, caudices often woody). | ||||
Stems | proximally glabrous or sparsely hairy (hairs spreading), distally strigose (hairs ascending). |
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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 (± conduplicate, not lobed), bases cuneate to rounded, margins entire or remotely serrate, apices acute, faces strigose, abaxially gland-dotted; basal petiolate, 10–35 × 2–11 cm; cauline petiolate (proximal) to nearly sessile (distal), 4–30 × 1.5–9 cm. |
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Receptacles | conic to columnar; paleae 4–6.5 mm, apices acute, often attenuate, abaxial tips hairy. |
hemispheric to ovoid; paleae 5–6.5 mm, (apical margins glabrous) acuminate-cuspidate, awn-tipped, abaxial tips sparsely strigose. |
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Ray florets | 7–15; laminae elliptic to oblong, 25–40 × 8–14 mm, abaxially hairy. |
12–25; laminae elliptic to obovate (reflexed), 20–50 × 5–10 mm, abaxially hairy and gland-dotted. |
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Disc florets | 250–400+; corollas yellowish green, 3–4 mm; style branches ca. 1 mm, apices acute. |
200–800+; corollas greenish yellow basally and in lobes, otherwise maroon, 3.5–5 mm; style branches ca. 1.8 mm, apices obtuse. |
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Phyllaries | to 1.5 cm. |
to 15 mm (strigose and gland-dotted). |
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Heads | borne singly or (2–10) in ± corymbiform arrays. |
mostly borne singly. |
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Cypselae | 4–5.5 mm; pappi coroniform or of ± connate scales, to 1.2 mm. |
2–3 mm; pappi coroniform, to 0.5 mm. |
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Discs | 15–35 × 14–22 mm. |
10–30 × 15–25 mm. |
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2n | = 36. |
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Rudbeckia glaucescens |
Rudbeckia grandiflora |
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Phenology | Flowering summer–fall. | |||||
Habitat | Meadows, seeps, streamsides | |||||
Elevation | 60–1300 m (200–4300 ft) | |||||
Distribution |
CA; OR
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AR; GA; IL; KS; KY; LA; MO; MS; OH; OK; TX; Mostly c, e, and s United States
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Discussion | Rudbeckia glaucescens often grows on serpentine and often with Darlingtonia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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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 | ||||||
Subordinate taxa | ||||||
Synonyms | R. californica var. glauca | Centrocarpha grandiflora | ||||
Name authority | Eastwood: Leafl. W. Bot. 2: 55. (1937) | (Sweet) C. C. Gmelin ex de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 556. (1836) | ||||
Web links |