Rudbeckia glaucescens |
Asteraceae tribe Heliantheae subtribe Rudbeckiinae |
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California coneflower, waxy cone-flower |
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Habit | Perennials, to 150 cm (roots fibrous). | Annuals, biennials, or perennials, 20–300 cm. | ||||
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. |
basal and cauline or mostly cauline; alternate; petiolate or sessile; blades mostly deltate, elliptic, lanceolate, linear, lyrate, oblanceolate, oblong, ovate, pandurate, or spatulate, often 1–2-pinnately lobed or -pinnatifid, ultimate margins entire, dentate, serrate, or toothed, faces glabrous or hairy, often gland-dotted. |
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Involucres | hemispheric to rotate. |
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Receptacles | conic to columnar; paleae 4–6.5 mm, apices acute, often attenuate, abaxial tips hairy. |
subhemispheric, ovoid, conic, or columnar (8–70+ mm high), paleate (paleae strongly conduplicate, each partly investing its subtended floret). |
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Ray florets | 7–15; laminae elliptic to oblong, 25–40 × 8–14 mm, abaxially hairy. |
0 or 3–25+, neuter; corollas yellow or orange, brown-purple, maroon, or reddish, sometimes bicolor (orange, brown-purple, maroon, or reddish plus yellow, laminae often drooping or reflexed). |
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Disc florets | 250–400+; corollas yellowish green, 3–4 mm; style branches ca. 1 mm, apices acute. |
50–800+, bisexual, fertile; corollas yellowish green to yellow or brown-purple, tubes shorter than or equaling funnelform or cylindric throats, lobes 5, deltate to triangular or obovate; anther thecae dark; stigmatic papillae in 2 lines. |
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Phyllaries | to 1.5 cm. |
persistent, (5–)15–30+ in 1–3 series (distinct, elliptic, lanceolate, linear, ovate, or triangular, usually subequal, sometimes unequal, outer longer, all herbaceous, distally or throughout, or inner scarious, at least outer soon reflexed). |
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Calyculi | 0. |
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Heads | borne singly or (2–10) in ± corymbiform arrays. |
usually radiate, sometimes discoid, borne singly or in loose, ± corymbiform or paniculiform arrays. |
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Cypselae | 4–5.5 mm; pappi coroniform or of ± connate scales, to 1.2 mm. |
subterete, or obpyramidal and 4-angled, or strongly compressed and linear-oblanceolate to oblong-oblique, glabrous or hairy; pappi 0, or coroniform, or of 2–8+ scales or teeth. |
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Discs | 15–35 × 14–22 mm. |
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2n | = 36. |
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Rudbeckia glaucescens |
Asteraceae tribe Heliantheae subtribe Rudbeckiinae |
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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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North America; Mexico |
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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.) |
Genera 2, species 30 (2 genera, 27 species in the flora). The genera of Rudbeckiinae have traditionally been included in Verbesininae (e.g., G. Bentham 1873) or in Helianthinae (e.g., T. F. Stuessy 1977[1978]). Sometimes, Rudbeckiinae has included Echinacea (e.g., P. O. Karis and O. Ryding 1994). Here, we follow H. Robinson (1981) in placing Echinacea in Ecliptinae. In keys and descriptions for Ratibida and Rudbeckia, “discs” refers to receptacles at late flowering with paleae and florets in place and included in assessing shapes and in measurements of lengths and diameters. (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. 42. | ||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Rudbeckiinae > Rudbeckia > sect. Macrocline | Asteraceae > tribe Heliantheae | ||||
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Subordinate taxa | ||||||
Synonyms | R. californica var. glauca | |||||
Name authority | Eastwood: Leafl. W. Bot. 2: 55. (1937) | H. Robinson: Phytologia 41: 43. (1978) | ||||
Web links |