Rudbeckia glaucescens |
Rudbeckia nitida |
|
---|---|---|
California coneflower, waxy cone-flower |
shiny coneflower, St. John's or black-eyed susan |
|
Habit | Perennials, to 150 cm (roots fibrous). | Perennials, to 140 cm (rhizomatous, 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. |
green (lightly glaucous), blades elliptic to lanceolate (not lobed), leathery, bases attenuate to cuneate, margins crenate, entire, or toothed, apices acute, faces glabrous or sparsely hairy; basal petiolate, 15–60 × 2–8 cm; cauline petiolate or sessile, 5–50 × 2–9 cm. |
Receptacles | conic to columnar; paleae 4–6.5 mm, apices acute, often attenuate, abaxial tips hairy. |
ovate to columnar; paleae (recurved prior to flowering, erect to spreading in young heads) 5–6 mm, apices acute to acuminate, abaxial tips hairy. |
Ray florets | 7–15; laminae elliptic to oblong, 25–40 × 8–14 mm, abaxially hairy. |
8–15; laminae oblong to oblanceolate, 12–60 × 5–15 mm, abaxially sparsely hairy. |
Disc florets | 250–400+; corollas yellowish green, 3–4 mm; style branches ca. 1 mm, apices acute. |
200–300+; corollas yellowish green proximally, maroon distally, 3.5–4.5 mm; style branches ca. 1.2 mm, apices acute to acuminate. |
Phyllaries | to 1.5 cm. |
to 2 cm (margins sometimes ciliate, sparsely hairy). |
Heads | borne singly or (2–10) in ± corymbiform arrays. |
borne singly or in ± corymbiform arrays. |
Cypselae | 4–5.5 mm; pappi coroniform or of ± connate scales, to 1.2 mm. |
3–5.5 mm; pappi ± coroniform, to 2 mm. |
Discs | 15–35 × 14–22 mm. |
10–30 × 12–20 mm. |
2n | = 36. |
= 36. |
Rudbeckia glaucescens |
Rudbeckia nitida |
|
Phenology | Flowering summer–fall. | Flowering spring–summer. |
Habitat | Meadows, seeps, streamsides | Wet pinelands, swales, ditches, bayous |
Elevation | 60–1300 m (200–4300 ft) | 0–40 m (0–100 ft) |
Distribution |
CA; OR
|
FL; GA |
Discussion | Rudbeckia glaucescens often grows on serpentine and often with Darlingtonia. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Rudbeckia nitida grows in northern Florida and southern Georgia (a report for Alabama has not been confirmed). It is cultivated as an ornamental. According to R. Kral (1983), it is threatened or endangered and is associated with savanna or bog dicots and monocots, particularly Eriocaulon, Sarracenia, Lachnocaulon, Rhexia, Xyris, and the composites Coreopsis, Helianthus, and Liatris. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 48. | FNA vol. 21, p. 51. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Rudbeckiinae > Rudbeckia > sect. Macrocline | Asteraceae > tribe Heliantheae > subtribe Rudbeckiinae > Rudbeckia > sect. Macrocline |
Sibling taxa | ||
Synonyms | R. californica var. glauca | R. glabra |
Name authority | Eastwood: Leafl. W. Bot. 2: 55. (1937) | Nuttall: J. Acad. Nat. Sci. Philadelphia 7: 78. (1834) |
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