Rudbeckia glaucescens |
Rudbeckia amplexicaulis |
|
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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/ |
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 |
CA; OR
|
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 | ||
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) |
Web links |