Rudbeckia glaucescens

Eastwood

Leafl. W. Bot. 2: 55. 1937.

Common names: Waxy coneflower
Endemic
Synonyms: Rudbeckia californica var. glauca S. F. Blake
Treatment appears in FNA Volume 21. Treatment on page 48. Mentioned on page 47.

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. Heads borne singly or (2–10) in ± corymbiform arrays. Phyllaries to 1.5 cm. 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. Discs 15–35 × 14–22 mm. Disc florets 250–400+; corollas yellowish green, 3–4 mm; style branches ca. 1 mm, apices acute. Cypselae 4–5.5 mm; pappi coroniform or of ± connate scales, to 1.2 mm. 2n = 36.


Phenology: Flowering summer–fall.
Habitat: Meadows, seeps, streamsides
Elevation: 60–1300 m

Discussion

Rudbeckia glaucescens often grows on serpentine and often with Darlingtonia.

Selected References

None.

Lower Taxa

None.