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Erigeron rydbergii
Erigeron rydbergii
Cronquist
Family:
Asteraceae
Images
not available
Flora of North America
Resources
Guy L. Nesom in Flora of North America (vol. 20)
Perennials,
2.5-6 cm; taprooted, caudex branches relatively short, thick.
Stems
erect, finely hirsutulous to villosulous, eglandular.
Leaves
mostly basal (persistent); blades linear-oblanceolate to narrowly spatulate, 10-50 × 1-3 mm, cauline mostly on proximal
1
/ 2 of stems, reduced distally, margins entire (apices obtuse to rounded), abaxial faces glabrous, adaxial glabrous or sparsely villous, eglandular.
Heads
1.
Involucres
5-6 × 7-12 mm.
Phyllaries
in 2-3 series, densely and finely hirsuto-villous (hairs without colored cross walls), minutely and inconspicuously glandular.
Ray florets
15-35; corollas usually bluish to purplish, rarely white, 6-9 mm, laminae coiling.
Disc corollas
3.7-5 mm.
Cypselae
1.8-2 mm, 2-nerved, faces sparsely strigose;
pappi:
outer of setae, inner of 15-20 bristles. Flowering Jun-Aug. Open subalpine to alpine slopes; 2000-3200 m; Idaho, Mont., Wyo.
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