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Erigeron sivinskii
Erigeron sivinskii
Nesom
Family:
Asteraceae
Images
not available
Flora of North America
Resources
Guy L. Nesom in Flora of North America (vol. 20)
Perennials,
5-8 cm; taprooted, caudex branches relatively short, thick, retaining old leaf bases.
Stems
erect (greenish), closely strigose (hairs white, equal), eglan-dular.
Leaves
basal (persistent, persistent portions relatively short and broad) and cauline (petioles erect, greenish, bases broadened or not, not thickened and whitish-indurate); blades linear, 12-30 × 0.5-0.8 mm, cauline unreduced for ±
1
/ 2 stems, margins entire, eciliate, faces sparsely strigose, eglandular.
Heads
1.
Involucres
5-6 × (8-)10-14 mm.
Phyllaries
in 2-3 series (greenish, relatively thinly herbaceous), sparsely hirsuto-pilose along midribs, minutely glandular.
Ray florets
21-33; corollas white, with abaxial lilac midstripe, 7-9 mm, laminae coiling.
Disc corollas
3-3.8 mm.
Cypselae
(narrowly oblong) 2.8-3.1 mm, 2(-3)-nerved, margins sparsely ciliate, faces glabrous;
pappi:
outer of setae, inner of 21-27 bristles. Flowering May-Jun. Red clay slopes of Summerville Formation and eroded, shale slopes of the Chinle Formation, desert scrub and pinyon-juniper woodland; of conservation concern; 1700-2300 m; Ariz., N.Mex.
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