Erigeron versicolor

(Greenman) G. L. Nesom

Sida 9: 225. 1982.

Common names: Bald-fruit fleabane
Basionym: Achaetogeron versicolor Greenman Proc. Amer. Acad. Arts 41: 255. 1905
Synonyms: Achaetogeron chihuahuensis Larsen Erigeron geiseri var. calcicola Shinners Erigeron gilensis Wooton & Standley Erigeron mimegletes Shinners
Treatment appears in FNA Volume 20. Treatment on page 344. Mentioned on page 262.

Annuals or rarely short-lived perennials, 12–50(–80) cm; taprooted or rarely fibrous-rooted. Stems (single or multiple from bases) usually basally ascending, strigose to villous, often slightly and minutely stipitate-glandular near to heads. Leaves basal (usually not persistent) and cauline; blades narrowly lanceolate to oblanceolate, basal (5–)20–50 × 3–9 mm, cauline gradually reduced distally, margins entire or proximal shallowly crenate to serrate with 1–3 pairs of teeth, faces sparsely strigose, eglandular. Heads (1–)5–ca. 100. Involucres 2.5–4 × (3–)5–9 mm. Phyllaries in 2–3 series (margins scarious at least in inner), sparsely hirsute, minutely glandular. Ray florets 60–110; corollas white, 2.5–5(–7) mm, laminae not reflexing or coiling. Disc corollas 1.2–2 mm (throats slightly indurate and inflated). Cypselae (0.5–)0.8–1.3 mm, 2-nerved, faces glabrous or sparsely strigose; pappi: outer of minute, blunt scales or fimbriate crowns (to 0.15 mm), inner 0. 2n = 18, 27, 36.


Phenology: Flowering Apr–Jun(–Oct).
Habitat: Scattered and local, open sites, usually in moist soil, edges of low or marshy areas, stream edges, ditches
Elevation: 100–400 m (2600–2900 m, Ariz.)

Distribution

V20-792-distribution-map.gif

Ariz., N.Mex., Tex., Mexico.

Discussion

In Arizona, Erigeron versicolor grows in meadows, along creeks, and in pine-aspen-spruce areas.

Erigeron versicolor is distinguished by its annual duration, nodding buds, conic receptacles, broad phyllaries, and pappi of only minute crowns. The species appears to be disjunctly divided among three regions in the United States and Mexico (D. C. D. De Jong and G. L. Nesom 1996), and habitats vary widely. This is an unusual distribution. There is much variation in duration, root type, orientation of stem pubescence, elaboration of the pappus crown, and achene vestiture, and this morphologic variation does not appear to be strongly correlated with geography.

Selected References

None.

Lower Taxa

None.
... more about "Erigeron versicolor"
Guy L. Nesom +
(Greenman) G. L. Nesom +
Achaetogeron versicolor +
Bald-fruit fleabane +
Ariz. +, N.Mex. +, Tex. +  and Mexico. +
100–400 m (2600–2900 m, Ariz.) +
Scattered and local, open sites, usually in moist soil, edges of low or marshy areas, stream edges, ditches +
Flowering Apr–Jun(–Oct). +
Achaetogeron chihuahuensis +, Erigeron geiseri var. calcicola +, Erigeron gilensis +  and Erigeron mimegletes +
Erigeron versicolor +
Erigeron +
species +