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"
36 +, 27 +  and 18 +
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +, corymbiform +  and loose +
indeterminate +  and determinate +
Guy L. Nesom +
(Greenman) G. L. Nesom +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
decurrent +
Achaetogeron versicolor +
narrowly lanceolate;oblanceolate +
rugulose +  and muricate +
Bald-fruit fleabane +
not 2-lipped +  and actinomorphic +
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
fimbriate +
beaked +, 2-ribbed +  and 5-ribbed +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
fertile +  and bisexual +
Ariz. +, N.Mex. +, Tex. +  and Mexico +
100–400 m (2600–2900 m, Ariz.) +
strigose +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Scattered and local, open sites, usually in moist soil, edges of low or marshy areas, stream edges, ditches +
disciform +  and discoid +
in loose , corymbiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
turbinate;hemispheric +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
not reflexing +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
more or less dentate to pinnatifid +  and entire +
shallowly crenate +  and serrate +
Not (?) +  and Scarious (?) +
stipitate-glandular +
2-carpellate +
Flowering Apr–Jun(–Oct). +
3-nerved +  and 1-nerved +
narrowly elliptic +  and linear-lanceolate +
shallowly crenate +  and serrate +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
branched +  and simple +
prostrate +  and decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron chihuahuensis +, Erigeron geiseri var. calcicola +, Erigeron gilensis +  and Erigeron mimegletes +
Erigeron versicolor +
Erigeron +
species +
inflated +  and tubular +
fibrous-rooted +  and taprooted +
50 cm500 mm <br />0.5 m <br /> (80 cm800 mm <br />0.8 m <br />) +
perennial +, short-lived +  and annual +
12 cm120 mm <br />0.12 m <br /> (50 cm500 mm <br />0.5 m <br />) +
tree +, shrub +  and subshrub +