Erigeron tenuis

Torrey & A. Gray

Fl. N. Amer. 2: 175. 1841.

Common names: Slender-leaf fleabane
IllustratedEndemic
Treatment appears in FNA Volume 20. Treatment on page 347. Mentioned on page 263, 320, 346.

Biennials or short-lived perennials, 10–45 cm; fibrous-rooted, caudices simple. Stems ascending (usually reddish proximally, branched distally), strigose, rarely hirsute proximally, eglandular. Leaves basal (commonly persistent) and cauline; basal blades oblanceolate to obovate or spatulate, 20–100 (–130) × 4–20 mm, margins serrate or crenate to pinnately lobed, faces sparsely hirsute to strigoso-hirsute (hairs ascending), eglandular; cauline becoming narrower and entire (bases not clasping or subclasping), abruptly reduced near midstem. Heads (1–) 3–20 (–60) in loosely corymbiform arrays (usually from branches beyond midstem). Involucres (2–) 2.5–4 × 5–10 mm. Phyllaries in 2–4 series, sparsely strigose, eglandular. Ray-florets 60–120; corollas blue to pale lavender or white, drying blue to purplish, 3–5 mm, laminae not coiling or reflexing. Disc corollas 2–2.7 mm. Cypselae 1–1.2 mm, 2 (–4) -nerved, faces sparsely strigose; pappi: outer of setae, inner of 11–15 bristles.


Phenology: Flowering mid Mar–May(–Jun, –Nov).
Habitat: Open oak, oak-pine, or pine woodlands, roadsides, fencerows, pastures, bottomland, sand or sandy clay, less common in clay
Elevation: 10–200 m

Distribution

V20-799-distribution-map.gif

Ala., Ark., Fla., Kans., La., Miss., Mo., Okla., Tex.

Discussion

A plant reported as Erigeron tenuis disjunct in North Carolina is perhaps better identified as E. strigosus: pappus bristles on the ray cypselae are reduced and variable in number.

Selected References

None.

Lower Taxa

None.
... more about "Erigeron tenuis"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Guy L. Nesom +
Torrey & A. Gray +
10 cm100 mm <br />0.1 m <br /> (13 cm130 mm <br />0.13 m <br />) +
2 cm20 mm <br />0.02 m <br /> (10 cm100 mm <br />0.1 m <br />) +
oblanceolate +  and obovate or spatulate +
0.4 cm4 mm <br />0.004 m <br /> (2 cm20 mm <br />0.02 m <br />) +
decurrent +
linear;lanceolate oblanceolate or spatulate +
rugulose +  and muricate +
Slender-leaf fleabane +
not 2-lipped +  and actinomorphic +
blue +  and pale lavender or white drying blue +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.2 cm2 mm <br />0.002 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
fertile +  and bisexual +
Ala. +, Ark. +, Fla. +, Kans. +, La. +, Miss. +, Mo. +, Okla. +  and Tex. +
10–200 m +
strigose +, sparsely hirsute +  and strigoso-hirsute +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open oak, oak-pine, or pine woodlands, roadsides, fencerows, pastures, bottomland, sand or sandy clay, less common in clay +
disciform +  and discoid +
in loose , corymbiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.25 cm2.5 mm <br />0.0025 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 /> (1 cm10 mm <br />0.01 m <br />) +
not coiling +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
more or less dentate to pinnatifid +  and entire +
crenate +  and pinnately lobed +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering mid Mar–May(–Jun, –Nov). +
narrowly elliptic +  and linear-lanceolate +
Fl. N. Amer. +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Illustrated +  and Endemic +
prostrate +  and decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron tenuis +
Erigeron +
species +
inflated +  and tubular +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
perennial +, short-lived +  and biennial +
10 cm100 mm <br />0.1 m <br /> (45 cm450 mm <br />0.45 m <br />) +
tree +, shrub +  and subshrub +