Erigeron speciosus

(Lindley) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle

in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 284. 1836.

Common names: Showy fleabane
Basionym: Stenactis speciosa Lindley Edwards’s Bot. Reg. 19: plate 1577. 1833
Synonyms: Erigeron conspicuus Rydberg Erigeron macranthus Nuttall Erigeron speciosus var. conspicuus (Rydberg) Breitung Erigeron speciosus var. macranthus (Nuttall) Cronquist Erigeron subtrinervis subsp. conspicuus (Rydberg) Cronquist Erigeron subtrinervis var. conspicuus (Rydberg) Cronquist
Treatment appears in FNA Volume 20. Treatment on page 330. Mentioned on page 268, 269, 331.

Perennials, 30–80 (–100) cm; rhizomatous, fibrous-rooted, caudices relatively thick. Stems erect, glabrous or sparsely hirsuto-pilose (hairs 0.5–1 mm), often minutely glandular distally. Leaves basal (usually withering by flowering) and cauline; basal blades oblanceolate-spatulate, 30–80 (–150) × 4–18 (–28) mm, margins entire, often ciliate (main veins sometimes also), faces glabrous, eglandular or distal sparsely minutely glandular; cauline blades ovate to ovatelanceolate, oblong-lanceolate, or lanceolate, nearly even-sized distally or sometimes mid largest (continuing to immediately below heads, bases usually clasping to subclasping). Heads (2–) 4–20 in corymbiform arrays. Involucres 6–9 × 11–22 mm. Phyllaries in 2–3 (–4) series, usually glabrous, sometimes sparsely hirsuto-pilose, minutely glandular. Ray-florets 75–150; corollas blue to lavender, rarely whitish, 8–16 mm (mostly 1 mm wide), laminae slightly coiling at least at tips. Disc corollas 4–5 mm. Cypselae 1.5–1.8 mm, 2 (–4) -nerved, faces sparsely strigose; pappi: outer of setae, inner of 20–30 bristles.


Phenology: Flowering Jul–Oct.
Habitat: Dry or moist, gravelly or loamy soil, prairies, yellow pine, pine-fir, spruce-fir, aspen-spruce
Elevation: (600–)900–3400 m

Distribution

V20-749-distribution-map.gif

Alta., B.C., Ariz., Colo., Idaho, Mont., Nev., N.Mex., Oreg., S.Dak., Utah, Wash., Wyo., Mexico (Baja California)

Discussion

The population in Baja California is disjunct from the closest range in Arizona and northern Nevada.

Plants glabrous and glandular on the phyllaries, stems, and leaves have been recognized as var. macranthus; they intergrade with hairier forms and do not show a coherent geographic pattern. Plants commonly identified as Erigeron subtrinervis var. conspicuus usually have stems sparsely hirsuto-pilose with hairs 1–1.5 mm, and the leaves commonly are ciliate on the margins and veins. As implied in the nomenclatural combination by Breitung, those plants are more similar to E. speciosus than to E. subtrinervis, and they apparently show part of the greater variability of E. speciosus in the northwestern part of its range (Alberta, British Columbia, Idaho, Montana, Oregon, Washington, and Wyoming), where more typical plants also occur. Erigeron speciosus and E. subtrinervis are sympatric over large parts of their ranges and appear to be at least partially reproductively isolated entities, although intermediates are frequently encountered.

Selected References

None.

Lower Taxa

None.

"thick" is not a number.

... more about "Erigeron speciosus"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Guy L. Nesom +
(Lindley) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle +
8 cm80 mm <br />0.08 m <br /> (15 cm150 mm <br />0.15 m <br />) +
1.8 cm18 mm <br />0.018 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
oblanceolate-spatulate +
0.4 cm4 mm <br />0.004 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
decurrent +
Stenactis speciosa +
linear;lanceolate oblanceolate or spatulate +
rugulose +  and muricate +
ovate +  and ovatelanceolate oblong-lanceolate or lanceolate +
largest +  and equal-sized +
Showy fleabane +
not 2-lipped +  and actinomorphic +
whitish +, blue +  and lavender +
0.8 cm8 mm <br />0.008 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
fertile +  and bisexual +
Alta. +, B.C. +, Ariz. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, S.Dak. +, Utah +, Wash. +, Wyo. +  and Mexico (Baja California) +
(600–)900–3400 m +
strigose +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Dry or moist, gravelly or loamy soil, prairies, yellow pine, pine-fir, spruce-fir, aspen-spruce +
disciform +  and discoid +
in loose , corymbiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
turbinate;hemispheric +
1.1 cm11 mm <br />0.011 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering Jul–Oct. +
3-nerved +  and 1-nerved +
hirsuto-pilose +  and glabrous +
narrowly elliptic +  and linear-lanceolate +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
branched +  and simple +
prostrate +  and decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Erigeron conspicuus +, Erigeron macranthus +, Erigeron speciosus var. conspicuus +, Erigeron speciosus var. macranthus +, Erigeron subtrinervis subsp. conspicuus +  and Erigeron subtrinervis var. conspicuus +
Erigeron speciosus +
Erigeron +
species +
inflated +  and tubular +
fibrous-rooted +  and rhizomatous +
80 cm800 mm <br />0.8 m <br /> (100 cm1,000 mm <br />1 m <br />) +
30 cm300 mm <br />0.3 m <br /> (80 cm800 mm <br />0.8 m <br />) +
tree +, shrub +  and subshrub +