Erigeron sionis var. trilobatus

(Maguire ex Cronquist) S. L. Welsh

Rhodora 95: 398. 1993.

EndemicConservation concern
Basionym: Erigeron flagellaris var. trilobatus Maguire ex Cronquist Brittonia 6: 258. 1947
Synonyms: Erigeron proselyticus G. L. Nesom
Treatment appears in FNA Volume 20. Treatment on page 344. Mentioned on page 343.

Basal leaves: blades (2–) 3–5 (–11) mm wide, margins usually entire or dentate, rarely deeply lobed. Ray corollas drying pink to dark blue. 2n = 18.


Phenology: Flowering Jul–Sep.
Habitat: Limestone cliff bases and faces, crevices, ledges, shelves, soil accumulations, talus, limestone gravel, lakeshores, bristlecone pine, spruce-fir-aspen, aspen, limber pine, Engelmann spruce
Elevation: 2200–3100 m

Discussion

Of conservation concern.

The leaves of var. sionis tend to be narrower and more deeply lobed than those of var. trilobatus; morphologic intermediacy makes these plants hard to separate even at varietal rank. Differences in habitat and an essentially allopatric distribution, however, suggest that two evolutionary entities are present.

Selected References

None.

Lower Taxa

None.
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 +
(Maguire ex Cronquist) S. L. Welsh +
5 cm50 mm <br />0.05 m <br /> (76 cm760 mm <br />0.76 m <br />) +
oblanceolate +  and oblanceolate-spatulate +
0.1 cm1 mm <br />0.001 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
decurrent +
Erigeron flagellaris var. trilobatus +
linear;lanceolate oblanceolate or spatulate +
3mm;5mm +
rugulose +  and muricate +
persistent +
stoloniform +
lignescent +
not 2-lipped +  and actinomorphic +
pink +  and lavender or blue +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
fertile +  and bisexual +
2200–3100 m +
strigose +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Limestone cliff bases and faces, crevices, ledges, shelves, soil accumulations, talus, limestone gravel, lakeshores, bristlecone pine, spruce-fir-aspen, aspen, limber pine, Engelmann 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 />) +
0.2 cm2 mm <br />0.002 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
turbinate;hemispheric +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
not coiling +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
dentate +  and entire +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering Jul–Sep. +
3-nerved +  and 1-nerved +
moderately hirsute +  and hirtellous +
narrowly elliptic +  and linear-lanceolate +
pink +  and dark blue +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Endemic +  and Conservation concern +
branched +  and simple +
prostrate +  and decumbent +
erect +  and ascending or decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Erigeron proselyticus +
Erigeron sionis var. trilobatus +
Erigeron sionis +
variety +
inflated +  and tubular +
fibrous-rooted +  and taprooted +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (25 cm250 mm <br />0.25 m <br />) +
tree +, shrub +  and subshrub +