Erigeron sivinskii

G. L. Nesom

Phytologia 71: 416. 1992.

Common names: Sivinski’s fleabane
Treatment appears in FNA Volume 20. Treatment on page 297. Mentioned on page 276.

Perennials, 5–8 cm; taprooted, caudex branches relatively short, thick, retaining old leaf-bases. Stems erect (greenish), closely strigose (hairs white, equal), eglandular. Leaves basal (persistent, persistent portions relatively short and broad) and cauline (petioles erect, greenish, bases broadened or not, not thickened and whitish-indurate); blades linear, 12–30 × 0.5–0.8 mm, cauline unreduced for ± 1/2 stems, margins entire, eciliate, faces sparsely strigose, eglandular. Heads 1. Involucres 5–6 × (8–) 10–14 mm. Phyllaries in 2–3 series (greenish, relatively thinly herbaceous), sparsely hirsuto-pilose along midribs, minutely glandular. Ray-florets 21–33; corollas white, with abaxial lilac midstripe, 7–9 mm, laminae coiling. Disc corollas 3–3.8 mm. Cypselae (narrowly oblong) 2.8–3.1 mm, 2 (–3) –nerved, margins sparsely ciliate, faces glabrous; pappi: outer of setae, inner of 21–27 bristles.


Phenology: Flowering May–Jun.
Habitat: Red clay slopes of Summerville Formation and eroded, shale slopes of the Chinle Formation, desert scrub and pinyon-juniper woodland
Elevation: 1700–2300 m

Discussion

Of conservation concern.

Selected References

None.

Lower Taxa

None.
... more about "Erigeron sivinskii"
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 +
G. L. Nesom +
decurrent +
1.2 cm12 mm <br />0.012 m <br /> (3 cm30 mm <br />0.03 m <br />) +
linear;lanceolate oblanceolate or spatulate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.08 cm0.8 mm <br />8.0e-4 m <br />) +
rugulose +  and muricate +
Sivinski’s fleabane +
not 2-lipped +  and actinomorphic +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.3 cm3 mm <br />0.003 m <br /> (0.38 cm3.8 mm <br />0.0038 m <br />) +
fertile +  and bisexual +
Ariz. +  and N.Mex. +
1700–2300 m +
glabrous +  and strigose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Red clay slopes of Summerville Formation and eroded, shale slopes of the Chinle Formation, desert scrub and pinyon-juniper woodland +
disciform +  and discoid +
in loose , corymbiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
turbinate;hemispheric +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
not +  and scarious +
2-carpellate +
Flowering May–Jun. +
3-nerved +  and 1-nerved +
hirsuto-pilose +
narrowly elliptic +  and linear-lanceolate +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
prostrate +  and decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron sivinskii +
Erigeron +
species +
inflated +  and tubular +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
5 cm50 mm <br />0.05 m <br /> (8 cm80 mm <br />0.08 m <br />) +
tree +, shrub +  and subshrub +