Erigeron basalticus

Hoover

Leafl. W. Bot. 4: 40. 1944.

Common names: Basalt fleabane
EndemicConservation concern
Treatment appears in FNA Volume 20. Treatment on page 302. Mentioned on page 264.

Perennials, 7–25 cm; taprooted, caudices branched. Stems sprawling or pendent (branched), hirsute, minutely glandular. Leaves cauline; blades cuneate to obovate, 150–400 × 10–20 mm, nearly even-sized to near heads, margins 3-lobed or dentate (lobes sometimes with shallow secondary lobes or teeth, much narrower than central portion of blades, usually acute), faces hirsute, minutely glandular. Heads 1–4 (from medial or distal branches). Involucres 5–6 × 8–12 mm. Phyllaries in 2–3 series, usually densely villoso-hirsute, densely minutely glandular. Ray-florets 22–30; corollas white, drying pink to pinkish purple, 5–7 mm, laminae not coiling or reflexing. Disc corollas 3–4 mm. Cypselae ca. 1.5 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 10–15 bristles.


Phenology: Flowering May–Jun(–Oct).
Habitat: Dry, vertical, basalt cliffs of Yakima River and tributaries
Elevation: 300–500 m

Discussion

Of conservation concern.

Erigeron basalticus is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References

None.

Lower Taxa

None.
... more about "Erigeron basalticus"
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 +
Hoover +
decurrent +
15 cm150 mm <br />0.15 m <br /> (40 cm400 mm <br />0.4 m <br />) +
cuneate;obovate +
equal-sized +
10mm;20mm +
rugulose +  and muricate +
Basalt fleabane +
not 2-lipped +  and actinomorphic +
pink +  and pinkish purple +
0.5 cm5 mm <br />0.005 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 +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
fertile +  and bisexual +
300–500 m +
strigose +  and hirsute +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Dry, vertical, basalt cliffs of Yakima River and tributaries +
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 />) +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
turbinate;hemispheric +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
not coiling +
petiolate +  and sessile +
erect;spreading +
deltate +
more or less dentate to pinnatifid +  and entire +
dentate +  and 3-lobed +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering May–Jun(–Oct). +
3-nerved +  and 1-nerved +
villoso-hirsute +
narrowly elliptic +  and linear-lanceolate +
Leafl. W. Bot. +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Endemic +  and Conservation concern +
branched +  and simple +
prostrate +  and decumbent +
pendent +  and sprawling +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron basalticus +
Erigeron +
species +
inflated +  and tubular +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
7 cm70 mm <br />0.07 m <br /> (25 cm250 mm <br />0.25 m <br />) +
tree +, shrub +  and subshrub +