Erigeron cavernensis

S. L. Welsh & N. D. Atwood

Great Basin Naturalist 48: 495, fig. 1. 1988.

Common names: Lone fleabane
Treatment appears in FNA Volume 20. Treatment on page 306. Mentioned on page 273.

Perennials, 1–6 cm (cespitose); taprooted, caudex branches usually relatively slender, lignescent, sometimes relatively elongate. Stems erect, sparsely to densely villous to hirsuto-villous, densely minutely glandular. Leaves all or mostly basal (persistent; petioles densely spreading-ciliate, cilia relatively thin-based); blades spatulate to oblanceolate-spatulate, 5–20 (–28) × (1.5–) 2–6 mm (bases abruptly contracted to petioles), margins entire, faces densely hirsuto-canescent, densely minutely glandular. Heads 1. Involucres 3.5–4.5 × 5–8 (–10) mm. Phyllaries in 2 (–3) series (often purplish,) sparsely hirsuto-villous, densely villous basally, evenly, densely minutely glandular. Ray-florets (12–) 16–24; corollas white to pinkish or lavender, sometimes with faint pink or lavender abaxial midstripe, 4.5–6 mm, laminae weakly coiling. Disc corollas 1.9–2.1 mm. Cypselae 1–1.2 mm, 2-nerved, faces strigose; pappi: outer of setae, inner of (11–) 13–20 bristles.


Phenology: Flowering Jun–Jul.
Habitat: Limestone ridges, outcrops, and cliffs, often with bristlecone pine, limber pine, spruce
Elevation: 2100–3400 m

Discussion

Of conservation concern.

Erigeron cavernensis has been treated as a synonym of E. uncialis (A. Cronquist 1994; G. L. Nesom 1992b); E. uncialis var. conjugans, which closely approaches E. cavernensis in its geographic range, is markedly different from the latter and perhaps more similar to E. cronquistii. Erigeron uncialis var. uncialis and E. uncialis var. conjugans, though different in vestiture, have more features in common among themselves and contrast as a unit with E. cavernensis.

Selected References

None.

Lower Taxa

None.

... more about "Erigeron cavernensis"
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 +
S. L. Welsh & N. D. Atwood +
decurrent +
2 cm20 mm <br />0.02 m <br /> (2.8 cm28 mm <br />0.028 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
spatulate;oblanceolate-spatulate +
2mm;6mm +
rugulose +  and muricate +
Lone fleabane +
not 2-lipped +  and actinomorphic +
white +  and pinkish or lavender +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.19 cm1.9 mm <br />0.0019 m <br /> (0.21 cm2.1 mm <br />0.0021 m <br />) +
fertile +  and bisexual +
2100–3400 m +
strigose +  and hirsuto-canescent +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Limestone ridges, outcrops, and cliffs, often with bristlecone pine, limber pine, spruce +
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 />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
turbinate;hemispheric +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
petiolate +  and sessile +
erect;spreading +
deltate +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering Jun–Jul. +
3-nerved +  and 1-nerved +
narrowly elliptic +  and linear-lanceolate +
Great Basin Naturalist +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
hirsuto-villous +
branched +  and simple +
prostrate +  and decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron cavernensis +
Erigeron +
species +
inflated +  and tubular +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
tree +, shrub +  and subshrub +