Erigeron sionis

Cronquist

Brittonia 6: 258. 1947.

Common names: Zion fleabane
IllustratedEndemicConservation concern
Treatment appears in FNA Volume 20. Treatment on page 343. Mentioned on page 262.

Perennials, 1.5–25 cm (becoming colonial); taprooted or fibrous-rooted, stoloniform branches persistent (1–3.5 cm), lignescent, bearing leaf tufts at tips, usually not retaining old leaf-bases. Stems erect to ascending or decumbent, glabrous proximally, strigose on distal 1/2, minutely glandular near heads. Leaves basal (persistent) and cauline; basal blades oblanceolate to oblanceolate-spatulate, 50–760 × 1–11 mm, margins usually pinnately 3–5-lobed (sinuses reaching nearly to midveins), sometimes entire to dentate and mixed with lobed, faces glabrous or sparsely strigose, eglandular; cauline blades linear, gradually reduced distally, margins entire. Heads 1–4. Involucres 2–4.5 × 3.5–7 mm. Phyllaries in 3–5 series, moderately hirsute to hirtellous, minutely glandular. Ray-florets 22–38 (–46); corollas white, drying pink to lavender or blue, often with abaxial lilac midstripe, 4–7 mm, laminae not coiling or reflexing. Disc corollas 1.6–2.8 mm (throats slightly indurate and inflated). Cypselae 1–1.5 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 7–15 (–19) (persistent) bristles.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Basal leaves usually with linear-oblanceolate lobes, less commonly entire to dentate, blades and/or lobes 1–3(–4) mm wide; ray corollas drying white to pink or light lavender; sandstone Erigeron sionis var. sionis
1 Basal leaves entire or dentate, rarely deeply lobed, blades (2–)3–5(–11) mm wide; ray corollas drying pink to dark blue; limestone Erigeron sionis var. trilobatus
... more about "Erigeron sionis"
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 +
Cronquist +
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 +
linear;lanceolate oblanceolate or spatulate +
rugulose +  and muricate +
persistent +
stoloniform +
lignescent +
Zion fleabane +
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 +
strigose +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
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 +
entire +  and dentate +
3-5-lobed +
Not (?) +  and Scarious (?) +
2-carpellate +
3-nerved +  and 1-nerved +
moderately hirsute +  and hirtellous +
narrowly elliptic +  and linear-lanceolate +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
Illustrated +, Endemic +  and Conservation concern +
branched +  and simple +
prostrate +  and decumbent +
erect +  and ascending or decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron sionis +
Erigeron +
species +
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 +