Erigeron uniflorus var. eriocephalus

(J. Vahl) B. Boivin

Phytologia 23: 49. 1972.

Common names: Vergerette à capitules laineux
Basionym: Erigeron eriocephalus J. Vahl in G. C. Oeder et al., Fl. Dan. 13(39): 6, plate 2299. 1840
Synonyms: Erigeron unalaschkensis var. eriocephalus (J. Vahl) A. E. Porsild Erigeron uniflorus subsp. eriocephalus (J. Vahl) Cronquist
Treatment appears in FNA Volume 20. Treatment on page 326. Mentioned on page 258.

Perennials, 3–25 (–35) cm; rhizomatous, fibrous-rooted, caudices crownlike, sometimes branched. Stems ascending, sparsely to densely villous or tomentose, especially distally (hair cross-walls often purplish black), minutely glandular. Leaves basal (persistent) and cauline; basal oblanceolate to subspatulate, 20–60 (–100) × 3–6 (–10) mm, cauline gradually reduced distally or little reduced on proximal 1/2, rarely all bractlike, margins entire, faces sparsely villosulous to glabrate, sometimes sparsely minutely glandular. Heads 1. Involucres 8–10 (–11) × (10–) 15–20 (–30) mm. Phyllaries in 2 (–3) series (reddish purple), densely lanate (hairs tangled, soft), glandular apically. Ray-florets 100–200; corollas purplish to pink or white, 3–6 (–8) mm, laminae erect (filiform, 0.3–1 mm wide), not coiling or reflexing. Disc corollas 3.8–5 mm. Cypselae 1.8–2.2 mm, 2-nerved, faces finely strigoso-hirsute; pappi: outer of setae (inconspicuous), inner of 20–30 (accrescent, surpassing disc corollas and involucres in fruit) bristles. 2n = 18.


Phenology: Flowering (Jun–)Jul–Aug.
Habitat: River terraces, snow beds, rocky hills, fell fields, shaley or gravelly slopes, well drained sand or silt, streambeds, peat deposits, herbmats proximal to snowbanks, dryas tundra
Elevation: 400–2200 m

Distribution

V20-735-distribution-map.gif

Greenland, B.C., Nfld. and Labr. (Labr.), N.W.T., Nunavut, Que., Yukon, Alaska, n Europe, Asia (Russia), Asia (Siberia)

Discussion

Evidence is not at hand that might clarify the biological relationship of and appropriate taxonomic rank for var. eriocephalus. Variety uniflorus occurs in the mountains of Europe and Caucasus, mostly south of var. eriocephalus; apparently the two intergrade [see detailed comments by S. G. Aiken et al. (http://www.mun.ca/biology/delta/arctif)].

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 +
(J. Vahl) B. Boivin +
6 cm60 mm <br />0.06 m <br /> (10 cm100 mm <br />0.1 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
decurrent +
Erigeron eriocephalus +
linear;lanceolate oblanceolate or spatulate +
rugulose +  and muricate +
crownlike +
Vergerette à capitules laineux +
not 2-lipped +  and actinomorphic +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
purplish +  and pink or white +
0.3 cm3 mm <br />0.003 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 +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
fertile +  and bisexual +
Greenland +, B.C. +, Nfld. and Labr. (Labr.) +, N.W.T. +, Nunavut +, Que. +, Yukon +, Alaska +, n Europe +, Asia (Russia) +  and Asia (Siberia) +
400–2200 m +
strigoso-hirsute +, sparsely villosulous +  and glabrate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
River terraces, snow beds, rocky hills, fell fields, shaley or gravelly slopes, well drained sand or silt, streambeds, peat deposits, herbmats proximal to snowbanks, dryas tundra +
disciform +  and discoid +
in loose , corymbiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
1 cm10 mm <br />0.01 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
turbinate;hemispheric +
1.5 cm15 mm <br />0.015 m <br /> (2 cm20 mm <br />0.02 m <br />) +
reflexing +  and erect +
not coiling +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering (Jun–)Jul–Aug. +
3-nerved +  and 1-nerved +
narrowly elliptic +  and linear-lanceolate +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
branched +  and simple +
prostrate +  and decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Erigeron unalaschkensis var. eriocephalus +  and Erigeron uniflorus subsp. eriocephalus +
Erigeron uniflorus var. eriocephalus +
Erigeron uniflorus +
variety +
inflated +  and tubular +
fibrous-rooted +  and rhizomatous +
25 cm250 mm <br />0.25 m <br /> (35 cm350 mm <br />0.35 m <br />) +
3 cm30 mm <br />0.03 m <br /> (25 cm250 mm <br />0.25 m <br />) +
tree +, shrub +  and subshrub +