Erigeron melanocephalus

(A. Nelson) A. Nelson

Bull. Torrey Bot. Club 26: 246. 1899.

Common names: Black-head fleabane
Endemic
Basionym: Erigeron uniflorus var. melanocephalus A. Nelson Wyoming Agric. Exp. Sta. Bull. 28: 131. 1896
Treatment appears in FNA Volume 20. Treatment on page 323. Mentioned on page 266.

Perennials, 3–12 (–21 at lower elevations) cm; fibrous-rooted, rhizomatous, caudices decumbent, often branched, rhizomelike, sometimes taprootlike. Stems erect, distally villous (hairs with black cross-walls), minutely glandular near heads. Leaves mostly basal (persistent), some cauline; blades spatulate to oblanceolate, (10–) 20–50 (–150) × 4–6 (–15) mm, cauline linear, bractlike, margins entire (apices rounded to retuse), faces glabrous or sparsely hirsute, eglandular. Heads 1. Involucres 6–9 × 10–14 mm. Phyllaries in 2 (–3) series, sparsely villoso-sericeous (hairs flattened, cross-walls black, imparting distinct black color to involucres), glandular. Ray-florets 45–74; corollas white to purple, 7–11 mm (mostly 1–2 mm wide), laminae spreading, tardily coiling. Disc corollas 2.4–3.2 mm. Cypselae (oblanceoloid-oblong) 2–2.3 mm, 2-nerved, faces strigoso-hirsute; pappi: outer of setae, inner of 15–30 bristles. 2n = 18.


Phenology: Flowering Jul–Aug.
Habitat: Rocky slopes, talus, alpine and subalpine meadows, subalpine spruce-fir
Elevation: 3100–4000 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Erigeron melanocephalus"
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 +
(A. Nelson) A. Nelson +
decurrent +
Erigeron uniflorus var. melanocephalus +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
spatulate;oblanceolate +
4mm;6mm +
rugulose +  and muricate +
taprootlike +, rhizomelike +  and branched +
Black-head fleabane +
not 2-lipped +  and actinomorphic +
white +  and purple +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.32 cm3.2 mm <br />0.0032 m <br />) +
fertile +  and bisexual +
Colo. +, N.Mex. +, Utah +  and Wyo. +
3100–4000 m +
strigoso-hirsute +, hirsute +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rocky slopes, talus, alpine and subalpine meadows, subalpine spruce-fir +
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 />) +
0.6 cm6 mm <br />0.006 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
turbinate;hemispheric +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
petiolate +  and sessile +
erect;spreading +
deltate +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering Jul–Aug. +
3-nerved +  and 1-nerved +
villoso-sericeous +
narrowly elliptic +  and linear-lanceolate +
Bull. Torrey Bot. Club +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
branched +  and simple +
prostrate +  and decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron melanocephalus +
Erigeron +
species +
inflated +  and tubular +
rhizomatous +  and fibrous-rooted +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
3 cm30 mm <br />0.03 m <br /> (12 cm120 mm <br />0.12 m <br />) +
tree +, shrub +  and subshrub +