Erigeron grandiflorus

Hooker

Fl. Bor.-Amer. 2: 18, plate 123. 1834.

Common names: Rocky Mountain alpine fleabane
IllustratedEndemic
Synonyms: Erigeron simplex Greene
Treatment appears in FNA Volume 20. Treatment on page 324. Mentioned on page 267, 325.

Perennials, 2–25 cm; rhizomatous, fibrous-rooted, caudices or rhizomes crownlike or branches relatively short and thick. Stems erect to decumbent-ascending, sparsely to moderately pilose to villoso-hirsute, often stipitate-glandular over all or part. Leaves basal (persistent) and cauline (petioles equaling or shorter than blades); blades oblanceolate to obovate or spatulate, 10–60 (–90) × 3–8 (–14) mm, cauline abruptly or gradually reduced distally, margins entire (apices rounded), faces sparsely hirsutulous or villous to sparsely strigose or glabrate, sometimes sparsely glandular. Heads 1. Involucres 5–8 (–10) × 8–20 mm. Phyllaries in 2–3 series (green or purplish), moderately to densely woolly-villous (hairs flattened, cross-walls sometimes reddish), minutely glandular at least apically. Ray-florets 50–130; corollas blue to pink or purplish, rarely white, 7–11 (–15) mm (mostly 1–2 mm wide), laminae coiling. Disc corollas 2.4–4 (–5) mm. Cypselae 1.8–2.4 mm, 2-nerved, faces strigose; pappi: outer of setae, inner of (7–) 10–18 (–22) bristles. 2n = 18, 27.


Phenology: Flowering Jul–Aug(–Sep).
Habitat: Rocky sites, meadows, alpine or near timberline
Elevation: 2900–4200 m

Distribution

V20-729-distribution-map.gif

Alta., B.C., Ariz., Colo., Idaho, Mont., N.Mex., Oreg., Utah, Wyo.

Discussion

S. A. Spongberg (1971) recognized only the triploid populations as Erigeron grandiflorus and assigned the diploid ones to E. simplex. He hypothesized that the triploids incorporate genomic elements from an ancestor other than E. simplex. Based on his comments and annotations, however, triploids in southern Canada and the western United States apparently differ from the much more widespread diploids only quantitatively, having involucres and florets at the higher end of size ranges. Morphologic distinctions between the ploidal races do not provide a basis for consistent distinction. Spongberg (p. 200) also noted that “because of the intergrading of morphologic features of plants of Erigeron grandiflorus...the single most important criterion indicative of this taxon is highly irregular [in shape] and greatly abortive pollen.” These pollen features result from meiotic anomalies associated with the triploid condition.

Specimen citations by A. Cronquist (1947) for Erigeron grandiflorus were mostly from collections of the species treated here as E. porsildii. He also cited two collections from southwestern Alberta; those and the type collection of E. grandiflorus (from the same region) are disjunct by more than 1500 kilometers from the more northern range of E. porsildii and instead lie at the northern extremity of the range of what previously has generally been identified as E. simplex.

Selected References

None.

Lower Taxa

None.
... more about "Erigeron grandiflorus"
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 +
Hooker +
decurrent +
6 cm60 mm <br />0.06 m <br /> (9 cm90 mm <br />0.09 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
oblanceolate;obovate or spatulate +
3mm;8mm +
rugulose +  and muricate +
fibrous-rooted +
crownlike +
Rocky Mountain alpine fleabane +
not 2-lipped +  and actinomorphic +
1.1 cm11 mm <br />0.011 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
white +, blue +  and pink or purplish +
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 +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
0.24 cm2.4 mm <br />0.0024 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
fertile +  and bisexual +
Alta. +, B.C. +, Ariz. +, Colo. +, Idaho +, Mont. +, N.Mex. +, Oreg. +, Utah +  and Wyo. +
2900–4200 m +
strigose +, villous +  and sparsely strigose or glabrate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rocky sites, meadows, alpine or near timberline +
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 />) +
0.5 cm5 mm <br />0.005 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
turbinate;hemispheric +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering Jul–Aug(–Sep). +
3-nerved +  and 1-nerved +
woolly-villous +
narrowly elliptic +  and linear-lanceolate +
Fl. Bor.-Amer. +
bearing subulate enations +, hairy +  and bristly +
fibrous-rooted +
crownlike +
exalbuminous +
Illustrated +  and Endemic +
branched +  and simple +
prostrate +  and decumbent +
erect +  and decumbent-ascending +
appendaged +  and truncate +
papillate +  and smooth +
Erigeron simplex +
Erigeron grandiflorus +
Erigeron +
species +
inflated +  and tubular +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
2 cm20 mm <br />0.02 m <br /> (25 cm250 mm <br />0.25 m <br />) +
tree +, shrub +  and subshrub +