Erigeron robustior

(Cronquist) G. L. Nesom

Sida 21: 21. 2004.

Common names: White cushion fleabane
Endemic
Basionym: Erigeron decumbens subsp. robustior Cronquist Brittonia 6: 174. 1947
Synonyms: Erigeron decumbens var. robustior (Cronquist) Cronquist
Treatment appears in FNA Volume 20. Treatment on page 279. Mentioned on page 274, 275.

Perennials, (15–) 25–55 cm (not colonial); taprooted, taproots thin (2–3 mm wide), caudices simple or with relatively slender and short, erect branches. Stems (often purplish) erect or decumbent, sparsely strigillose (basal-cells inclined, hairs even-width), eglandular. Leaves basal (often withering by flowering) and cauline; basal blades (3-nerved) linear to narrowly oblanceolate, 90–170 × 3–7 mm, cauline gradually reduced distally, ending proximal to heads, margins entire, faces strigoso-hirsute, eglandular. Heads 1–3. Involucres 6–8.5 × (12–) 14–20 mm. Phyllaries in 2–3 (–4) series (narrowly oblanceolate to lanceolate, acute-acuminate), sparsely to moderately hirsute to villous, eglandular. Ray-florets 21–36; corollas 7–15 (–19) mm, laminae white to pinkish, not coiling or reflexing. Disc corollas 3.5–4.5 mm. Cypselae (1.8–) 2–3.2 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 15–22 bristles.


Phenology: Flowering Jun–Jul.
Habitat: Rocky or gravelly slopes, sometimes over serpentine, glades and meadows, seeps, sagebrush-scrub, proximal montane coniferous forest
Elevation: (200–)700–1500 m

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Erigeron robustior"
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) G. L. Nesom +
9 cm90 mm <br />0.09 m <br /> (17 cm170 mm <br />0.17 m <br />) +
linear +  and narrowly oblanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
decurrent +
Erigeron decumbens subsp. robustior +
linear;lanceolate oblanceolate or spatulate +
rugulose +  and muricate +
slender +
with relatively slender and short , erect branches +  and simple +
White cushion fleabane +
not 2-lipped +  and actinomorphic +
1.5 cm15 mm <br />0.015 m <br /> (1.9 cm19 mm <br />0.019 m <br />) +
yellow +, usually white +  and bluish or purplish +
0.7 cm7 mm <br />0.007 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
fertile +  and bisexual +
(200–)700–1500 m +
strigose +  and strigoso-hirsute +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Rocky or gravelly slopes, sometimes over serpentine, glades and meadows, seeps, sagebrush-scrub, proximal montane coniferous forest +
disciform +  and discoid +
in loose , corymbiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
1.2 cm12 mm <br />0.012 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
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 /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
turbinate;hemispheric +
1.4 cm14 mm <br />0.014 m <br /> (2 cm20 mm <br />0.02 m <br />) +
white +  and pinkish +
not coiling +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering Jun–Jul. +
hirsute +  and villous +
narrowly elliptic +  and linear-lanceolate +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
prostrate +  and decumbent +
decumbent +  and erect +
appendaged +  and truncate +
papillate +  and smooth +
Erigeron decumbens var. robustior +
Erigeron robustior +
Erigeron +
species +
inflated +  and tubular +
15 cm150 mm <br />0.15 m <br /> (25 cm250 mm <br />0.25 m <br />) +
25 cm250 mm <br />0.25 m <br /> (55 cm550 mm <br />0.55 m <br />) +
tree +, shrub +  and subshrub +