Chaenactis evermannii

Greene

Leafl. Bot. Observ. Crit. 2: 224. 1912.

Common names: Evermann’s pincushion
Endemic
Synonyms: Chaenactis nevadensis var. mainsiana (A. Nelson & J. F. Macbride) Stockwell
Treatment appears in FNA Volume 21. Treatment on page 408. Mentioned on page 404, 407.

Perennials, mostly 6–12 cm (cespitose or ± matted); proximal indument thinning with age, grayish, mostly arachnoid-sericeous to thinly lanuginose. Stems mostly 5–20+, ascending to erect. Leaves basal, 1–5 cm; largest blades broadly ± elliptic, ± plane, 1-pinnately lobed; lobes 2–5 pairs, remote, ± plane. Heads 1 (–3) per stem. Peduncles mostly ascending to erect, 5–10 cm. Involucres ± obconic. Phyllaries: longest 8–12 mm; outer predominantly closely lanuginose, sparsely, if at all, stipitate-glandular, apices erect, ± rigid. Corollas 5–6.5 mm. Cypselae 5–6.5 mm (eglandular); pappi: longest scales 2.5–4.5 mm (lengths 0.4–0.8 times corollas). 2n = 12.


Phenology: Flowering Jun–Aug.
Habitat: Subalpine, usually decomposing granitic sand or gravel slopes, ridges, scree, talus, openings in or above conifer forests
Elevation: 1200–3000 m

Discussion

Chaenactis evermannii is known from mountains of central Idaho. Reports of it from Washington and California/Nevada (P. Stockwell 1940, some as C. nevadensis var. mainsiana) were based on specimens of C. thompsonii and C. alpigena, respectively; all three species are closely related.

Selected References

None.

Lower Taxa

None.

"longest" is not a number.

... more about "Chaenactis evermannii"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +, cymiform +  and corymbiform +
indeterminate +  and determinate +
James D. Morefield +
Greene +
decurrent +
Undefined sect. Macrocarphus +
compound +  and simple +
lobed;ovate;oblanceolate;ovate;oblanceolate;linear;deltate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
connate +  and distinct +
Evermann’s pincushion +
actinomorphic +
white +  and pinkish or cream +
stipitate-glandular +  and hairy +
0.5 cm5 mm <br />0.005 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
1200–3000 m +
strigose +  and densely sericeous +
scabrellous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
campanulate +  and cylindric +
Subalpine, usually decomposing granitic sand or gravel slopes, ridges, scree, talus, openings in or above conifer forests +
in more or less cymiform arrays +, singly +  and radiant +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
lobed +  and plane +
1 cm10 mm <br />0.01 m <br /> (?) +  and 5 cm50 mm <br />0.05 m <br /> (?) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
dentate to pinnatifid or palmatifid +  and entire +
stipitate-glandular +  and lanuginose +
2-carpellate +
persistent +
coroniform +
5 cm50 mm <br />0.05 m <br /> (10 cm100 mm <br />0.1 m <br />) +
Flowering Jun–Aug. +
5 +  and 21 +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
mostly arachnoid-sericeous +  and thinly lanuginose +
Leafl. Bot. Observ. Crit. +
bearing subulate enations +, hairy +  and bristly +
knobby;convex;more or less flat +
distinct +
10 +  and 20 +
exalbuminous +
unequal +
ascending +  and erect +
5 +  and 20 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Chaenactis nevadensis var. mainsiana +
Chaenactis evermannii +
Chaenactis sect. Macrocarphus +
species +
cylindric +
80 cm800 mm <br />0.8 m <br /> (300 cm3,000 mm <br />3 m <br />) +
1 cm10 mm <br />0.01 m <br /> (80 cm800 mm <br />0.8 m <br />) +
toothed +  and entire +
70 cm700 mm <br />0.7 m <br /> (200 cm2,000 mm <br />2 m <br />) +
6 cm60 mm <br />0.06 m <br /> (12 cm120 mm <br />0.12 m <br />) +