Flora of North America species comparison

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Chaenactis nevii

Chaenactis evermannii
Chaenactis nevii

John Day pincushion, John Day's pincushion, Nevius' chaenactis

Evermann's pincushion
Habit Plants 10–30 cm; proximal indument greenish to grayish, stipitate-glandular and, sometimes, sparsely arachnoid or villous. Perennials, mostly 6–12 cm (cespitose or ± matted); proximal indument thinning with age, grayish, mostly arachnoid-sericeous to thinly lanuginose.
Stems

mostly 1–3;

branches mainly distal.

mostly 5–20+, ascending to erect.
Leaves

basal (withering) and cauline, 2–5 cm;

largest blades ± elliptic, ± plane to 3-dimensional, not succulent, 1–2-pinnately lobed;

primary lobes mostly 3–8 pairs, ± remote, ultimate lobes ± plane to involute.

basal, 1–5 cm;

largest blades broadly ± elliptic, ± plane, 1-pinnately lobed;

lobes 2–5 pairs, remote, ± plane.
Peduncles

1–6 cm, distally stipitate-glandular and, sometimes, ± arachnoid to villous.

mostly ascending to erect, 5–10 cm.
Involucres

± hemispheric to campanulate.

± obconic.
Florets

corollas bright yellow, 4–6.5 mm;

peripheral corollas ± erect, actinomorphic, scarcely enlarged.

Corollas

5–6.5 mm.
Phyllaries

longest 6–9 mm;

outer predominantly stipitate-glandular and, sometimes, ± arachnoid to villous in fruit, apices ± erect, acute, rigid.

longest 8–12 mm;

outer predominantly closely lanuginose, sparsely, if at all, stipitate-glandular, apices erect, ± rigid.
Heads

mostly 3–9 per stem.

1(–3) per stem.
Cypselae

3.5–6 mm (compressed);

pappi 0 or coroniform (of ± 10 scales, longest 0.1–0.5 mm).

5–6.5 mm (eglandular);

pappi: longest scales 2.5–4.5 mm (lengths 0.4–0.8 times corollas).
2n

= 12.

= 12.

Chaenactis nevii

Chaenactis evermannii
Phenology Flowering late Apr–mid July. Flowering Jun–Aug.
Habitat Nearly barren, heavy clay soils from volcanic ash and tuff, sometimes disturbed or moist sites Subalpine, usually decomposing granitic sand or gravel slopes, ridges, scree, talus, openings in or above conifer forests
Elevation 400–1000 m (1300–3300 ft) 1200–3000 m (3900–9800 ft)
Distribution
from FNA
OR
[WildflowerSearch map]
[BONAP county map]
from FNA
ID
[BONAP county map]
Discussion

Chaenactis nevii is known from the John Day Basin area in Gilliam, Grant, Jefferson, Wasco, and Wheeler counties. This odd and isolated species combines traits of C. artemisiifolia (sect. Acarphaea) and C. glabriuscula, and might be descended from their common ancestor.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 411. FNA vol. 21, p. 408.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Chaenactis > sect. Chaenactis Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Chaenactis > sect. Macrocarphus
Sibling taxa
C. alpigena, C. artemisiifolia, C. carphoclinia, C. cusickii, C. douglasii, C. evermannii, C. fremontii, C. glabriuscula, C. macrantha, C. nevadensis, C. parishii, C. santolinoides, C. stevioides, C. suffrutescens, C. thompsonii, C. xantiana
C. alpigena, C. artemisiifolia, C. carphoclinia, C. cusickii, C. douglasii, C. fremontii, C. glabriuscula, C. macrantha, C. nevadensis, C. nevii, C. parishii, C. santolinoides, C. stevioides, C. suffrutescens, C. thompsonii, C. xantiana
Synonyms C. nevadensis var. mainsiana
Name authority A. Gray: Proc. Amer Acad. Arts 19: 30. (1883) Greene: Leafl. Bot. Observ. Crit. 2: 224. (1912)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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