Flora of North America species comparison

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Chaenactis nevii

Chaenactis nevadensis
Chaenactis nevii

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

Nevada dustymaiden, Sierra chaenactis, Sierra pincushion
Habit Plants 10–30 cm; proximal indument greenish to grayish, stipitate-glandular and, sometimes, sparsely arachnoid or villous. Perennials, 2–10(–12) cm (cespitose or ± matted); proximal indument ± thinning with age, whitish, lanuginose.
Stems

mostly 1–3;

branches mainly distal.

mostly 10–20+, decumbent 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, 2.5–5 cm;

largest blades ovate to deltate, ± plane, (1–)2-pinnately lobed;

primary lobes mostly 2–4 pairs, ± congested, ultimate lobes ± plane.
Peduncles

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

mostly ascending to erect, (0.5–)3–11 cm.
Involucres

± hemispheric to campanulate.

obconic to ± cylindric.
Florets

corollas bright yellow, 4–6.5 mm;

peripheral corollas ± erect, actinomorphic, scarcely enlarged.

Corollas

5.5–8 mm.
Phyllaries

longest 6–9 mm;

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

longest 9–12(–14) mm;

outer stipitate-glandular, apices erect, ± rigid.
Heads

mostly 3–9 per stem.

1(–2) per stem.
Cypselae

3.5–6 mm (compressed);

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

5.5–7.5 mm;

pappi: longest scales 3–5 mm.
2n

= 12.

= 12.

Chaenactis nevii

Chaenactis nevadensis
Phenology Flowering late Apr–mid July. Flowering Jul–mid Sep.
Habitat Nearly barren, heavy clay soils from volcanic ash and tuff, sometimes disturbed or moist sites Loose sandy or gravelly, mainly volcanic soils or scree (rarely on serpentine), openings in or above subalpine conifer forests
Elevation 400–1000 m (1300–3300 ft) 1900–3200 m (6200–10500 ft)
Distribution
from FNA
OR
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; NV
[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 nevadensis is known mainly from the northern Sierra Nevada and southern Cascade Range (Shasta to Placer counties, California; Washoe County, Nevada). It was recently discovered disjunct on ultramafic rocks of Bully Choop Mountain west of Redding, California, where it approaches small forms of C. suffrutescens in habit (see discussion there). It is sometimes cultivated in rock-gardens and may be found beyond its native range. Chaenactis nevadensis and C. suffrutescens appear to be sister or ancestor-derivative species. I have seen no evidence to support reports that C. nevadensis intergrades with C. alpigena (P. Stockwell 1940, as C. nevadensis var. mainsiana), with C. douglasii var. alpina (M. Graf 1999), or with any other taxon.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 411. FNA vol. 21, p. 405.
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. evermannii, C. fremontii, C. glabriuscula, C. macrantha, C. nevii, C. parishii, C. santolinoides, C. stevioides, C. suffrutescens, C. thompsonii, C. xantiana
Synonyms Hymenopappus nevadensis
Name authority A. Gray: Proc. Amer Acad. Arts 19: 30. (1883) (Kellogg) A. Gray: in W. H. Brewer et al., Bot. Calif. 1: 391. (1876)
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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