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chaenactis, Douglas' dusty maidens, Douglas' dustymaiden, hoary chaenactis, hoary false-yarrow, hoary pincushion

Chaenactis nevii

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

Habit Biennials or perennials, (2–)5–50(–60) cm (rarely slightly woody or flowering first year, sometimes cespitose or ± matted); proximal indument thinning with age, grayish, mostly arachnoid-sericeous to thinly lanuginose. Plants 10–30 cm; proximal indument greenish to grayish, stipitate-glandular and, sometimes, sparsely arachnoid or villous.
Stems

1–25+, erect to spreading.

mostly 1–3;

branches mainly distal.

Leaves

basal, or basal (sometimes withering) and ± cauline, (1–)2–12(–15) cm;

largest blades ± elliptic or slightly lanceolate to ovate, ± 3-dimensional, usually 2-pinnately lobed;

primary lobes (4–)5–9(–12) pairs, ± congested, scarcely imbricate, ultimate lobes ± involute and/or twisted.

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.

Peduncles

mostly ascending to erect, 1–10 cm.

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

Involucres

obconic to ± hemispheric.

± hemispheric to campanulate.

Florets

corollas bright yellow, 4–6.5 mm;

peripheral corollas ± erect, actinomorphic, scarcely enlarged.

Corollas

5–8 mm.

Phyllaries

longest 9–15(–17) mm;

outer usually stipitate-glandular (sometimes sparsely or obscurely, rarely eglandular) and, often, arachnoid to lanuginose and, sometimes, sparsely villous, apices usually ± squarrose, pliant.

longest 6–9 mm;

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

Heads

1–25+ per stem.

mostly 3–9 per stem.

Cypselae

5–8 mm (usually sparsely glandular amidst other indument);

pappi: longest scales 3–6 mm.

3.5–6 mm (compressed);

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

2n

= 12.

Chaenactis douglasii

Chaenactis nevii

Phenology Flowering late Apr–mid July.
Habitat Nearly barren, heavy clay soils from volcanic ash and tuff, sometimes disturbed or moist sites
Elevation 400–1000 m (1300–3300 ft)
Distribution
from FNA
AZ; CA; CO; ID; MT; ND; NM; NV; OR; SD; UT; WA; WY; AB; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

Chaenactis douglasii is widespread and variable (see discussion under var. douglasii).

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

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.)

Key
1. Leaves basal (sometimes withering) and ± cauline; plants not or scarcely cespitose, not matted; stems usually 1–5(–12); heads (1–)2–25+ per stem
var. douglasii
1. Leaves strictly basal; plants cespitose or ± matted; stems (1–)10–25+; heads 1(–2) per stem
var. alpina
Source FNA vol. 21, p. 405. FNA vol. 21, p. 411.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Chaenactis > sect. Macrocarphus Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Chaenactis > sect. Chaenactis
Sibling taxa
C. alpigena, C. artemisiifolia, C. carphoclinia, C. cusickii, C. evermannii, C. fremontii, C. glabriuscula, C. macrantha, C. nevadensis, C. nevii, 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. nevadensis, C. parishii, C. santolinoides, C. stevioides, C. suffrutescens, C. thompsonii, C. xantiana
Subordinate taxa
C. douglasii var. alpina, C. douglasii var. douglasii
Synonyms Hymenopappus douglasii, Macrocarphus douglasii
Name authority (Hooker) Hooker & Arnott: Bot. Beechey Voy., 354. (1839) A. Gray: Proc. Amer Acad. Arts 19: 30. (1883)
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