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

pebble pincushion, straw-bed pincushion

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 (5–)10–30(–60) cm.
Stems

1–25+, erect to spreading.

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 (often withering) and, usually, cauline, 1–6(–10) cm;

largest blades ± 3-dimensional, not to somewhat succulent;

primary lobes mostly 2–7(–10) pairs, ultimate lobes ± crowded to remote, antrorse, linear, terete.

Peduncles

mostly ascending to erect, 1–10 cm.

2–6 cm.

Involucres

obconic to ± hemispheric.

obconic to ± cylindric or hemispheric, mostly 5–10 mm diam.

Receptacles

paleae (0–)3–10+ (persistent, ± phyllary-like, apices visible among mature floret buds).

Corollas

5–8 mm.

4–6 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 7–10 mm, ± granular-glandular and villous;

apices (all or inner) erect to incurved, usually reddish, acuminate, aristate, terete.

Heads

1–25+ per stem.

Cypselae

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

pappi: longest scales 3–6 mm.

± terete, 3–4.5 mm;

pappi usually of 4(–5) scales, longest 3–5 mm.

Chaenactis douglasii

Chaenactis carphoclinia

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
AZ; CA; NM; NV; UT; nw Mexico
[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.)

Varieties 2 (2 in the flora).

Though occasionally suspected (P. Stockwell 1940), there are no confirmed natural or artificial hybrids between Chaenactis carphoclinia and any other member of the genus. The presence of paleae on the receptacle of C. carphoclinia is unique in Chaenactis.

(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
1. Leaves basal and cauline, longest 1–6(–7) cm; petioles scarcely dilated proximally, ± herbaceous
var. carphoclinia
1. Leaves ± basal, longest 7–10 cm; petioles dilated proximally, ± indurate
var. peirsonii
Source FNA vol. 21, p. 405. FNA vol. 21, p. 402.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Chaenactis > sect. Macrocarphus Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Chaenactis > sect. Acarphaea
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. cusickii, C. douglasii, C. evermannii, C. fremontii, C. glabriuscula, C. macrantha, C. nevadensis, C. nevii, C. parishii, C. santolinoides, C. stevioides, C. suffrutescens, C. thompsonii, C. xantiana
Subordinate taxa
C. douglasii var. alpina, C. douglasii var. douglasii
C. carphoclinia var. carphoclinia, C. carphoclinia var. peirsonii
Synonyms Hymenopappus douglasii, Macrocarphus douglasii
Name authority (Hooker) Hooker & Arnott: Bot. Beechey Voy., 354. (1839) A. Gray: in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 94. (1859)
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