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Chaenactis thompsonii

Thompson's pincushion

Habit Perennials, 10–30 cm (not or scarcely cespitose, not matted); proximal indument thinning with age, grayish, arachnoid-sericeous to thinly lanuginose.

mostly 5–15+, ascending to erect.


mostly cauline, 2–5 cm;

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

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


ascending to erect, 2–5 cm.


± obconic.


7–9 mm.


longest (10–)12–15 mm;

outer closely lanuginose, not stipitate-glandular, apices erect, ± rigid.


mostly 1–3 per stem.


7–9 mm (eglandular);

pappi: longest scales 3.5–5 mm.

Chaenactis thompsonii

Phenology Flowering Jun–Aug.
Habitat Rocky or gravelly serpentine slopes, scree, talus, openings in or above conifer forests
Elevation (900–)1200–2200 m ((3000–)3900–7200 ft)
from FNA
[WildflowerSearch map]
[BONAP county map]

Of conservation concern.

Chaenactis thompsonii appears to be sister to C. evermannii; it is known from the mountains of central and northwestern Washington. The similar habits of C. thompsonii and C. ramosa (= C. douglasii var. douglasii) appear to result from convergent evolution in the distinctive habitat of their type localities (Wenatchee Mountains), not from a close genetic relationship as suggested by Cronquist.

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

Source FNA vol. 21, p. 407.
Parent taxa 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. nevii, C. parishii, C. santolinoides, C. stevioides, C. suffrutescens, C. xantiana
Name authority Cronquist: in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. 5: 123, fig. [p. 125]. (1955)
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