Chaenactis douglasii |
Chaenactis alpina |
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Douglas' dusty maidens, hoary false yarrow |
alpine chaenactis, alpine dusty maidens |
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Habit | Plants biennial or perennial, 5–60 cm. | Plants perennial, 2–10+ cm. |
Stems | erect, floccose-tomentose, often glandular-puberulent distally. |
erect, glandular-puberulent, usually proximally floccose or glabrate. |
Leaves | basal and cauline, narrowly lanceolate to oblanceolate, elliptic, or linear, 1–12 cm, 2-pinnately lobed; secondary lobes becoming inrolled and disc-like with age; surfaces tomentose, petiolate. |
basal, narrowly lanceolate to oblanceolate, elliptic, or linear, 1–6 cm, 2-pinnately lobed; secondary lobes becoming inrolled and disc-like with age; surfaces floccose-puberulent, petiolate. |
Involucres | obconic or campanulate, 8–15 mm. |
campanulate, 9–14 mm. |
Disc florets | corollas 5–8 mm, white, pink, or pale yellow, glabrous or glandular-puberulent; outer radially symmetric. |
corollas 5–8 mm, white, cream, or pinkish; surfaces glabrous; outer radially symmetric. |
Phyllaries | in 2–5 unequal series, linear to narrowly elliptic or oblanceolate; surfaces cobwebby to woolly, stipitate-glandular. |
in 3–4 subequal series, linear or narrowly oblanceolate; surfaces glandular-puberulent, sometimes hispid-ciliate. |
Fruits | 5–8 mm; surfaces strigose or glandular-puberulent; pappi in 3–4 series of unequal scales. |
5–8 mm, strigose-puberulent; pappi in 3–4 equal series of scales. |
Heads | erect, peduncled. |
erect, peduncled. |
2n | =12, 24, 36. |
=12. |
Chaenactis douglasii |
Chaenactis alpina |
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Distribution | ||
Discussion | Woodlands, shrublands, grasslands, dry hillsides, ridge tops, riverbanks, rock outcrops, disturbed areas. Flowering Apr–Sep. 0–2300 m. BR, BW, Casc, Col, ECas, Lava, Owy, Sisk. CA, ID, NV, WA; north to British Columbia, northeast to Alberta, east to SD, southeast to NM. Native. Chromosome studies by Mooring (1980) show that this species varies from diploid to hexaploid, with intermediate numbers resulting from hybridization. As a result, morphological differences at the diploid level become mixed into a morphological continuum among the polyploids. |
Alpine slopes and ridges. Flowering Jul–Sep. 2100–3100 m. BW. CA, ID; northeast to MT, east to WY, southeast to CO. Native. Some authorities treat C. alpina as a variety of C. douglasii. |
Source | Flora of Oregon, volume 2, page 219 Kenton Chambers |
Flora of Oregon, volume 2, page 218 Kenton Chambers |
Sibling taxa | ||
Synonyms | Chaenactis douglasii var. douglasii, Chaenactis douglasii var. glandulosa, Chaenactis douglasii var. montana, Chaenactis rubricaulis | Chaenactis douglasii var. alpina |
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