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Common Yarrow

Achillea millefolium var. puberula (Rydb.) Nobs

Comprehensive Description

provided by North American Flora
Achillea puberula Rydberg, sp. nov
A stout perennial; stem about 5 dm. high, sulcate, puberulent; leaves linear or linearoblanceolate in outline, 5-10 cm. long, less than 1 cm. wide, bipinnatifid, puberulent, not villous, conspicuously punctate; rachis distinctly winged, about 1 mm. wide; primary divisions ovate, short, ascending, the ultimate ones oblanceolate or obovate, thickened towards the spinulosemucronate tips; heads numerous, in compound corymbiform panicles; involucre about 4 mm. high and 3 mm. broad, nearly glabrous, minutely puberulent; bracts about 20, the outer lanceolate or lance-ovate, less than half as long as the innermost; inner bracts elliptic, obtuse; ray-flowers about 5; ligules white, suborbicular, 2 mm. long; disk-flowers about 20; corollas yellowish-white, 2.5 mm. long, densely glandular-granuliferous; achenes 2 mm. long, with thick margins.
Type collected in Suisun Marsh, California, July 6, 1913, Alice Eastwood 3460 (herb. N. Y. Bot. Gard.).
Distribution: Central California.
bibliographic citation
Per Axel Rydberg. 1916. (CARDUALES); CARDUACEAE; TAGETEAE, ANTHEMIDEAE. North American flora. vol 34(3). New York Botanical Garden, New York, NY
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