Antennaria microphylla

Rydberg

Bull. Torrey Bot. Club 24: 303. 1897

Common names: Littleleaf pussytoes
Synonyms: Antennaria bracteosa RydbergAntennaria microphylla var. solstitialis LunellAntennaria nitida GreeneAntennaria rosea var. nitida (Greene) BreitungAntennaria solstitialis Lunell
Treatment appears in FNA Volume 19. Treatment on page 407. Mentioned on page 389, 390, 396, 406, 409, 4.
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Dioecious. Plants 9–30 cm (stems stipitate-glandular distally). Stolons 1–5 cm. Basal leaves 1-nerved, spatulate, 6–16 × 2–6 mm, tips mucronate, faces silvery gray-pubescent. Cauline leaves linear, 5–25 mm, not flagged (apices acute). Heads 6–13 in corymbiform arrays. Involucres: staminate 5–6.5 mm; pistillate 5.5–7 mm. Phyllaries distally bright white to light yellow. Corollas: staminate 2.5–3 mm; pistillate 3–4.3 mm. Cypselae 0.7–1.2 mm, glabrous or sparingly papillate; pappi: staminate 3–4 mm; pistillate 3–5 mm. 2n = 28.

Phenology: Flowering early–mid summer.
Habitat: Moist open areas, flood plains of streams, margins of alkaline depressions, lower montane to subalpine (subarctic)
Elevation: 0–3200 m

Distribution

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Alta., B.C., Man., N.W.T., Nunavut, Ont., Que., Sask., Yukon, Alaska, Ariz., Calif., Colo., Idaho, Minn., Mont., Nebr., Nev., N.Mex., N.Dak., Oreg., S.Dak., Utah, Wash., Wyo.

Discussion

Antennaria microphylla is a primary sexual progenitor of the A. rosea polyploid agamic complex (R. J. Bayer 1990b). A. Cronquist (1955) included A. rosea within his circumscription of A. microphylla. It is preferable to recognize sexual diploids as distinct from their morphologically discrete hybrid apomictic derivatives. Antennaria microphylla is always dioecious and has stems distally stipitate-glandular and white phyllaries; A. rosea is always gynoecious and has stems without glandular hairs and phyllaries only occasionally white.

Some authors (A. E. Porsild 1950; E. H. Moss 1959; Porsild and W. J. Cody 1980) have recognized A. nitida as distinct; comparisons of the nomenclatural types of the two show that they are conspecific. Antennaria microphylla has allelopathic properties (G. D. Manners and D. S. Galitz 1985).

References

None.

Lower Taxa

No lower taxa listed.