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FNA | Family List | FNA Vol. 19, 20 and 21 | Asteraceae | Antennaria

17c. Antennaria howellii Greene subsp. neodioica (Greene) R. J. Bayer, Brittonia. 41: 397. 1989.

Antennaire néodioïque

Antennaria neodioica Greene, Pittonia 3: 184. 1897; A. alsinoides Greene; A. grandis (Fernald) House; A. neglecta Greene var. attenuata (Fernald) Cronquist; A. neglecta var. neodioica (Greene) Cronquist; A. neodioica var. attenuata Fernald; A. neodioica var. chlorophylla Fernald; A. neodioica var. grandis Fernald; A. neodioica var. interjecta Fernald; A. neodioica var. rupicola (Fernald) Fernald; A. obovata E. E. Nelson; A. rupicola Fernald

Plants (6–)15–35 cm. Stolons 3–8(–12) cm (leaves along stolons almost equal to those of rosettes at ends). Basal leaves 1-nerved (sometimes obscurely 3-nerved), spatulate to narrowly or broadly obovate (petiolate), 14–48 × 2.5–20 mm, tips mucronate, faces abaxially tomentose, adaxially gray-pubescent to floccose-glabrescent. Cauline leaves linear, 8–35 mm, distal flagged. Heads 4–8(–13) in corymbiform arrays. Involucres: staminate (very uncommon) 6 mm; pistillate 6–9 mm. Phyllaries distally white or cream Corollas: staminate 3.5 mm; pistillate 3.5–6 mm. Cypselae 0.9–1.5 mm, minutely papillate; pappi: staminate 4 mm; pistillate 5.5–7 mm. 2n = 56, 84 (under A. neodioica).

Flowering mid spring–early summer. Pastures, dry fields, openings in woodlands and forests, and rock barrens and dry lake shores; 0–2200 m; St. Pierre and Miquelon; Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.W.T., N.S., Ont., P.E.I., Que., Sask.; Colo., Conn., Del., Idaho, Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Mont., Nebr., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Oreg., Pa., R.I., S.Dak., Tenn., Vt., Va., Wash., W.Va., Wis., Wyo.

Subspecies neodioica is most common in the eastern half of the range of Antennaria howellii; it is also found sporadically as far west as Washington and British Columbia. Antennaria virginica is likely the primary sexual progenitor of apomicts in subsp. neodioica (R. J. Bayer 1985).


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