in J. T. Kartesz and C. A. Meacham, Synth. N. Amer. Fl., nomencl. innov. 30. 1999.
Annuals or biennials (often sweetly fragrant), 40–90 cm; taprooted. Stems stipitate-glandular throughout (usually persistently lightly white-tomentose distally). Leaf blades (not crowded, internodes mostly 5+ mm) lanceolate to oblanceolate, 3–10 cm × 3–13 mm (distal linear), bases not clasping, decurrent 5–10 mm, margins flat to slightly revolute, faces weakly bicolor, abaxial tomentose, adaxial stipitate-glandular, otherwise glabrescent or glabrous. Heads in corymbiform arrays. Involucres campanulo-subglobose, 4.5–5.5 mm. Phyllaries in 4–5 series, stramineous to creamy (hyaline, shiny), ovate to ovate-oblong, glabrous. Pistillate florets 47–101(–156). Bisexual florets 5–12[–21]. Cypselae not ridged, ± papillate-roughened.
Phenology: Flowering July–Oct.
Habitat: Dry, open habitats, pastures, open woods or edges, roadsides
Elevation: 50–2600(–3000) m
Alta., B.C., Man., N.B., N.S., Ont., P.E.I., Que., Sask., Ariz., Calif., Colo., Conn., Idaho, Ill., Ind., Maine, Mass., Mich., Minn., Mont., N.H., N.Mex., N.Y., Ohio, Oreg., Pa., S.Dak., Tenn., Utah, Vt., Va., Wash., W.Va., Wis., Wyo., Mexico.
Pseudognaphalium macounii is recognized by its stipitate-glandular, proximally glabrescent stems, bicolor and decurrent leaves, relatively large and many-flowered heads, and hyaline, shiny phyllaries. Reports of P. macounii from Texas are based on specimens of P. viscosum.