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Published In: Synopsis Plantarum 2(1): 128. 1807[1806]. (Nov 1806) (Syn. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 8/25/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native


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2. Pycnanthemum muticum (Michx.) Pers. (clustered mountain mint)

Pl. 440 a, b; Map 1983

Stems 40–110 cm long, moderately to densely pubescent on the angles and sides with mostly short, curled hairs, occasionally with a few longer, spreading hairs. Leaves sessile or nearly so. Leaf blades 3–8 cm long, 15–40 mm wide, ovate to broadly lanceolate or oblong-ovate, mostly rounded to cordate at the base, the margins usually finely toothed, the upper surface glabrous or sparsely short-hairy, mostly along the veins (rarely the uppermost pair whitened with dense, short, curled hairs), usually green, the undersurface usually green, glabrous or sparsely to moderately short-hairy, mostly along the veins. Inflorescences relatively dense, often appearing broadly rounded, often appearing sessile or nearly so, only the lowermost branches observable. Bracts leaflike, whitened with dense, short, curled hairs on the upper surface, glabrous or nearly so on the undersurface. Bractlets 1–3 mm long, linear to narrowly lanceolate. Calyces 3–5 mm long, actinomorphic, densely pubescent with minute, appressed hairs, mostly above the midpoint, lacking longer bristly hairs on the margins or tip, the lobes all similar in size and shape 0.5–1.5 mm long, narrowly triangular, sharply pointed. Corollas 4–7 mm long, white to pale pinkish-tinged or pale lavender. Nutlets 1.0–1.4 mm long, glabrous. 2n=ca. 108. July–September.

Uncommon in the Mississippi Lowlands Division (eastern U.S. west to Missouri and Texas). Bottomland forests; also ditches, roadsides, and grassy disturbed areas.

Where this species grows in proximity to P. albescens, rare putative hybrids have been collected.



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