|Standard Cyclopedia of Horticulture|
Pycnanthemum (Greek, dense and blossom; referring to compact flower-heads). Labiatae. Mountain Mint. Basil. Hardy aromatic perennial herbs suitable for the flower-garden. Stems corymbosely branched above: lvs. entire, glabrous or pubescent, nearly sessile: infl. dense, many-fld. whorls, crowded with bracts and usually forming terminal heads or close cymes; fls. whitish or purplish, late summer and early autumn; calyx about 13-nerved, naked in the throat; corolla short, more or less 2-lipped; stamens 4, lower pair rather longer than the upper, which are sometimes abortive.—About 18 species, N. Amer. The oldest generic name of this is Koellia, which is used by many, but Pycnanthemum is maintained in the list of "nomina conservanda" as accepted by the Vienna Congress. The genus differs from Monarda in having smaller and canescent fl.-heads. Pycnanthemums are mint-like plants of easy cult. in any good soil. The following grow 1-3 ft. high, and bear fl.- heads 1/2in. across or less.
P. Monardella, Michx., is properly Monarda clinopodia, Linn. A perennial herb with slender, usually simple st. 1-3 ft. high: lvs. lanceolate to ovate, membranaceous, bright green, slender-petioled, 2—4 in. long: fl.-heads solitary, terminal; corolla yellowish, 1 in. long or less. June-Aug. Fields, Ont. to Ga. B.B. 3:102. F. W. Barclay. F. Tracy Hubbard.
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- Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963
- w:Pycnanthemum. Some of the material on this page may be from Wikipedia, under the Creative Commons license.
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