Monarda

Horsemint

Annual or perennial herbs, subshrubs or shrubs to 1.5 m high. Leaves simple, serrate to nearly entire, very odoriferous when crushed. Flowers arranged in a single terminal cluster of flowers, or flowers arranged in interrupted spikes. The flower clusters usually subtended by white, yellow, lavender or purple bracts. Calyx tubular, 13-15 nerved, usually densely pubescent within at the orfice, the lobes similar in size and shape. Corollas strongly 2-lipped, white, yellowish or purplish; lower lips 3-lobed. Stamens 2. Ovary deeply 4-lobed; nutlets oblong with smooth surfaces. Base chromosome numbers, x = 8, 9, 11, 12, 17.

The genus name honors Nicolas Monardes, author of numerous articles on medicinal and useful plants during the latter half of the 16th century (Fernald 1950).

REFERENCES

Correll, D.S. & M.C. Johnston. 1970. Monarda, in Manual of the Vascular Plants of Texas 1370-1375. Texas Research Foundation, Renner, Texas.

Fernald, M.L. 1950. Gray's Manual of Botany [8th ed.] 2: 1236-1238. American Book Co., New York, New York.

McClintock, E. & C. Epling. 1942. A review of the genus Monarda. Univ. Calif. Publ. Bot. 20: 147-194.

Scora, R. 1967. Interspecific relationships in the genus Monarda (Labiatae). Univ. Calif. Publ. Bot. 41: 1-71.

Shinners, L.H. 1953. Nomenclature of the varieties of Monarda punctata L. (Labiatae). Field & Lab. 21: 89-92.

Turner, B.L. 1994. Taxonomic treatment of Monarda (Lamiaceae) for Texas and Mexico. Phytologia 77: 56-79.

A very distinctive and common genus with about 20 species. One might think that the genus Monarda, which is an abundant roadside weed over most of Texas, would have been adequately studied taxonomically, especially since two inclusive systematic treatments of the genus by well-trained workers have appeared within the last 55 years (McClintock & Epling 1942; Scora 1967). But, as indicated by Turner (1994) the genus has been inadequately studied, especially in Texas and northern Mexico where most of the taxa are centered. Correll and Johnston (1970) recognized about 20 taxa distributed among 12 species, whereas Turner (1994) recognized 18 taxa in 11 species; we have followed the latter treatment in the present account.

Key to Texas Genus & Species Descriptions

Images of Texas Species of Monarda

Both images for each species are the same. The smaller images (approximately 670k) will load faster; the larger images (approximately 7.5M) are available for more detailed review but take longer to load.

M. citriodora  var. citriodora
citriodora var. citriodora 671k
citriodora var. citriodora 7.46M
M. citriodora   var. parva
citriodora var. parva 677k
citriodora var. parva 7.52M
M. clinipodioides
clinipodioides 667k
clinipodioides 7.41M
M. fistulosa   var. menthifolia
fistulosa var. menthifolia 677k
fistulosa var. menthifolia 7.52M
M. fistulosa   var. mollis
fistulosa var. mollis 661k
fistulosa var. mollis 7.35M
M. fruticulosa
fruticulosa 661k
fruticulosa 7.35M
M. lindheimeri
lindheimeri 665k
lindheimeri 7.40M
M. maritima
maritima 654k
maritima 7.27M
M. pectinata
pectinata 657k
pectinata 7.30M
M. punctata   var. correlli
punctata var. correlli 659k
punctata var. correlli 7.33M
M. punctata   var. intermedia
punctata var. intermedia 665k
punctata var. intermedia 7.39M
M. punctata   var. lasiodonta
punctata var. lasiodonta 661k
punctata var. lasiodonta 7.35M
M. punctata   var. occidentalis
punctata var. occidentalis 658k
punctata var. occidentalis 7.31M
M. russeliana
russeliana 684k
russeliana 7.60M
M. stanfieldii
stanfieldii 658k
stanfieldii 7.32M
M. viridissima
viridissima 661k
viridissima 7.36M

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