GENUS 32. MINT FAMILY. 141 
32. THYMUS [Tourn.] L. Sp. Pl. 590. 1753. 
Perennial herbs, or low shrubby creeping plants, with small mostly entire leaves, and 
small purple flowers clustered in terminal glomerules, or in the axils of the leaves. Calyx 
ovoid, villous in the throat, 10-13-nerved, 2-lipped, the upper lip erect-spreading, 3-toothed, 
the lower 2-toothed, its teeth long and slender. Corolla-limb 2-lipped, the upper lip erect, 
emarginate, the lower spreading, 3-cleft. Stamens 4, more or less didynamous, mostly ex- 
serted; anthers 2-celled, the sacs parallel or divergent. Ovary deeply 4-parted; style 2-cleft 
at the summit. Nutlets ovoid or oblong, smooth. ([Greek, incense.] 
About 50 species, natives of the Old World, mostly European. Type species: Thymus vulgaris L. 
1. Thymus Serpyllum L. Wild or Creeping 
Thyme. Mother of Thyme. Fig. 3659. 
Thymus Serpyllum L. Sp. Pl. 590. 1753. 
Stems more or less pubescent in lines, very slender, 
procumbent, tough, much branched, 4-12’ long, com- 
monly forming dense mats. Leaves oblong or ovate- 
oblong, petioled, obtuse at the apex, usually narrowed 
at the base, entire, glabrous, or sometimes ciliate, 2-5” 
long; bracts similar to the leaves, but smaller; flowers 
numerous in verticillate clusters crowded in dense short 
terminal spikes, or also in the upper axils; calyx dis- 
tinctly 2-lipped, the tube usually pubescent and the teeth 
ciliate; corolla longer than the calyx. 
In thickets, woods, and along roadsides, Nova Scotia to 
southern New York and North Carolina. Naturalized from 
Europe. Native also of Asia. June-Sept. Old English 
names, brotherwort, hillwort, penny-mountain, shepherd’s- 
thyme. 
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33- KOELLIA Moench, Meth. 407. 1794. 
[BRACHYSTEMON and PycNANTHEMUM Michx. FI. Bor. Am. 2: 5, 7. 1803.] 
Perennial erect, mostly branched, glabrous cinereous canescent or pubescent herbs, with 
small white or purple-dotted flowers, in terminal or sometimes also axillary capitate glom- 
erules or cymose clusters. Calyx ovoid, oblong or tubular, 10-13-nerved, equally or more 
or less unequally 5-toothed, not villous in the throat, the 2 upper teeth sometimes united 
below. Corolla 2-lipped, the upper lip emarginate or entire, the lower 3-cleft, its lobes 
obtuse. Stamens 4, didynamous, nearly equal, or the lower pair a little longer; anther-sacs 
parallel. Ovary deeply 4-parted; style slender. Nutlets smooth, pubescent, or roughened. 
[Named for J. L. C. Koelle, a German botanist of the eighteenth century.] 
About 17 species, natives of North'America. Besides the following, 1 occurs in California and 
several in the Southern States. Type species: Koellia capitata Moench. Mostly very fragrant. 
Sometimes called Basil, the proper name of Calamint or Ocymum. 
* Leaves prevailingly linear, linear-lanceolate or oblong-lanceolate. 
Calyx-teeth ovate-triangular, acute, one-fourth as long as the tuLe. 1. K. virginiana. 
Calyx-teeth subulate, lance-subulate or bristle-tipped. 
Leaves linear or lanceolate; calyx-teeth subulate or lanceolate. 
Leaves linear or narrowly linear-lanceolate, entire. 2. K. flexuosa, 
Leaves lanceolate, entire, or usually serrate. 
Bracts appressed, erect; clusters dense. 
Hirsute or pilose; leaves mainly entire. 3. K. pilosa. 
Puberulent, short-pubescent, or glabrate; leaves mostly denticulate. 
4. K. verticillata. 
Bracts spreading ; clusters loose. 5. K. clinopodioides. 
Leaves oblong to linear-oblong, obtuse or subacute; calyx-teeth awn-like. 6. K. hyssopifolia. 
** Leaves prevailingly ovate, ovate-oblong or ovate-lanceolate. 
Calyx-teeth bristle-tipped or subulate. 
Bracts appressed; clusters dense; calyx-teeth bristle-pointed. 7. K. aristata. 
Bracts spreading ; clusters loose; calyx-teeth subulate. ; 
Calyx-teeth about one-half as long as the tube. 8. K. incana. . 
Calyx-teeth as long as the tube. 9. K. pycnanthemoides. 
Calyx-teeth triangular, triangular-lanceolate or lanceolate. 
Bracts spreading; clusters loose; calyx-teeth short. 10. K, albescens. 
Bracts appressed ; clusters dense. : 
Bracts canescent; leaves firm, acute. 11. K. mutica. 
Bracts ciliate or villous; leaves membranous, acuminate. 12. K. montana. 
