| 1 |
Stems and branches distinctly 4-angled, with a line of hairs from base of each leaf; leaves distinctly crenate; teeth of upper calyx lip 3/5 as long as lip
(1)
|
Thymus disjunctus
|
| 1 + |
Stems and branches mostly terete, rarely indistinctly 4-angled, hairy throughout, or branches occasionally with a line of hairs from base of each leaf.
|
(2)
|
| 2 (1) |
Inflorescences spicate or subcapitate; all upper branches fertile.
|
(3)
|
| 2 (1) + |
Inflorescences capitate or slightly elongated in fruit; some upper branches infertile.
|
(4)
|
| 3 (2) |
Stem internodes less than 1 cm; leaves hairy; inflorescences to 5 cm; plants monoecious
(2)
|
Thymus mandschuricus
|
| 3 (2) + |
Stem internodes more than 2 cm; leaves glabrous or sparsely puberulent; inflorescences to 20 cm or more; plants gynodioecious
(3)
|
Thymus marschallianus
|
| 4 (2) |
Leaves hairy.
|
(5)
|
| 4 (2) + |
Leaves glabrous.
|
(6)
|
| 5 (4) |
Fertile branchlets villous; stem with ascending sterile branches; leaves serrate
(4)
|
Thymus amurensis
|
| 5 (4) + |
Fertile branchlets pubescent; stem with trailing sterile branches; leaves entire
(5)
|
Thymus curtus
|
| 6 (4) |
Leaves ± asymmetrical
(6)
|
Thymus inaequalis
|
| 6 (4) + |
Leaves symmetrical.
|
(7)
|
| 7 (6) |
Teeth of upper calyx lip triangular or subtriangular, less than 1/3 as long as upper lip.
|
(8)
|
| 7 (6) + |
Teeth of upper calyx lip lanceolate.
|
(11)
|
| 8 (7) |
Teeth of upper calyx lip not ciliate or only minutely hispid.
|
(9)
|
| 8 (7) + |
Teeth of upper calyx lip ciliate.
|
(10)
|
| 9 (8) |
Leaf veins rather robust, elevated abaxially
(9)
|
Thymus altaicus
|
| 9 (8) + |
Leaf veins rather slender, slightly elevated abaxially
(8)
|
Thymus mongolicus
|
| 10 (8) |
Leaves elliptic, rarely ovate
(7)
|
Thymus proximus
|
| 10 (8) + |
Leaves ovate
(8)
|
Thymus mongolicus
|
| 11 (7) |
Teeth of upper calyx lip not ciliate or only minutely hispid
(9)
|
Thymus altaicus
|
| 11 (7) + |
Teeth of upper calyx lip ± ciliate, rarely not ciliate.
|
(12)
|
| 12 (11) |
Stems slender, numerous, tufted, arising from robust rhizomatous base, ascending; leaves greenish when dry; calyx with distinctly raised veins
(10)
|
Thymus nervulosus
|
| 12 (11) + |
Stem robust or ± trailing, obliquely ascending to horizontal; leaves brownish when dry; calyx with indistinctly raised veins
(11)
|
Thymus quinquecostatus
|
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