| 1 |
Inflorescences interrupted spikate racemes. |
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(2) |
| + |
Inflorescences spikes in panicles. |
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(6) |
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| 2 (1) |
Subrepent herbs, base prostrate, with adventitious roots. |
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(3) |
| + |
Erect herbs. |
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(4) |
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| 3 (2) |
Stems and leaves densely yellow hirsute or yellow strigose; petioles rarely to 1.2 cm; upper leaves sessile |
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15 Pogostemon auricularius |
| + |
Apical part of stems and rachises glandular hairy, pubescent; leaves adaxially glabrescent, abaxially strigose along veins or subglabrous and glandular; petioles 1-4 cm, glandular hairy or pubescent, glabrescent |
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14 Pogostemon menthoides |
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| 4 (2) |
Leaves long falcate, 4-7 mm wide |
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16 Pogostemon falcatus |
| + |
Leaves not long falcate, 15-30 mm wide. |
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(5) |
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| 5 (4) |
Leaves ovate-lanceolate to elliptic, lateral veins 8- or 9-paired; calyx urceolate-campanulate, 2.5 × 3 mm |
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12 Pogostemon hispidocalyx |
| + |
Leaves ovate, lateral veins 3-paired; calyx tubular-campanulate, 3-3.5 mm |
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13 Pogostemon nigrescens |
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| 6 (1) |
Calyx 2-2.5 mm; corolla shorter than calyx; spikes interrupted |
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6 Pogostemon brevicorollus |
| + |
Calyx more than 3 mm; corolla subequal to longer than calyx. |
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(7) |
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| 7 (6) |
Anterior filaments glabrous; plants densely minutely hispid |
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11 Pogostemon xanthiifolius |
| + |
All filaments bearded. |
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(8) |
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| 8 (7) |
Calyx more than 6 mm, densely tomentose outside; leaves circular to broadly ovate; cultivated plants. |
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5 Pogostemon cablin |
| + |
Calyx 3-5 mm, not tomentose outside. |
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(9) |
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| 9 (8) |
Bracts and bracteoles linear-lanceolate to linear; leaves rhombic-lanceolate to ovate, apex acute to short acuminate, base cuneate-attenuate |
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4 Pogostemon formosanus |
| + |
Bracts and bracteoles oblong-lanceolate to ovate; leaves ovate, rhombic-ovate, to ovate-lanceolate. |
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(10) |
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| 10 (9) |
Bracteoles slightly shorter than to longer than calyx. |
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(11) |
| + |
Bracteoles to slightly more than 1/2 as long as calyx. |
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(13) |
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| 11 (10) |
Calyx subtubular, teeth narrowly triangular, subequal or 2 shorter, ca. 1/3 as long as calyx tube |
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1 Pogostemon chinensis |
| + |
Calyx narrowly campanulate, teeth triangular, 1/3-1/2 as long as calyx tube. |
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(12) |
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| 12 (11) |
Calyx teeth ca. 1/3 as long as calyx; corolla ca. 7 mm |
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3 Pogostemon championii |
| + |
Calyx teeth ca. 1/2 as long as calyx; corolla 4-5 mm |
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2 Pogostemon septentrionalis |
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| 13 (10) |
Calyx ca. 3 mm; spikes (3-)5-20 cm × 7-8 mm; stems, branches, and leaves glabrescent |
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7 Pogostemon glaber |
| + |
Calyx more than 3.5 mm; spikes rather robust; stems, branches, and leaves hairy. |
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(14) |
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| 14 (13) |
Leaves lanceolate; corolla ca. 8 mm |
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8 Pogostemon dielsianus |
| + |
Leaves ovate to broadly ovate; corolla ca. 6 mm. |
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(15) |
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| 15 (14) |
Lobes of style 2-2.5 mm; calyx pubescent |
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10 Pogostemon griffithii var. latifolius |
| + |
Lobes of style ca. 1.5 mm; calyx sparsely pubescent on veins or villous (in var. tsingpingensis) |
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9 Pogostemon esquirolii |
