| 1 |
Stems quadrangular |
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25 Mazus lanceifolius |
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Stems terete or somewhat ribbed, never quadrangular. |
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(2) |
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| 2 (1) |
Ovary hairy; stems basally woody with age; calyx veins conspicuous. |
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(3) |
| + |
Ovary glabrous; stems herbaceous (woody in M. celsioides); calyx veins inconspicuous. |
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(6) |
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| 3 (2) |
Plants relatively stout, erect, never rooting from nodes; flowers ca. 1.5 cm or more; calyx funnelform, 0.8-1.6 cm in fruit, over 1 cm in diam. |
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(4) |
| + |
Plants slender, procumbent, rooting from nodes; flowers less than 1.5 cm; calyx campanulate, 0.3-0.8 cm in fruit, less than 1 cm in diam. |
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(5) |
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| 4 (3) |
Stem leaves sessile; corolla 1.5-2 cm; capsule ovoid |
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1 Mazus stachydifolius |
| + |
Stem leaves petiolate; corolla ca. 2.6 cm; capsule globose |
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2 Mazus caducifer |
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| 5 (3) |
Basal leaves caudate; calyx lobes triangular-lanceolate; corolla upper lip lobes apically acute, margin entire |
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3 Mazus spicatus |
| + |
Basal leaves not caudate; calyx lobes ovate; corolla upper lip lobes apically subtruncate, margin with few small irregular teeth near apex |
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4 Mazus xiuningensis |
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| 6 (2) |
Plants stoloniferous. |
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(7) |
| + |
Plants not stoloniferous. |
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(15) |
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| 7 (6) |
Plants glabrous or soon glabrescent. |
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(8) |
| + |
Plants pubescent, sometimes only when young. |
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(11) |
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| 8 (7) |
Stems less than 10 cm tall. |
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(9) |
| + |
Stems more than 10 cm tall. |
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(10) |
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| 9 (8) |
Basal leaves thin papery; bracts ca. 1 mm |
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7 Mazus rockii |
| + |
Basal leaves fleshy; bracts 5-12 mm |
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15 Mazus longipes |
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| 10 (8) |
Stems erect to obliquely ascending, 10-15 cm tall; middle lobe of corolla lower lip obovate, smaller than lateral lobes |
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21 Mazus miquelii |
| + |
Stems creeping, to 30 cm; middle lobe of corolla lower lip narrowly ovate, longer than lateral lobes |
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23 Mazus gracilis |
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| 11 (7) |
Stem leaves often alternate. |
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(12) |
| + |
Stem leaves often opposite or plants scapose. |
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(13) |
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| 12 (11) |
Stems erect to obliquely ascending, 10-15 cm tall |
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21 Mazus miquelii |
| + |
Stems procumbent, 30-45 cm |
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24 Mazus procumbens |
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| 13 (11) |
Stems less than 8 cm tall |
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16 Mazus surculosus |
| + |
Stems to 30 cm tall. |
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(14) |
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| 14 (13) |
Basal leaf blade suborbicular to broadly ovate; pedicel 1.5-2.5 cm; calyx lobes less than 1/3 of calyx length |
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20 Mazus henryi |
| + |
Basal leaf blade spatulate; pedicel 0.5-0.6 cm; calyx lobes ca. 1/2 of calyx length |
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22 Mazus alpinus |
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| 15 (6) |
Stem leaves 2-4 pairs or numerous. |
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(16) |
| + |
Stem leaves absent or 1 or 2. |
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(21) |
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| 16 (15) |
Calyx lobes ca. 1/3 of calyx length. |
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(17) |
| + |
Calyx lobes ca. 1/2 of calyx length. |
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(18) |
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| 17 (16) |
Stems basally woody; leaf margin irregularly serrate, pandurately lobed below middle; stems and leaves abaxially green |
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12 Mazus celsioides |
| + |
Stems herbaceous; leaves margin irregularly sinuate-toothed; stems and leaves abaxially purple |
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13 Mazus solanifolius |
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| 18 (16) |
Perennials, white villous. |
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(19) |
| + |
Annuals, glabrous or sparsely pubescent. |
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(20) |
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| 19 (18) |
Stem leaves crowded; corolla purple-red, lower middle lobe longer than other lobes |
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14 Mazus kweichowensis |
| + |
Stem leaves 2-4 pairs; corolla blue-purple, lower middle lobe shorter than other lobes |
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18 Mazus saltuarius |
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| 20 (18) |
Pedicel 0.3-1.2 cm; corolla lower lip lobes obovate; upper lobes ovate-triangular |
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17 Mazus pumilus |
| + |
Pedicel ca. 1.5 cm; corolla lower lip lobes broadly ovate; upper lobes oblong-ovate |
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19 Mazus fukienensis |
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| 21 (15) |
Corolla 2-3 cm, lobes usually erose or fimbriate apically; leaves usually to 20 cm. |
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(22) |
| + |
Corolla less than 2 cm, lobes not fimbriate; leaves less than 12 cm. |
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(23) |
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| 22 (21) |
Plants glabrous or sparsely villous; leaves thick papery to subleathery; pedicel 1-15 cm |
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5 Mazus omeiensis |
| + |
Plants densely white or rusty pubescent; leaves papery; pedicel to 4 cm |
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6 Mazus pulchellus |
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| 23 (21) |
Plants mostly over 10 cm; flowers usually over 10. |
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(24) |
| + |
Plants less than 10 cm; flowers less than 10. |
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(25) |
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| 24 (23) |
Pedicel ca. 5 cm; leaves oblanceolate, margin sharply toothed; flowering stems erect |
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10 Mazus lecomtei |
| + |
Pedicel 1-3 cm; leaves obovate-spatulate, margin obtusely toothed or pinnately lobed; flowering stems not erect |
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11 Mazus fauriei |
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| 25 (23) |
Leaf margin entire; flowers 1-3; pedicel to 3 cm |
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9 Mazus oliganthus |
| + |
Leaf margin dentate or shallowly lobed; flowers 4-10; pedicel less than 2 cm. |
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(26) |
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| 26 (25) |
Plants glabrous or subglabrous; calyx lobes subulate-triangular; corolla yellow or dark purple |
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7 Mazus rockii |
| + |
Plants sparsely white villous; calyx lobes oblong-lanceolate; corolla white or white with purple spots |
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8 Mazus humilis |
