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| 1 |
Stipules subulate, erect, crowded at branchlet tips; male inflorescences spicate |
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(2) |
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Stipules broadly lanceolate to ovate; male inflorescences paniculate with 2 or 3(or 4) orders of branching |
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(3) |
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| 2 (1) |
Stipules and budscales chocolate brown, with sparsely spreading white hairs; female spikes with terminal flowers and fruits; male spikes threadlike, flower clusters 1-1.5 mm wide, never malformed. |
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1 M. andamanica |
| + |
Stipules and budscales chestnut brown, glabrous; female flowers and fruits spaced along top of spike; male spikes with ca. 1 mm in diam. axis, flower clusters 3-4 mm wide, often malformed as witches’ brooms. |
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2 M. lowii |
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| 3 (1) |
Leaves peltate, petiole inserted (0.3-)1-4 cm from margin; branchlets often 8-10 mm thick |
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(4) |
| + |
Leaves not or only narrowly peltate with petiole inserted 0.1-0.3 cm from margin; branchlets 2-4 mm thick |
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(6) |
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| 4 (3) |
Twigs strongly angled and ridged, densely fawn-furfuraceous; stipules lanceolate, 7-8 mm. |
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3 M. denticulata |
| + |
Twigs terete, furfuraceous, glabrescent; stipules ovate to broadly ovate or triangular, 1.5-3 mm |
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(5) |
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| 5 (4) |
Stipules ovate, erect, subpersistent; leaves without glands near petiole insertion. |
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4 M. tanarius var. tomentosa |
| + |
Stipules broadly ovate, sometimes recurved, soon caducous; leaves nearly always with a few conspicuous glands on main veins near petiole insertion. |
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5 M. indica |
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| 6 (3) |
Leaf apex caudate, sometimes tricuspid; stipules filiform, 3-4 mm; styles ca. 10 mm, threadlike. |
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6 M. kurzii |
| + |
Leaf apex acute to acuminate or broadly cuspidate-acuminate; stipules ovate-oblong or lanceolate, 5-14 × 2-4 mm; styles to 7 mm |
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(7) |
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| 7 (6) |
Leaf blade 10-25 × 3.5-7 cm; male inflorescences 6-10 cm, branches ca. 3 cm; fruiting pedicel 7-15 mm. |
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7 M. henryi |
| + |
Leaf blade 8-16 × 4-15 cm; male inflorescences 8-14 cm, branches 3-8 cm; fruiting pedicel 2-7 mm |
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(8) |
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| 8 (7) |
Twigs glabrous; stipules glabrous, somewhat persistent. |
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8 M. sinensis |
| + |
Twigs yellowish brown tomentose when young; stipules furfuraceous or tomentose, sometimes caducous |
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(9) |
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| 9 (8) |
Stipules ovate-lanceolate or triangular, 4-6 mm wide, tomentose, recurved, subpersistent; leaf margin repand or subentire. |
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9 M. pustulata |
| + |
Stipules lanceolate, 2-3 mm wide, pubescent, erect, soon caducous; leaf margin repand or coarsely serrate. |
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10 M. sampsonii |
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