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| 1 |
Inflorescences unisexual; plants monoecious or dioecious; shrubs |
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(2) |
| + |
Inflorescences usually bisexual; plants monoecious; herbs or shrubs |
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(7) |
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| 2 (1) |
Female spikes elongated, pendulous; bracts small, entire, ca. 1 mm; plants dioecious |
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(3) |
| + |
Females spikes less than 10 cm; bracts 3-5 mm, denticulate or serrate; plants monoecious |
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(5) |
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| 3 (2) |
Female bracts ovate-rhombic, 3-7 flowers in each bract; styles 5-7 mm, exserted (cultivated). |
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13 A. hispida |
| + |
Female bracts ovate, solitary flower in each bract; styles 2-5 mm, less conspicuous |
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(4) |
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| 4 (3) |
Ovary and fruit often 2-locular, styles 2, 2-3 mm. |
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14 A. caturus |
| + |
Ovary 3-locular, styles 3, 2.5-5 mm. |
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15 A. suirenbiensis |
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| 5 (2) |
Female bracts broadly ovate, ca. 5 × 8 mm, 7-11-serrate; ovary pubescent, style 6-7 mm; leaves colored, or with red or purple spots (cultivated). |
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18 A. wilkesiana |
| + |
Female bracts 10-denticulate; ovary hirsute or hirtellous, style 2.5-4 mm; leaves green |
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(6) |
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| 6 (5) |
Stipule ovate, ca. 8 mm; female bracts half-orbicular, ca. 5 mm; style ca. 4 mm. |
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16 A. angatensis |
| + |
Stipule lanceolate, ca. 12 mm; female bracts broadly ovate, 3-3.5 mm; style 2.5-3 mm. |
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17 A. akoensis |
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| 7 (1) |
Annual herbs; inflorescences with short slender male portion |
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(8) |
| + |
Shrubs; inflorescences with longer male portion, sometimes unisexual |
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(11) |
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| 8 (7) |
Inflorescences less than 1 cm, subsessile; female bracts deeply 3-5-lobed. |
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4 A. supera |
| + |
Inflorescences more than 1 cm; female bracts not lobed, margin crenate or denticulate |
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(9) |
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| 9 (8) |
Inflorescences with female bracts 1 or 2(-4), ovate-cordate, 14-25 mm; allomorphic female flower absent. |
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1 A. australis |
| + |
Inflorescences with female bracts 3-9, less than 5 mm; allomorphic female flower usually present near apex |
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(10) |
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| 10 (9) |
Branchlets adpressed pubescent when young; female bracts ovate-cordate, crenulate. |
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2 A. indica |
| + |
Branchlets pubescent and sparsely hirsute when young; female bracts fan-shaped, denticulate. |
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3 A. lanceolata |
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| 11 (7) |
Spikes bisexual, peduncle less than 4 mm; female bracts 1-5 |
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(12) |
| + |
Spikes bisexual or unisexual, peduncle more than 5 mm; female bracts usually solitary |
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(13) |
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| 12 (11) |
Leaf blade ovate or narrowly ovate, puberulent along veins; female bracts ca. 2 × 3 mm, margin 4- or 5-toothed; ovary hairy and sparsely shortly echinate. |
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11 A. kerrii |
| + |
Leaf blade rhombic or ovate-rhombic, glabrous; female bracts ca. 6 mm, ca. 11-toothed; ovary densely echinate. |
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12 A. siamensis |
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| 13 (11) |
Leaf apex long acuminate or caudate-acuminate; female sepals (3 or)4(or 5) |
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(14) |
| + |
Leaf apex acute or acuminate; female sepals 3 |
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(15) |
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| 14 (13) |
Adult leaves pilose only along veins; female bracts cupulate, ca. 5 mm; ovary hairy; capsule pilose and scattered tuberculate. |
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5 A. acmophylla |
| + |
Adult leaves uniformly pilose; female bracts suborbicular, 5-7 mm; ovary hairy and shortly echinate; capsule softly many echinate, with pilose hairs, ca. 1 mm. |
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7 A. mairei |
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| 15 (13) |
Stipules subulate or triangular |
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(16) |
| + |
Stipules lanceolate, pilose |
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(17) |
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| 16 (15) |
Adult leaves pilose along midvein, 3-veined, stipules subulate, 1.5-3 mm; female bracts broadly ovate, subglabrous; ovary densely setulose; capsule scattered shortly softly setose. |
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6 A. wui |
| + |
Adult leaves uniformly pilose, venation pinnate, stipules narrowly triangular, ca. 1 mm; female bracts suborbicular, ciliate; ovary hairy; capsule sparsely shortly echinate, pilose. |
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10 A. hainanensis |
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| 17 (15) |
Female bracts 10-12 mm, dentate, pilose. |
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8 A. schneideriana |
| + |
Female bracts ca. 6 mm, denticulate, glabrous. |
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9 A. matsudae |
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