| 1 |
Male flowers sessile. |
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(2) |
| + |
Male flowers pedicellate. |
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(10) |
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| 2 (1) |
Stamens 3 fertile and 3 sterile or reduced to filaments. |
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(3) |
| + |
Stamens all fertile. |
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(4) |
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| 3 (2) |
Leaf blade drying green, margin usually entire, sometimes toothed; anther connectives not fork-shaped at maturity |
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9 D. gracillima |
| + |
Leaf blade drying black or nearly so, margin entire though often undulate; anther connectives fork-shaped at maturity |
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10 D. collettii |
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| 4 (2) |
Leaf blade usually with short, stiff hairs or long papillae mainly along veins; anthers 3 introrse and 3 extrorse. |
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(5) |
| + |
Leaf blade glabrous; anthers all similar. |
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(6) |
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| 5 (4) |
Leaf blade distinctly lobed or with strongly undulate margin, rarely margin only obscurely undulate, abaxially usually ± uniformly minutely papillose-puberulent, hairs yellowish |
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1 D. nipponica |
| + |
Leaf blade ± 3-lobed, lateral lobes very short and broad, sometimes apically emarginate so leaf blade is ± 5-lobed, abaxially often papillose-hispidulous along veins, hairs white |
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6 D. deltoidea |
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| 6 (4) |
Perianth purplish red; leaf blade always drying dark, often narrowly peltate. |
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(7) |
| + |
Perianth orange or light yellow; leaf blade often drying greenish, not peltate. |
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(8) |
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| 7 (6) |
Perianth lobes 1.2--1.5 × 0.8--1 mm; leaf blade triangular-ovate, usually ± 3-lobed by enlargement of basal lobes |
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4 D. zingiberensis |
| + |
Perianth lobes 0.8--1.2 × 0.6--0.8 mm; leaf blade broadly triangular-ovate, sometimes 3- to obscurely 5-lobed |
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5 D. sinoparviflora |
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| 8 (6) |
Leaves often prickly on petiole and sometimes along main veins; stem with many prickles proximally |
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18 D. birmanica |
| + |
Leaves not prickly; stem not prickly or inconspicuously prickly at nodes (more easily felt than seen). |
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(9) |
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| 9 (8) |
Leaf blade membranous, margin entire to slightly undulate; nodes usually not prickly |
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7 D. panthaica |
| + |
Leaf blade slightly leathery, margin entire to completely 3-foliolate; nodes often shortly prickly |
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8 D. biformifolia |
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| 10 (1) |
Perianth purple; distal leaves usually 3-foliolate |
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17 D. simulans |
| + |
Perianth orange, yellow, or green; leaves entire to deeply lobed, never compound. |
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(11) |
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| 11 (10) |
Leaf blade drying dark gray to grayish brown or nearly black adaxially. |
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(12) |
| + |
Leaf blade drying green or yellow-green adaxially. |
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(14) |
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| 12 (11) |
Leaf blade of basal leaves palmately bluntly 7-lobed, uniformly hispidulous, densely so abaxially; spikes to 7 cm, usually in axillary panicles to 20 cm |
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11 D. futschauensis |
| + |
Leaf blade ovate to triangular-ovate or nearly triangular-sagittate, glabrous; spikes to 20 cm, sometimes gathered into large, terminal panicles. |
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(13) |
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| 13 (12) |
Rhizomes to 5 cm thick; flowers in cymules of 2--6, rarely solitary, pedicels less than 1.5 mm; leaf blade membranous |
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15 D. chingii |
| + |
Rhizomes to 1.5 cm thick; flowers solitary or paired, pedicels ca. 2.5 mm; leaf blade thinly leathery |
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14 D. poilanei |
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| 14 (11) |
Anther connectives alternately simple and forked; pedicels to 8 mm; petioles 3--12 cm. |
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(15) |
| + |
Anther connectives all similar; pedicels to 3 mm; petioles 4.5--20 cm. |
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(16) |
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| 15 (14) |
Pedicels 1.5--8 mm; petioles 3--5 cm |
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13 D. tenuipes |
| + |
Pedicels to 1.7 mm; petioles 5--12 cm |
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3 D. tokoro |
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| 16 (14) |
Perianth funnelform, lobes not spreading; leaf blade always entire |
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16 D. banzhuana |
| + |
Perianth bowl-shaped to saucer-shaped, lobes spreading; leaf blade of basal leaves often undulate to distinctly lobed. |
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(17) |
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| 17 (16) |
Rhizome 0.7--1.5 cm thick; pedicels 2--3 mm; leaf blade orbicular to broadly ovate, usually shortly 4--7-lobed or coarsely toothed |
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2 D. althaeoides |
| + |
Rhizome (1.5--)2--5 cm thick; pedicels to 1.5 mm; leaf blade triangular or ovate-cordate to unequally 3--7-lobed, often very variable in shape. |
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(18) |
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| 18 (17) |
Flowers usually in cymules or umbellules of 2--4(--7), solitary distally on inflorescence; stamens inserted at middle of perianth lobes; leaf blade drying yellowish green abaxially |
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1 D. nipponica |
| + |
Flowers solitary or paired; stamens inserted at base of perianth; leaf blade drying grayish white abaxially |
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12 D. spongiosa |
