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| 1 |
Culm 15–25(–30) m, 10–20(–30) cm in diam.; spikelets acute, with 5–8 florets, florets inseparable and each floret usually closed when mature (open in D. fugongensis) |
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(2) |
| + |
Culm 15–20 m (to 25 m in D. yunnanicus and D. latiflorus), 10–18 cm in diam.; spikelets obtuse or acute, truncate, with 2–8 florets, florets slightly separable from each other and each floret usually open when mature (closed in D. pachystachys) |
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(5) |
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| 2 (1) |
Culm sheath blade reflexed or nearly erect; apex of palea bifid |
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(3) |
| + |
Culm sheath blade erect; apex of palea obtuse |
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(4) |
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| 3 (2) |
Basal culm internodes normal; culm sheath blade reflexed; spikelet 1–1.5 cm; 2-veined between 2 keels of palea. |
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17 D. giganteus |
| + |
Basal culm internodes congested; culm sheath blade nearly erect; spikelet 3–3.5 cm; 5-veined between 2 keels of palea. |
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18 D. sinicus |
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| 4 (2) |
Culm initially white ciliate; bracts basal to inflorescence obviously shorter than pseudospikelets. |
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19 D. calostachyus |
| + |
Culm initially white powdery, not ciliate; bracts basal to inflorescence nearly as long as pseudospikelets. |
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20 D. fugongensis |
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| 5 (1) |
Culm sheath setaceous, or setaceous and tomentose; spikelets 0.5–1.2 × 0.4–0.8 cm, with 4 or 5 florets |
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(6) |
| + |
Culm sheaths glabrous or with readily deciduous setae, becoming glabrous; spikelet 1–1.6(–2.8) × 0.5–1.3 cm, with 5–8 florets |
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(8) |
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| 6 (5) |
Culm internodes glabrous, white powdery initially; abaxial surface of culm sheath with appressed brown setae. |
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25 D. minor |
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Culm internodes with setae or tomentose, without powder |
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(7) |
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| 7 (6) |
Culm sheath with dense black-brown setae and white to light brown tomentum scattered and not clustered into spots; spikelets obovate-triangular, 10–12 × 5–8 mm. |
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26 D. peculiaris |
| + |
Culm sheath with black-brown tomentum and spots of white tomentum; spikelet oblong-ovate, ca. 5 × 4.5 mm. |
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27 D. tomentosus |
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| 8 (5) |
Culms white ciliate or glabrous |
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(9) |
| + |
Culms with appressed setae, or tomentose, or with sparse white powder |
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(10) |
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| 9 (8) |
Ligule 3–4 mm; spikelet 1.7–2.8 × 0.5–1 cm, apex acute; florets inseparable from each other and each floret closed when mature, floret white ciliate. |
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21 D. pachystachys |
| + |
Ligule 1–2 mm; spikelet 1.2–1.5 × 0.7–1.3 cm, apex obtuse; florets partially separable from each other, each open when mature, only upper floret yellow-brown ciliate. |
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22 D. latiflorus |
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| 10 (8) |
Apex of culm sheath truncate or projected at center, 6–11 cm wide; ligule 1–4 mm; internodes of flowering branches white-brown or yellow-brown tomentose. |
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23 D. jianshuiensis |
| + |
Apex of culm sheath depressed, 3–7 cm wide; ligule 5–8 mm; internodes of flowering branches yellow-brown ciliate. |
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24 D. yunnanicus |
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