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Key to Sorghum

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1 Rhizomatous perennial; leaves 1-2 cm wide
1 Fibrous-rooted annual; leaves (2-) 3-5 cm wide.
..2 Inflorescence dense, compact; plants 0.5-1.3 m tall
..2 Inflorescence open, with spreading branches; plants 1.0-3.0 m tall
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