Grass of the eastern United States and America having spikelets enclosed in prickly burs .

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Grass of the eastern United States and tropical America having spikelets enclosed in prickly burs .

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Spikelets with 1 or 2 florets.

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Spikelets usually 2 per node, or 1 per node at apex and base of spike, 6–10 mm, with 2 or 3 florets.

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Lowest lemma 4–5.5 mm, awn 3–5 mm; spikelets usually with 2 florets.

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Spikelets usually dark purple; glumes unequal; plant often less than 30 cm tall.

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In the grasses bracts are borne in pairs below the spikelets and are called glumes.

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Spikelets usually green or grayish green, occasionally violet tinged; glumes subequal; plant (20–)40–100 cm tall

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Spikelets 1–1.2 mm, florets 2; glumes boat-shaped, keeled, scabrous on vein, ca. 1 mm; lower glume subacute; upper glume truncate, awn 0.3–0.5 mm; lemma of fertile floret broadly boat-shaped, ca. 1.2 mm, leathery, pilose along keel and incurving margins; palea obovate, narrower than lemma, keels scabrous; upper lemma much reduced, cuneate, lying within concave back of palea of fertile floret.

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II. Significant differences exist in 15 external morphological traits of zoysiajaponica such as length of creeping stem, number of spikelets, length of ligules and so on due to affection by different geological environment.

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