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Dissections:
Phragmites australis

PHRAGMITES Adanj.
Plants hermaphroditic, rhizomatous or stoloniferous, perennial. Culms erect to ascending (more than 2 m tall), glabrous; internodes hollow, terete. Leaves cauline, somewhat distichous; sheaths terete, margins open; auricles present or absent; ligules a short ciliate membrane; blades flat or involute, linear, lax. Panicles with primary branches drooping at maturity, contracted (dense and nodding). Spikelets solitary, laterally compressed, disarticulation above the glumes, awned or awnless; rachilla long pilose, not extended beyond upper floret; pedicellate; florets 3-9, reduced floret at base (1), perfect florets several, and reduced floret (1) at apex, callus hairy; glumes 2, 3-5- veined, very unequal, shorter than first floret, glabrous, awnless; lemmas the first 3-veined, second 1-3-veined, membranous, glabrous, apex entire (acuminate), awned or awnless; awn when present (1) apical and straight; paleas 2- veined (short), awnless, glabrous. Stamens 3; anthers pale yellow. Base chromosome number x=6. A widely distributed grass genus of about three species.