Calamagrostis × acutiflora, called feather reed-grass, is a naturally occurring hybrid species of grass in the genus Calamagrostis, occasionally found in Europe and Asia.

[2] Its cultivar 'Karl Foerster' has gained the Royal Horticultural Society's Award of Garden Merit.

[3] It is a hybrid of Calamagrostis arundinacea and Calamagrostis epigejos, both widespread Eurasian species.

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