A molecular phylogeny of the grass subfamily Panicoideae (Poaceae) shows multiple origins of C4 photosynthesis.
Giussani, Liliana M.; Cota-Sánchez, J. Hugo; Zuloaga, Fernando O.; American Journal of Botany, 2001, vol. 88, issue 11, p 1993, ISSN 00029122. ISBN 00029122.

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