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. 2013 Jul 23;4:250. doi: 10.3389/fpls.2013.00250

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Copyright © 2013 Kellogg, Camara, Rudall, Ladd, Malcomber, Whipple and Doust.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.

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(A–C) Hordeum vulgare (Triticeae). (A,C) Distichous bracts with broad primary branch primordia in their axils; (B) distichous bracts. (D–F) Avena sativa (Poeae). (D) distichous bract formation shortly after the transition to flowering; (E), early development of the terminal spikelet; (F), later stage of spikelet development, with additional branching obscuring the primarily distichous pattern. im, inflorescence meristem; pb, primary branch; b, bract; sm, spikelet meristem; g, glume. Scale bars: (A–E), 100 μm, (F), 500 μm.