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Elymus hystrix (Triticeae). (A–E) Successive stages of distichous bract formation in the plane of the leaves; (F) initiation of primary branch meristems; (G–I), differentiation of spikelet meristems. im, inflorescence meristem; pb, primary branch; b, bract, sm, spikelet meristem, g, glume. Scale bars: (A,B), 50 μm; (C–F), 100 μm; (G–I), 200 μm.
