|D. scabra||Natural Hybrid||D. waianapanapaensis|
This hybrid combination is fairly common where the two parental species are in contact in the vicinity of Wai Anapanapa and Koolau Gap, E Maui. Eight individuals had a mean pollen stainability of 71% and exhibited a maximum chromosome pairing configuration of 12II + 1M3 during meiosis. Several formal names have been ascribed to this hybrid combination, including Railliardia coriacea Sherff, Railliardia thyrsiflora Sherff, Railliardia thyrsiflora var. cernua Keck, Railliardia ternifolia Sherff, Railliardia demissifolia var. dolichophylla H. St. John.
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