Notes
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This species is characterized by its rather robust habit and leaves; its pedunculate, branched, several-flowered inflorescences; its rather well developed, lobed calyx limb; and its corollas with the tube ca. 5.5 cm long and the buds apparently obtuse. In the protologue it is noted to be similar to Ixora hookeri, and these were distinguished there only by the form of the leaf apices, the stipule lobes, and the inflorescence cymes; these are variable features in most Rubiaceae species found in littoral forest, and the distinction between these may deserve re-evaluation. The stipule illustrated in the protologue seems to be inaccurate, and may have been drawn from a misunderstanding of the description rather than a specimen. The protologue notes that a few occasional flowers are 5-lobed rather than 4-lobed; this variation is found in many Rubiaceae species.
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