Notes:
This species can be recognized by its very short deciduous stipules that are spathulate and truncate with deciduous glands along their margins, together with medium-sized leaves that are petiolate, acute to obtuse at the base, and have well developed crypt domatia; cymose pedunculate inflorescences with regularly dichasial white axes; very short calyx limbs; and subglobose, perhaps white fruits. This species is not well known, and its flowers have not yet been documented. Rudgea isthmensis is apparently a narrow endemic of central Panama, where several other endemic Rubiaceae are found rhough some of these also range to southern Costa Rica (e.g., Isertia scorpioides) and northern Colombia (e.g., Psychotria fendleri). Rudgea isthmensis is similar to Rudgea cornifolia and Coussarea loftonii.
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