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Notes:
This species is characterized by its rather robust habit, triangular stipules that are divided into several triangular segments, petiolate medium-sized leaves, shortly pedunculate inflorescences with the flowers subsesssile in one to several small heads, its medium-sized fruits, and its remarkably long corollas. The corolla tubes are about 45-60 mm long. Rudgea klugii is similar to Rudgea graciliflora, Rudgea obtusa, and Rudgea lanceifolia. Prolonged corolla tubes are also found in Rudgea longiflora and species similar to it. Zappi (2006) circumscribed Rudgea graciliflora to Rudgea klugii, although she previously had recognized it as distinct (Zappi, 2004). However the plants described as Rudgea klugii differ from of the eastern Amazon basin in their longer calyx limbs (2--3.5 mm) and corolla lobes (12--15 mm) along with their generally brown drying color, vs. shorter calyx limbs (ca. 0.5 mm) and corolla lobes (6--8 mm) and generally green drying color in Rudgea graciliflora. Rudgea klugii is provisionally separated on this web page.
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