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1 December 2009 New Taxa from the Mamberamo River of Papua Province, Indonesia: Ardisia lammersiana (Myrsinaceae) and Psychotria leptothyrsa Var. Defretesiana (Rubiaceae)
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Abstract

Ardisia lammersiana (Myrsinaceae) and Psychotria leptothyrsa var. defretesiana (Rubiaceae) are described from the Conservation International Mamberamo River Expedition. The new plants are locally common understory shrubs from tributaries of the lower drainage, occurring primarily in seasonally flooded forest. Among the New Guinea species in subgen. Akosmos, Ardisia lammersiana is easily identified by its long peduncles (7.0–10.5 cm), long pedicels (13–20 mm), and white flowers. The second novelty (Psychotria leptothyrsa var. defretesiana) is distinguished by its architectural form, obtuse leaf-blades, erect panicles, and 3–4-ridged pyrenes.

© President and Fellows of Harvard College, 2009.
W. Takeuchi "New Taxa from the Mamberamo River of Papua Province, Indonesia: Ardisia lammersiana (Myrsinaceae) and Psychotria leptothyrsa Var. Defretesiana (Rubiaceae)," Harvard Papers in Botany 14(2), (1 December 2009). https://doi.org/10.3100/025.014.0209
Published: 1 December 2009
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