In: Phyton 54, Fasc. 1 (2014): S. 1–26 with 6 figures DOI: 10.12905/0380.phytons54(1)2014-0001
Key words: Pinaceae, Pinus latteri, Pinus merkusii, Pinus ustulata. – Taxa circumscription, taxonomy, typifications. – Flora of Sumatra, Philippines, Indochina.
Businský R. 2014. The Pinus merkusii agg. (Pinaceae): Literature review, taxa delimitation and typifications. – Phyton (Horn, Austria) 54(1): 1–26, with 6 figures.
Three taxa constituting the Pinus merkusii agg., a group with separate phylogeny that is native to tropical SE Asia, have been heterogeneously classified or adopted in modern literature. This situation has been caused by the incomplete comparison of material and missing collective knowledge from important areas of its natural distribution. An ongoing taxonomic study of Pinus in East Asia has revealed the need to review relevant literature sources and to identify and properly typify all names pertaining to the aggregate to prevent further ambiguities. The three accepted taxa were morphologically compared in detail on the bases of field surveys and representative collections were sampled from six geographic regions representing the most important areas of the group’s distribution range. All three of the taxa are accepted at the rank of species: P. merkusii is lectotypified with a designated epitype, P. ustulata is newly elevated from the subspecific rank, and for P. latteri a neotype is selected. The synonyms of the latter species, P. ikedae and P. tonkinensis, are also lectotypified. The different taxonomic concepts adopted by various authors and several published discrepancies are discussed.