A Revision of Xanthosoma (Araceae). Part 1: Western South America

 

Thomas B. Croat, Xavier Delannay, and Lynn P. Hannon†

 

ABSTRACT

A review of Xanthosoma of Western South America is presented and a total of 124 species occurring in that area are described and illustrated, including 92 new species. New species of Xanthosoma are X. acutilobum Croat & Delannay, X. alpayacuense Croat & L.P. Hannon, X. alversonii Croat & Delannay, X. amacayacuense Croat & Delannay, X. anderssonii Croat, X. asplundii Croat & Delannay, X. australe Croat & Delannay, X. barbacoasense Croat & Delannay, X. barbourii Croat & Delannay, X. berlinii Croat & Delannay, X. betancurii Croat & Delannay, X. calcaense Croat & Delannay, X. callejasii Croat & Delannay, X. camposii Croat & Delannay, X. caquetense Croat, Delannay & E. Trujillo, X. caucavallense Croat & Delannay, X. ceronii Croat & L.P. Hannon, X. chaparense Croat & Delannay, X. cinchonaense Croat & Delannay, X. crassilaminum Croat & L.P. Hannon, X.crassinervium Croat & L.P. Hannon, X. cundinamarcense Croat & Delannay, X. daulense Croat & Delannay, X. davidsmithii Croat  &  Delannay,  X.  davidsonii  Croat, debelliae  Croat  & Delannay,  X. delannayi Croat, X. diazii Croat & Delannay, X. dodsonii  Croat,  X.  epipetricum  Croat  & Delannay, X. fonnegrae Croat & Delannay, X. foreroi  Croat & Delannay, X. fuentesii Croat & Delannay, X. galianoi Croat & Delannay, X. giraldoi Croat, Delannay & E. Calderón, X. gonzalezii Croat & Delannay X. grayumii Croat & Delannay, X. hannoniae Croat, X. harlingianum (Croat) Croat & L.P. Hannon, X. huilense Croat & Delannay, X. jaramilloi Croat & Delannay, X. jatunsachense Croat, Delannay & C. Cerón, X. jorgeramosii Croat & Delannay, X. killipii Croat & Delannay, X. kressii Croat & Delannay, X. kvistii Croat & Delannay, X. linganii Croat & Delannay, X. lojaense  Croat & Delannay, X. lojtnantii Croat & Delannay, X. longepedunculum Croat & Delannay, X. luteynii Croat & Delannay; X. macarenense Croat & Delannay, X. mansellii Croat & Delannay, X. mariquitense Croat & Delannay, X. mashpiense Croat & Delannay, X.  monteagudoi  Croat  &  Delannay,  X. munchiquense Croat & Delannay, X. mutataense Croat & Delannay, X. nambiense Croat & Delannay, X. nangaritzense Croat & Delannay, X. nestorpazii Croat & Delannay, X. nowickii Croat & Delannay, X. nunezii Croat & Delannay, X. ollgaardii  Croat & Delannay, X. oyuelae Croat & Delannay, X. pailaense Croat & Delannay, X. palaciosii Croat & Delannay, X. palenquense Croat & Delannay, X. panguiense Croat & Delannay, X. pennellii Croat  &  Delannay,  X.  petersiae  Croat, Delannay & J. Lingán, X. piquambiense Croat, D. Scherberich & G. Ferry, X. pulcachense Croat & Delannay, X. purpureomaculatum Croat & L.P. Hannon, X. reinae Croat & Delannay, X. renteriae Croat & Delannay, X. reticulatum  (Engl.)  Croat  &  Delannay, Xanthosoma rimbachi K. Krause, X. sandiaense Croat & Delannay, X. sanintiae Croat & Delannay, X. scherberichii Croat & Delannay, X. schunkei Croat, X. silverstonei Croat, X. sizemoreae Croat & Delannay, X. thompsoniae Croat & Delannay, X. tuberquiae Croat & Delannay, X. ucumariense Croat & Delannay, X. vargasii Croat & Delannay, X. villaricense Croat, Delannay & Lingán, X. wurdackii Croat,  Delannay  &  G.S.  Bunting,  X. yarumalense  Croat  &  Delannay  and  X. zamoraense Croat & Delannay. Two species, X. harlingianum (Croat) Croat & L.P. Hannon and X. reticulatum (Engl.) Croat & Delannay are new combinations transferring them from  Syngonium.  In addition,  Xanthosoma rimbachi K. Krause and Syngonium reticulatum Engl. are being removed from synonymy with  X.  daguense  Engl.  and  restored  as separate species. Besides the 92 new species of  Xanthosoma, 30 additional unpublished species  (with  sterile  or  incomplete specimens and therefore not published here as new) are also described. All 154 species found  in  Western  South  America  are described in detail and illustrated, and an identification key is provided.

 

KEYWORDS

Araceae,  Xanthosoma, South America; New species.