Journal article

Publication year: 1992

Pages: 143-169

Journal: Plant Systematics and Evolution

Volume number: 181

Issue number: 3-4

ISSN: 0378-2697

eISSN: 1615-6110

DOI Link: https://doi.org/10.1007/BF00937441

Publisher: Springer

Abstract: 
The variation pattern of a large population of Tocoyena formosa in Botucatu, state of Sao Paulo, Brazil, and of other samples throughout the species area was analysed by morphometrical, statistical, ecological, and phytogeographical methods. Excessive variation and the remarkable coherence of two different character syndromes within this species strongly suggest that it has originated as a homogamic (diploid) hybrid complex. Possible parental species are T. brasiliensis, mainly from the Amazon region, and T. viscidula from the dry caatinga region of NE. Brazil. T. formosa has a much more extensive geographical range and greater ecological plasticity, ranging from the Amazon basin and the Guyanas throughout the Central Brazilian Plateau and from NE. to S. Brazil and Paraguay. Three (partly sympatric) varieties are distinguished within T. formosa, i.e. var. formosa, var. pseudobrasiliensis (var. nov.), and var. microdon (comb. et stat. nov.). A provisional taxonomic revision, key, and conspectus covers the 12 accepted species of Tocoyena with blunt flower buds and ovate obtuse corolla lobes (group A, including T. formosa); their distribution is shown in a map.

Harvard Citation style: SILBERBAUERGOTTSBERGER, I., GOTTSBERGER, G. and EHRENDORFER, F. (1992) HYBRID SPECIATION AND RADIATION IN THE NEOTROPICAL WOODY GENUS TOCOYENA (RUBIACEAE), Plant Systematics and Evolution, 181(3-4), pp. 143-169. https://doi.org/10.1007/BF00937441

APA Citation style: SILBERBAUERGOTTSBERGER, I., GOTTSBERGER, G., & EHRENDORFER, F. (1992). HYBRID SPECIATION AND RADIATION IN THE NEOTROPICAL WOODY GENUS TOCOYENA (RUBIACEAE). Plant Systematics and Evolution. 181(3-4), 143-169. https://doi.org/10.1007/BF00937441