<i>DE MACROCARPAEAE GRISEBACH (EX GENTIANACEIS) SPECIEBUS NOVIS </i> VI: SEED MORPHOLOGY, PALYNOLOGY, AN INFRAGENERIC CLASSIFICATION , AND ANOTHER TWENTY-THREE NEW SPECIES LARGELY FROM COLOMBIA

A brief survey of seed morphology and palynology in <i>Macrocarpaea</i> is discussed and illustrated by Scanning Electron Microscopy (SEM) photographs. An infrageneric classification is presented where four sections are recognized: sect. <i>Tabacifoliae</i>, sect. <i>Macrocarpaea</i>, sect. <i>Magnolifoliae</i>, and sect. <i>Choriophylla</i>. Another 23 new species, largely from Colombia, are here described and illustrated: Brazil (1): <i>M. illecebrosa</i>; Colombia (14): <i>M. betancuriana</i>, <i>M. callejasii</i>, <i>M. gaudialis</i>, <i>M. gondoloides</i>, <i>M. gravabilis</i>, <i>M. gulosa</i>, <i>M. hilarula</i>, <i>M. jocularis</i>, <i>M. lacrossiformis</i>, <i>M. laudabilis</i>, <i>M. maryae</i>, <i>M. silverstonei</i>, <i>M. umerulus</i>, and <i>M. ypsilocaule</i>; Ecuador (4): <i>M. berryi</i>, <i>M. jactans</i>, <i>M. neillii</i>, and <i>M. voluptuosa</i>; and Peru (4): <i>M. chthonotropa</i>, <i>M. granpajatena</i>, <i>M. quechua</i>, and <i>M. xerantifulva</i>.