Two leguminous forest trees new to the flora of French Guiana

Stryphnodendron moricolor (Mimosaceae) is described, illustrated and discussed. The genusMonopteryx (Fabaceae) is reported for the first time outside Amazonian Brazil and adjacent Venezuela. A key distinguishing the three known species ofMonopteryx is presented.     

A contribution to the taxonomy of Piptadenia (Mimosaceae) in South America

Four new species ofPiptadenia are described:P. anolidurus (from Amazonian Ecuador, Peru and Brazil),P. buchtienii (from trans-Andean Bolivia),P. cuzcoënsis (from southern Peru), andP. imatacae (from Venezuelan Guayana); andP. adiantoides var.peruviana J. F. Macbr. is raised in rank toP. peruviana. In relation toP. imatacae the transfer ofP. uaupensis Benth. andP. floribunda Kleinhoonte toAdenopodia Presl is shown to be ill-advised. The affinities of each new species are discussed and critical characters are illustrated.Mimosa tessmanii Harms is newly synonymized withP. uaupensis.

     

Orphanodendron,a new genus of caesalpinioid Leguminosae from northwestern Colombia

A taxonomically isolated new genus is described to accommodateOrphanodendron bernalii Barneby & Grimes, sp. nov., from western Antioquia, Colombia. Discussion and illustration display an anomalous syndrome of morphological characters that equivocally suggests affinity to Caesalpinioideae tribe Sclerolobieae Bentham (=Caesalpinieae sensu Polhill & Vidal).     

Two taxonomic equations relevant to the Flora of Saül,French Guiana

The taxonomic equationsMelanoxylon speciosum Benoist=Recordoxylon amazonicum (Ducke) Ducke andElephantomene eburnea Barneby & Krukoff (1974)=Cionomene javariensis Krukoff (1979) are proposed. The new combinationRecordoxylon speciosum (Benoist) Gazel is validated, and the widely discontinuous distribution of the monotypic genusElephantomene is mapped.     

Two new Brazilian species of Chamaecrista Moench (Leguminosae: Caesalpinioideae)

Chamaecrista (sect.Apoucouita) onusta Irwin & Barneby from coastal Bahia andCh. (sect.Absus) hatschbachii Irwin & Barneby from north-central Minas Gerais are described, figured and systematically characterized. Four new combinations inChamaecrista incidental to the discussion are proposed.     

Two new species of Disciphania (Menispermaceae: Tinosporeae) from subandean Ecuador and Peru

Described, figured, and discussed are the new speciesDisciphania dioscoreoides Barneby from Amazonian Ecuador and Peru, andD. tricaudata Barneby, sympatric with it in Ecuador. Both are referred toDisciphania sect.Taubertia (K. Schumann) Barneby.     

Two new taxa in dalea (Fabaceae: Amorpheae) from southern Mexico and Northern Chile

Dalea acracarpica, from Chiapas, Mexico is described, illustrated, and referred to sect. Parosela ser. Lasiostomae: the var. chilensis is a yellow-flowered Chilean counterpart of purple Peruvian D. pennellii var. pennellii.