Croton tafelbergicus Croizat (1948: 401) Croton guianensis Synopsis of Croton section Barhamia subsection Barhamia (Euphorbiaceae) Burilli, Nicolas Giovanny Pereira, Amanda Da Paixão Noronha Caruzo, Maria Beatriz Rossi Phytotaxa 2025 2025-06-13 705 2 162 172 ZQ6Z Aublet (1775: 882) Aublet 882 1775 [162,590,1922,1949] Magnoliopsida Euphorbiaceae Croton Plantae Malpighiales 3 165 Tracheophyta species guianensis      Croton tafelbergicus  Croizat (1948: 401). Type:— SURINAME. Sipaliwini: Tafelberg, south of East Ridge,  900 maltitude,  1 September 1944,  B. Maguire24582( holotype, A 00047445!; isotypes, K 000254412!, NY 00262963!, U 0145910!, US 00109771!).   Croton guianensisis a shrubby to arborescent species, found in Brazil( Roraima, Amapá), French Guyana, Guyana, Suriname, and Venezuela. It occurs from 80 to 710 melevation in the Amazon domain, typically on sandstone and moist soil.   Notes:—In accordance with Article 9.12 of International Code of Nomenclature (Turland et al.2018), the designation of a lectotypeis required. We have selected the specimen BM 015177111, as it is the one that most accurately represents the species morphologically and given that it is housed in the herbarium where Aublet’s original collection is deposited. This specimen was used for both original species description and its illustration. Although section  Barhamiais characterized by the absence of glands at the acropetiolar region ( van Ee et al.2011),  Croton guianensishas stipitate glands at the base of the leaves, a feature clearly visible in the original illustration and cited in the protologue of the species. Due to the presence of this characteristic, we could have chosen to exclude the species from the group. However, one of the phylogenetic studies with molecular data carried out with the genus  Crotonhas sampled a specimen of  C. guianensis, Berry5535(MICH 1544158, MO 1370537; accession numbers AY971215, AY971303, respectively), and the species emerged among others from section  Barhamia( Berry et al.2005). Furthermore, the species share morphological characteristics with members of the section  Barhamia( e. g. stellate indumentum, serrate margins, pinnate venation, glandular stipules, terminal and bisexual inflorescences, sepals of pistillate flowers glandular, and tetrafid styles). Therefore, we decide provisionally to maintain this species in the section until further studies are carried out on the systematics and evolutionary history of the group.   Representative specimens:— GUYANA. Dadanawa: Rupununi, 2º49’N, 59º 31’W, 6 June 1995, M.J. Jansen- Jacobs, B.J.H. ter Welle, C. Gustafsson & V.James 3947(K 004622729!, MBM223992!, MO 1370533!, NY 03979189!, US00602113!). [341,534,159,181] 1944-09-01 B. Maguire Suriname Type 900 East Ridge Tafelberg 4 166 2 Sipaliwini holotype