Croton adenocalyx Baillon (1864: 344)

Burilli, Nicolas Giovanny, Pereira, Amanda Da Paixão Noronha & Caruzo, Maria Beatriz Rossi, 2025, Synopsis of Croton section Barhamia subsection Barhamia (Euphorbiaceae), Phytotaxa 705 (2), pp. 162-172 : 164

publication ID	https://doi.org/10.11646/phytotaxa.705.2.3
persistent identifier	https://treatment.plazi.org/id/3A6A0146-184B-1A2C-FF7B-FF1F96F2FD4F
treatment provided by	Felipe
scientific name	Croton adenocalyx Baillon (1864: 344)
status

Treatment

1. Croton adenocalyx Baillon (1864: 344) View in CoL .— Oxydectes adenocalyx (Baill.) Kuntze (1891: 610) . Type:— BRAZIL. Piauí: s.dat., G. Gardner 2309 (lectotype designated here, P 00623668!; isolectotypes, A 00277243!, A 00257874!, B† [photo F 5048!], G 00434412!, K 000186111!, K 000186112!, L 0016143!, P 00222700, W 0060082!, W 0067221!).

Croton adenocalyx is a shrub exclusively from the Caatinga domain in northeastern Brazil (Ceará, Pernambuco, Piauí, Rio Grande do Norte, and Sergipe). It is found in well-drained to clayey-rocky soils, between 103 and 811 m elevation.

Notes:— Croton adenocalyx resembles Croton rudolphianus , differing from it by pistillate sepal morphology (sepals ovate-lanceolate with stipitate glands in C. adenocalyx vs. sepals oblong to spatulate without glands in C. rudolphianus ), and style division (tetrafid with 12 stigmatic tips in C. adenocalyx vs. multifid with 14 stigmatic tips in C. rudolphianus ). This species was described based on a collection from P, Gardner 2309. However, two specimens were found in the P herbarium. Therefore, we choose a collection that perfectly fits the morphological description of the species and that is virtually available at P.

Representative specimens:— BRAZIL. Rio Grande do Norte: Luís Gomes, Cachoeira do Relo, 22 April 2015, M. Oliveira 6046 (HRSN 29360, HUEFS 0230518!, RB 01109425!).