Esenbeckia cornuta

Esenbeckia cornuta Engl., Flora Brasiliensis 12(2): 146 (1874). Type Protologue: Peruvia pr. Jaen. de Bracamoros, Warscewicz. Type: Peru, Warszewicz s.n. (holotype, B destroyed, photograph at F! negative no. 12512, https://fm-digital-assets.fieldmusum.org/30/341/14317.jpg; lectotype, designated by Kaastra 1982: 79, K 531234! [Herb. Benthamianum], isolectotypes, NY 51856!, KRA 533031-533048! [17 sheets]).

Remarks.

Esenbeckia Kunth is represented by ca. 40 species of shrubs or trees, distributed in America: from Mexico to north-eastern Argentina, and in the West Indies (Kaastra 1982; Wilkerson and Fairchild 1983; The Plant List 2021). One of the rarest species in this genus is Esenbeckia cornuta, which to date is known from the type locality in Peru, and the two sheets with specimens of that taxon preserved respectively at K (http://apps.kew.org/herbcat/getImage.do?imageBarcode=K000531234) and NY (http://sweetgum.nybg.org/science/vh/specimen-details/?irn=721187; Kaastra 1982). In the herbarium of KRA, there are, however, an additional 17 sheets with original specimens of that taxon (isolectotypes). The specimens preserved in KRA constitute together with the lectotype, one of Warszewicz’s gatherings, collected in the same manner and in the same period of time in terms of phenology, development and flowering.