<i>Celtis atlantica</i> (Cannabaceae): A new endangered tree species from southwest of Brazil

Zamengo, Henrique Borges; Bastos, Fabio Mostacato; Chamorro, Débora; Gaglioti, André Luiz; Pederneiras, Leandro Cardoso

doi:10.1590/1677-941X-ABB-2023-0227

Brasil

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Original article • Acta Bot. Bras. 38 • 2024 • https://doi.org/10.1590/1677-941X-ABB-2023-0227 linkcopy

Celtis atlantica (Cannabaceae): A new endangered tree species from southwest of Brazil

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Abstract

During the Neotropical review of Celtis, a new species (Celtis atlantica) endemic and endangered to southeastern Brazil was discovered. A morphological description, a distribution map, conservation status, taxonomic notes, illustrations, and an identification key of the Celtis from the Southern Cone and Brazil are provided.

Keywords: Atlantic rainforest; Brachyteles hypoxanthus; Cannabaceae; Celtis; Cerrado; endocarp; Mertensia; Neotropics; taxonomy; and Urticalean

Characteristic	C. atlantica	C. orthacanthos	C. tala
Habit	Tree not climbing	Climbing shrub	Tree not climbing
Leaf (size cm)	6-12.5 × 2-5	4-12.5 × 1.5-5.5	1.7-5 × 0.8-2.5
Leaf (apex)	Acuminate to caudate	Acuminate	Acute to attenuate
Leaf (base)	Attenuate to cuneate	Obtuse, rounded to sub-cordate	Obtuse
Perfect flower (indumentum ovary)	Glabrous to subglabrous	Subglabrous to pilose	Glabrous to subglabrous
Pistilate flower (length of style)	0.6-1 mm	0.6-1 mm	Null
Pistilate flower (stigmatic lobes)	Bifid (1-1.5 mm deep)	Bifid (3-4 mm deep)	Bilobate (0.1-0.5 mm deep)
Drupe (size mm)	10-13 × 5-6.5	11.5-13 × 9.5-10.5	4-7 × 3-5
Pyrene (size mm)	5.5-10 × 5.5-7	7-9 × 5-6	3.5-4 × 3-4
Pyrene (form)	Ovate	Ovate	Globose
Pyrene (apiculum)	Present	Present	Absent
Pyrene (apiculum scar)	Absent	Present	Absent
Pyrene (ornamentation)	Verrucose	Alveolate-crateriform	Verrucose
Distribution areas	Southeast Brazil	Southeast and Northeast Brazil	Southern Bolivia and Brazil, eastern, central and western Argentina, and throughout Uruguay

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Sociedade Botânica do Brasil SCLN 307 - Bloco B - Sala 218 - Ed. Constrol Center Asa Norte CEP: 70746-520 Brasília/DF. - Alta Floresta - MT - Brazil
E-mail: acta@botanica.org.br

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