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Chromosome numbers in Brazilian cerrado plants

Eliana Regina Forni-Martins^I; Cecília Alzira Ferreira Pinto-Maglio^II; Neusa Diniz da Cruz^II+

^IDepartamento de Botânica, IB, UNICAMP, Caixa Postal 6109, 13081-970 Campinas, SP, Brasil. Send correspondence to E.R.F.-M.
^IISeção de Citologia, Instituto Agronômico, Caixa Postal 28, 13020-902 Campinas, SP, Brasil
⁺Deceased

ABSTRACT

Chromosome numbers are presented for 20 Brazilian species of cerrado vegetation, belonging to 12 families: Annonaceae (Xylopia aromatica, 2n=16), Bombacaceae (Eriotheca gracilipes, 2n=92; E. pubescens, 2n=ca.270), Caryocaraceae (Caryocar brasillense, 2n=46), Cochlospermaceae (Cochlospermum regium, 2n=36), Erythroxylaceae (Erythroxylum campestre, 2n=24), Leguminosae (Acosmium subelegans, 2n=18; Andira humilis, 2n=22; Hymenaea stigonocarpa, 2n=24), Malpighiaceae (Banisteriopsis sp, 2n=40; Byrsonima coccolobifolia, 2n=24; B. intermedia, 2n=24; B. verbascifolia, 2n=24; Peixotoa sp, 2n=30), Myrtaceae (Compomanesia pubescens, 211=22), Rubiaceae (Alibertia sessilis, 2n=22), Sapindaceae (Magonia pubescens, 2n=30; Serjania erecta, 2n=24), Solanaceae (Solanum lycocarpum, 2n=24) and Styracaceae (Styrax ferrugineus, 2n=16). The counts are new for 12 species and four genera. Evolutionary trends are discussed for some species, including the hexaploid origin of E. pubescens from E. gracilipes.

Keywords: chromosome numbers; Brazilian cerrado; plants.

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