Cytotaxonomic Studies in the Tribe Quillajeae (Rosaceae)

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Abstract
The following chromosome numbers were found in previously uncounted genera of Quillajeae: n = 17 in Lindleya and Kageneckia and n = 15 in Vauquelinia. An earlier count of n = 27 in Lyonothamnus is confirmed, but Quillaja, previously reported as n = 17 has n = 14 in both species currently recognized. This variety of chromosome numbers supports the widely held contention that the tribe is unnatural. Lindleya is regarded as a member of the Maloideae, where x = 17 is basic, and Vauquelinia is suggested as best placed in this subfamily. The genus Exochorda, with n = 8, appears to accord with Prunoidea (x = 8), particularly with Oemleria, while Lyonothamnus seems best left in Spiraeoideae (x = 9). The peculiarities of the remaining genera, Kageneckia and Quillaja, suggest that they be placed in a separate subfamily.

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