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Introgression in Central American Phytolacca (Phytolaccaceae)

Jerrold I. Davis
American Journal of Botany
Vol. 72, No. 12 (Dec., 1985), pp. 1944-1953
Stable URL: http://www.jstor.org/stable/2443611
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Introgression in Central American Phytolacca (Phytolaccaceae)
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Abstract

A numerical analysis of morphological variation in Central American Phytolacca distinguishes P rivinoides Kunth & Bouché from the P iscosandra complex, which includes elements that have been recognized as P. icosandra L., P octranda L., P. purpurascens A. Br. & Bouché, P. rugosa A. Br. & Bouché, and P eostaricensis Suesseng. A third and rarely collected taxon, P. meziana H. WAR., is also distinguished. New chromosome counts of 2n = 36 are recorded for P rivinoides and two representatives of the P. icosandra complex. Nearly half the morphological variation in the sample is summarized by a multivariate axis that separates P. rivinoides from the P. icosandra complex. This axis correlates with a cline in elevation; P rivinoides occurs between sea level and 2,200 m, and P. rugosa occurs between 1,000 and 3,400 m. It is hypothesized that introgression of the P rivinoides genome into that of P. rugosa has generated the P. icosandra complex; elements of this complex then migrated northward through Mexico and may have been progenitors of the North American P americana L.

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