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Abstract Detail


Systematics Section / ASPT

Mcneal, Dale [1].

Hybridization in the Themidaceae inferred from somatic chromosome numbers.

IN a small vernal pool complex in Calaveras Co. CA, I collected four species of Brodiaea, B. elegans ssp. elegans Hoover (2N=12, 16, 24, 32, 40, 42, 48), B. coronaria (Salisb) Engl. ssp. coronaria (2N=12,24), B. nana Hoover (2N=12, 16, 24, 48), and B. appendiculata Hoover (2N=12). In addition specimens appearing intermediate to B. elegans and B. coronaria were collected. These latter specimens proved to have a chromosome number of 2N=22, a number otherwise unknown in the genus. I infer on morphologic grounds that these specimens represent F1 hybrids between 2N=12 B. coronaria and 2N=32 B. elegans. A population of Triteleia ixioides (S. Watson) E. Greene from the Central Sierra Nevada, CA revealed a mixture of three chromosomal races, 2N=14, 15, 16. T. ixioides has two supposedly distinct ssp. in this area, ssp. anilina (E. Greene) L. Lenz (2N=10, 14, 40,42, 50) and ssp. scabra (E. Greene) L. Lenz (2N= 10, 12, 16). I conclude from the chromosomal data that the 2N=15 specimens represent hybridization between 2N=14 ssp anilina and 2N=16 ssp scabra, if, indeed, the ssp. warrant recognition. Photomicrographs of all pertinent chromosomal races are presented and discussed.


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1 - University of The Pacific, Department of Biological Sciences, 3601 Pacific Avenue, Stockton, California, 95211-0197, USA

Keywords:
Themidaceae
Brodiaea
hybridization.

Presentation Type: Poster:Posters for Sections
Session: 48-150
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM
Abstract ID:589


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