FLAT ROCK QUILLWORT, ISOETES GRANITICOLA, A NEW LYCOPHYTE FROM THE SOUTHEASTERN UNITED STATES

摘要

The Flat Rock Quillwort, Isoetes graniticola sp. nov., occurs in ephemeral pools on several granite outcrops in Randolph and Lee counties of east-central Alabama, and possibly Heard County of western Georgia. It is tetraploid (2n=44), in contrast to the widespread Piedmont outcrop diploid (2n=22) I. piedmontana (s. str.), with which it is close in appearance. Presently known from three (possibly five) populations, I. graniticola represents a globally rare endemic of the western Piedmont.