Chromosome Numbers in Perityle and Related Genera (Peritylanae‐compositae)

Chromosome numbers are presented for 28 species of the genus Perityle , one putative inter‐sectional hybrid, two species of Amauria , one species of Eutetras , and one species of Pericome . For Perityle , initial counts are recorded for 12 species of sect. Laphamia ( n = 16, 17, 18, 36, ca. 102) and 11 species of sect. Perityle ( n = 11, 12, 13, 16, 17, 18, 19, 34, 51). Chromosome numbers for the two species of Amauria ( n = 18) are first reports for the genus. Including the current information, chromosome numbers have been recorded for 37 of the approximately 50 species recognized for Perityle . At least 24 taxa have numbers of n = 17, suggesting a base chromosome number of x = 17 for Perityle .