Barleria L

Daniel, Thomas F., 2018, Chromosome Numbers of Some Cultivated Acanthaceae with Notes on Chromosomal Evolution in the Family, Proceedings of the California Academy of Sciences 64 (9), pp. 319-332 : 321

Barleria L .

— Barleria consists of about 270 species concentrated in Africa, but with native occurrences in Asia and the New World. The approximate count of n = 20 or 21 is the first for B. obtusa Nees , a species native to southern Africa. Although a diversity of numbers has been reported for 18 species, counts of n = 20 have been reported for 16 of them. Counts of n = 21 have been reported for two species, B. cristata L. and B. strigosa Willd. ( De 1966); however, all or most other counts for these two species are n = 20. If accurate, counts of n = 21 for these species probably represent dysploidy within the species. As noted by Daniel and Chuang (1998), x = 20 would appear to be the likely ancestral basic number for this genus.