A hybrid swarm in Cassia

Abstract

Cassia specimens collected from a transect on a hillside near Alice Springs, central Australia, showed many intermediate characters, the distribution of which were very suggestive of a hybrid swarm between C. desolata F. Muell. var. involucrata J. M. Black and C. artemisioides Gaud. The specimens were examined for seven characters, and the results are presented.

A cline up the hill in leaflet numbers in the species C. artemisioides is recorded.