Taxonomy, geographical distribution and reproductive biology of Calliandra calothyrsus (Leguminosae, Mimosoideae), a species with agroforestry potential.
Calliandra calothyrsus is a multipurpose shrub with great agroforestry potential. Its affinities seem to be with a poorly understood taxonomic complex, occurring in a portion of the Pacific slope in Mexico. Natural populations of C. calothyrsus occur at low and middle altitudes, ranging from southeastern Mexico to Panama. Floral and pollen characters, nectar production and sex expression are described, and evidence that the flowers are pollinated by sphingids and bats is presented. Some of the populations occur sympatrically with C. houstoniana, and evidence that these two species hybridize is discussed.