Monographs Details: Calliandra humilis Benth. var. humilis
Authority: Isley, Duane. 1973. Leguminosae of the United States: I. Subfamily. Mimosoideae. Mem. New York Bot. Gard. 25 (1): 1-152.
Description:Distribution and Ecology - W Texas to n Arizona. Texas: open rocky, igneous and limestone soils; Arizona: grassy slopes, oak woodland, pinyon-juniper or yellow pine. 3000-8000 ft. June-July (Aug.). N Mexico.
Discussion:Calliandra humilis Benth.
C. herbacea Engl.
Anneslia herbacea (Engl.) Britt. & Rose
Summarizing previous discourse (Isely, 1972): The Texas and Arizona forms are disjunct (ring apparently closed in adjacent Mexico), but there is no significant morphological differentiation except that Texas populations include glabrate as well as pubescent forms. Turner (1959) and subsequently Correll and Johnston (1970) segregate C. humilis and C. herbacea on basis of correlation of pubescence, pinnae number and peduncle length, reasonable in Texas but unsatisfactory in Arizona.
Distribution:United States of America North America