Monographs Details: Parkinsonia texana var. macra (I.M.Johnst.) Isley
Authority: Isley, Duane. 1975. Leguminosae of the United States: II. Subfamily Caesalpinioideae. Mem. New York Bot. Gard. 25 (2): 1-228.
Description:Distribution and Ecology - Range as key. Valley scrub, usually with Prosopis, Opuntia, Parkinsonia aculeata, roadsides and fence rows, sandy loam to clay soil, locally common and conspicuous. March-April(-May).
Discussion:Cercidium macrum Johnst. (1924)
CN n = 14 (Turner and Fearing, 1960; as Cercidium macrum).
Turner (1959) and Correll & Johnston (1970) both attribute 2-3 pairs pinnae to var. macra and only 1 to var. texana. Probably they refer to leaflet number in which the two indeed usually differ; the pinnae, however, are l(-2) in both.