Monographs Details: Acacia angustissima var. suffrutescens (Isely) Rose
Authority: Isley, Duane. 1973. Leguminosae of the United States: I. Subfamily. Mimosoideae. Mem. New York Bot. Gard. 25 (1): 1-152.
Discussion:Acaciella suffrutescens (Rose) Britt. & Rose Acacia hirta var. suffrutescens (Rose) Kearney & Peebles Acacia hirta subsp. suffrutescens (Rose) Wiggins A. angustissima var. hirta auct. pro parte A. cuspidata auct. pro parte
S to c Arizona. Open dry slopes, ledges, washes, canyons; desert grassland chaparral. 2400-6200(-7000) ft. (May)July-Sept.
Here is a relatively common plant, usually flowering summer-fall, and most conspicuous in years favored with late summer rainfall. Although it is widely separated from var. hirta by the broad belt of texensis, authors have persisted in referring Arizona populations in part to hirta. Var. suffrutescens is distinguished from the former particularly by the inflorescence, the heads usually being terminally aggregated in fascicled (2-3 heads per node) racemes which exceed the leaves. The two varieties are geographically and ecologically disjunct.