416 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



3. Acacia lemmoni Rose, Contrib. U. S. Natl. Herbarium 12: 409. 



1909. 



Acaciella lemmoni Britt. and Rose, North Amer. Fl. 23: 103. 

 1928. 



Huachuca Mountains, Cochise County (Lemmon in 1882, the type 

 collection, Hilend 758), about 6,000 feet. Known only from south- 

 eastern Arizona. 



4. Acacia hirta Nutt. ex Torr. and Gray, Fl. North Amer. 1: 404. 



1840. 



Acaciella hirta Britt. and Rose, North Amer. Fl. 23: 102. 1928. 



Gila County to Cochise, Santa Cruz, and Pima Counties, 3,000 to 

 6,500 feet, dry rocky slopes, usually in chaparral, May to September. 

 Missouri to Texas, Arizona, and northern Mexico. 



A very handsome plant, with feathery foliage and panicled round 

 heads of cream-colored flowers, easily cultivated. The habit of growth 

 is well adapted to protecting soil against erosion. The stems reach a 

 height of about 1.5 m. Two varieties occur in Arizona: (1) var. 

 suffrutescens (Rose) Kearney and Peebles (Acacia suffrutescens Rose), 

 with lateral veins of the leaflets obsolete or obscure and leaflets seldom 

 more than 1.5 mm. wide; (2) var. shrevei (Britt. and Rose) Kearney 

 and Peebles (Acaciella shrevei Britt. and Rose), with several distinct 

 lateral veins and broader leaflets, these up to 2.5 mm. wide. The sec- 

 ond variety approaches A. lemmoni. The intergradation between 

 these varieties, and between var. suffrutescens and typical A. hirta is 

 complete. The type of A. suffrutescens was collected near Tucson 

 (Pringle in 1881), and that of A. shrevei in the Huachuca Mountains 

 (Shreve 5064). There is much variation in pubescence of the stems 

 from glabrate to hirsute, in the number and length of the pinnae, 

 and in the number of leaflets, but, except as stated above, no definite 

 segregation has been found practicable by the writers. A form occur- 

 ring in the Baboquivari Mountains (Jones 25024, Goodding 4321) with 

 extraordinarily broad pods, 12 to 15 mm. wide, broad and rounded at 

 the apex, may belong to a different species. 



5. Acacia farnesiana (L.) Willd., Sp. PL 4: 1083. 1806. 



Mimosa farnesiana L., Sp. PL 521. 1753. 

 Vachellia farnesiana Wight and Arm, Prodr. FL Ind. Or. 272. 

 1834. 



Canyons on the west slope of the Baboquivari Mountains (Pima 

 County), reported as occurring also near Ruby (Santa Cruz County), 

 about 4,000 feet, April to November. Florida to southern California, 

 southward to Argentina. 



Sweet acacia, huisache. Extensively cultivated as an ornamental, 

 because of the exquisite fragrance of the flowers, which are used in 

 France in the manufacture of perfumery. In Arizona, a small tree 

 up to 6 m. (20 feet) high, rare. 



6. Acacia constricta Benth. in A. Gray, PL Wright. 1: 66. 1852. 



Acaciopsis constricta Britt. and Rose, North Amer. FL 23: 96. 



1928. 



Greenlee, Gila, and Yavapai Counties to Cochise, Pima, and Yuma 

 Counties, 2,500 to 5,000 feet, shallow "caliche" soil on dry slopes and 



