AGAVES OF THE UMTED STATES. 73 
18. — Very abundant on the mountains of Soutln>rn Arizona, 
from the Santa Catalina to the Chuiu ah us at an elevation 
of about 5,000 feet. — Plate 29. 
Specimens examined: — Dr. A. Schott's original speci- 
mens from Sierra del pajarito, VII., 1855; No. 1433 of 
Emory's Expedition, 1873; J. G. Lemraon and wife, 
April and Mav, 1880 and 1881 ; C. G. Prinde, Southern 
Mountains, 1881; Eincon Mountains, June, 1884; Santa 
Catalina Mountains, 1882; J. W. Toumej, Santa Catalina 
and Rincon Mountains, 1894. 
Var. SERRULATA. — Of distinctly smaller habit: leaves 
narrower and shorter ; leaf bases narrower, serrulate and 
slightly undulate; end-spine shorter; intiorescence more 
compact ; perianth apparently broader at base ; lobes very 
short and broad; anthers much smaller; filaments inserted 
at a greater distance below segments, longer; lobes of 
stigma fringed; capsules smaller, thinner, more persist- 
ent. — Collected in the Eincon Mountains, July, 1894, by 
Professor J. W. Tourney, of the Universitj"^ of Arizona, 
who states that he finds it to occur further south than the 
typical form. — Plate 29. 
A specimen of A. Schottii collected by Mr. Pringle on 
*' dry, rocky slopes of Southern Mountains," 1880, has cap- 
sules with much elongated beaks. Another specimen of Mr. 
Pringle's from the Eincon Mountains, June 19th, 1884, has 
groups of three and four flowers in the axils of the bracts. 
Professor Tourmey writes that this species so thickly 
covers large areas miles in extent on the southern slope of 
the Santa Catalina Mountains that it is almost impossible 
to travel over it. The variety is not found in this locality. 
This plant is the amole of Arizona, and is sold by Mexicans 
and Indians in the streets of Tucson (Professor Tourney). 
A. PAEViFLOiiA Torrey. — Plants very small, forming 
low rosettes: leaves thick, 5 to 10 cm. long, 1 cm. wide. 
