FLOWERING PLANTS AND FERNS OF ARIZONA 447 



10. Stems, leaves, and pods strigose or sericeous (11). 



11. Pubescence silvery; pods 4 to 5 mm. wide, 15 to 25 mm. long; 

 stems decumbent or nearly prostrate; leaflets obovate or 

 oblanceolate, obtuse, sometimes emarginate, not more and 

 usually less than 15 mm. long, 3 to 6 mm. wide; calyx teeth 

 commonly shorter than the tube; corolla 12 to 18 mm. long. 



11. L. MEABNSII. 

 11. Pubescence not silvery: pods not more and usually less than 4 

 mm. wide, 20 to 40 mm. long (12). 

 12. Stems erect or nearly so; leaflets of all but the lowest leaves 

 linear, acute, 15 to 30 mm. long, seldom more than 2 mm. 

 wide; calyx teeth subulate-setaceous, equaling or (com- 

 monly) somewhat longer than the tube, conspicuously 

 villous; corolla up to 18 mm. long; pods 2 to 3 mm. wide. 



12. L. OROBOIDES. 



12. Stems spreading, decumbent, or nearly prostrate; leaflets 

 oblanceolate to broadly obovate, commonly obtuse or 

 truncate at apex, not more than 20 mm. long, seldom less 

 than 3 mm. wide; calyx teeth lanceolate, not longer and 

 usually shorter than the tube, pubescent with appressed 

 or subappressed hairs; corolla not more than 15 mm. long 

 (13). 

 13. Leaflets seldom more than 4, oblanceolate, up to 20 (com- 

 monly about 10) mm. long; pods 3 to 4 mm. wide. 



13. L. LOXGEBRACTEATUS. 



13. Leaflets commonly 5 or 6, broadly oblanceolate to broadly 

 obovate, seldom more than 10 and often less than 5 mm. 

 long; pods 2 mm. wide 14. L. xeomexicanus. 



1. Lotus oblongifolius (Benth.) Greene, Pittonia 2: 146. 1890. 



Hosackia oblongifolia Benth., PL Hartw. 305. 1848. 



Huachuea Mountains, Cochise County {Lemmon 2670). 



The presence of this California species of the section Hosackia in 

 southeastern Arizona is remarkable, and an error in the locality as 

 stated on the labels of Lemmon's specimens would be suspected were 

 it not that a very similar specimen collected near Colonia Garcia, 

 Chihuahua (Tovmsend and Barber 159), was identified by Greene as 

 L. torreyi Greene (L. oblongifolius var. torreyi Ottley), the form to 

 which Lemmon's specimens also are referrable. 



2. Lotus alamosanus Rose, Contrib. U. S. Xatl. Herbarium 1: 96. 



1891. 

 Sycamore Canyon near Ruby, Santa Cruz County {Goodding 1830), 

 about 4.000 feet, " abundant," April and May. Southern Arizona, 

 Sonora, and Durango. 



3. Lotus purshianus (Benth.) Clements and Clements, Rocky Mount. 



Fl. 183. 1914. 



Hosackia purshiana Benth., Edwards's Bot. Reg. 15: pi. 1257. 



1829. 

 Lotus americanus (Xutt.) Bisch., Del. Sem. Hort. Heidelb. 



1839; Linnaea 14: Litt. 132. 1840. Not of Vellozo. 

 Acmispon americanum Rydb., Torrey Bot. Club Bui. 40: 45. 



1913. 



Apache, Yavapai, Gila, and Cochise Counties, 5,000 to 7,500 feet. 

 open pine forests, July to October. Minnesota to Washington, New 

 Mexico, Arizona, and California. 



Spanish-clover. 



290744°— 42 29 



