FLOWERING PLANTS AND FERNS OF ARIZONA 495 



11. Segments of the fruit not more than 4 mm. long, sparsely pubescent 



or glabrous; leaflets oblong-lanceolate, not conspicuously reticu- 

 late, the terminal one seldom less than 3 times as long as wide; 



bracts ovate, closely imbricate 11. D. batocaulon. 



10. Stems erect or ascending; leaves lighter green but not glaucous be- 

 neath (12). 



12. Bracts conspicuous before anthesis, imbricate, lanceolate or ovate- 



lanceolate, 4 to 7 mm. long; leaves nearly sessile, the terminal 

 leaflet lanceolate, 5 or more times as long as wide; fruit subsessile 



or very short-stipitate 12. D. arjzonicum. 



12. Bracts not conspicuous or noticeably imbricate, subulate or narrowly 

 lanceolate; lower leaves with petioles 1.5 cm. long or longer; 

 fruit rather long-stipitate (13). 

 13. Leaflets obtuse, the terminal one 2 to 3 times as long as wide, 

 oblong, ovate, or obovate; hairs of the fruit not uncinate. 



13. D. CINERASCENS. 



13. Leaflets acute or acutish, the terminal one up to 5 times as long 

 as wide, oblong-lanceolate; hairs of the fruit uncinate. 



14. D. METCALFEI. 



1. Desmodium angustifolium (H. B. K.) DC, Prodr. 2: 328. 1825. 



Hedysarum angustijolium H. B. K., Nov. Gen. et Sp. 6: 404. 



1823. 

 Meibomia angustifolia Kuntze, Rev. Gen. PI. 1: 197. 1891. 



Southwestern Cochise County, Patagonia Mountains and Sycamore 

 Canyon near Ruby (Santa Cruz County), Santa Catalina and Babo- 

 quivari Mountains (Pima County), 3,500 to 5,000 feet, dry rocky 

 slopes with live oaks and grasses, September. Southern Arizona to 

 northern South America. 



The Arizona form is var. gramineum (Gray) Schubert (D. gramineum 

 Gray), the type of which was collected "on the Sonoita," probably 

 in southwestern Cochise County (Wright 1009), and which is limited 

 to southern Arizona and northern Mexico. D. angustifolium is easily 

 distinguished from all Arizona's other species of Desmodium by the 

 somewhat woody steins and long narrow grasslike unifoliolate leaves. 



2. Desmodium wrightii A. Gray, Bost. Jour. Nat. Hist. 6: 177. 1850. 



Meibomia wrightii Kuntze, Rev. Gen. PI. 1: 198. 1891. 



Sycamore Canyon near Ruby (Santa Cruz County) , Santa Catalina 

 and Baboquivari Mountains (Pima County), about 3,500 feet, August 

 and September. Texas and southern Arizona, doubtless also in north- 

 ern Mexico. 



3. Desmodium intortum (Mill.) Urban, Symb. Ant, 8: 292. 1920. 



Hedysarum intortum Mill., Gard. Diet. ed. 8, No. 11. 1768. 

 Desmodium sonorae A. Gray, PI. Wright. 2: 47. 1853. 

 Meibomia uncinata (Jacq.) Kuntze, Rev. Gen. PI. 1: 197. 1891. 



The type of D. sonorae was collected "on the Sonoita," probably in 

 what is now Cochise County (Wright 1014). The species apparently 

 has not been collected since in Arizona, It is widely distributed in 

 tropical America. 



4. Desmodium retinens Schlecht,, Linnaea 12: 311. 1838. 



Meibomia retinens Kuntze, Rev. Gen. PL 1: 198. 1891. 



A specimen from the Chiricahua Mountains, Cochise County 

 (Blumer 1188), was identified by A. K. Schindler as of this species. 



286744°— 42 32 



