504 MISC. PUBLICATION 42 3, IT. S. DEPT. OF AGRICULTURE 



7. Leaflets broadly deltoid, usually distinctly and often deeply 3-lobed, 



the lobes often irregularly cleft 7. P. wrightii. 



7. Leaflets lanceolate to triangular-ovate, entire or merely subhastate. 



8. P. ANGUSTISSIMUS. 



1. Phaseolus parvulus Greene, Bot. Gaz. 6: 217. 1881. 



Alepidocalyx parvulus Piper, Contrib. U. S. Natl. Herbarium 

 22: 672. 1926. 



Chiricahua and Huachuca Mountains (Cochise County), Santa 

 Catalina and Rincon Mountains (Pima County), 7,500 to 8,000 feet, 

 rich soil in coniferous forests, August and September. Southwestern 

 New Mexico and southern Arizona. 



2. Phaseolus acutifolius A. Gray, PL Wright. 1: 43. 1852. 



Pinal, Cochise, Santa Cruz, and Pima Counties, 3,000 to 5,000 feet, 

 August and September. Western Texas to southern Arizona and 

 Mexico. 



The broad-leaved form, var. latijolius Freeman, cultivated under 

 the name tepary bean, is believed by Vavilov to have originated in 

 southern Mexico or Central America. It is very drought resistant. 

 The common wild form in Arizona, with much narrower leaflets, is var. 

 tenuifolius Gray (P. tenuifolius Woot. and Standi.). 



3. Phaseolus atropurpureus DC, Prodr. 2: 395. 1825. 



Fresnal Canyon, Baboquivari Mountains (Pima County), 4,000 (?) 

 feet (Gilman B166, Peebles 8802), August and September. Southern 

 Arizona to Central America. 



The Arizona specimens are exceptionally thin -leaved and only 

 moderately sericeous. The long stems clamber over bushes. 



4. Phaseolus heterophyllus Willd., Enum. PL 2: 753. 1809. 



Phaseolus macropoides A. Gray, PL Wright. 2: 33. 1853. 



Greenlee, Cochise, Santa Cruz, and Pima Counties, 5,000 to 6,700 

 feet, fairly common on dry plains and mesas, often with grasses, 

 August to October. Western Texas to Arizona, south to Central 

 America. 



Distinguished from all the other Arizona species by the brick-red 

 color of the fresh flowers. The more or less typical form (P. macropoi- 

 des) has the leaflets oblong to rhombic-ovate and commonly lobed, 

 and the pods usually short-pilose. In var. rotundifolius (A. Gray) 

 Piper (P. rotundifolius A. Gray), which has about the same distribu- 

 tion in Arizona as the other form, the leaflets are nearly orbicular and 

 mostly entire, and the pods are commonly villous. The type of P. 

 rotundifolius was collected west of the Chiricahua Mountains, Cochise 

 County (Wright 954). 



5. Phaseolus ritensis M. E. Jones, Contrib. West. Bot. 12: 14. 1908. 

 White Mountains (Apache County), mountains of Cochise, Santa 



Cruz, and Pima Counties, 4,500 to 6,000 feet, common among live 

 oaks and at the lower limit of the pine belt, July to September, type 

 from the Santa Rita Mountains (Jones in 1903). Southern Arizona 

 and Mexico. 



