FLOWERING PLANTS AXD FERNS OF ARIZONA 451 



*2. Psoralea megalantha Woot. and Standi., Contrib. U. S. Natl. 



Herbarium 16: 140. 1913. 



Pediomelum megalanthum Rydb., North Amer. Fl. 24 : 22. 1919. 



Not known to occur in Arizona but has been collected near the bor- 

 ders in New Mexico and Utah. 



3o Psoralea mephitica S. Wats., Amer. Acad. Arts and Sci. Proc. 14: 

 291. 1879. 



Pediomelum mephiticum Rydb., North Amer. Fl. 24: 22. 1919. 



Apache County to Mohave County, 4,000 to 5,500 feet, also in 

 western Gila County (A Nelson 1795), April to June. Southern 

 Utah and Arizona. 



The type of var. retrorsa (Rydb.) Kearney and Peebles (Pediomelum 

 retrorsum Rydb.) was collected at Peach Springs, Mohave County 

 (Lemmon in 1884). The variety differs from the typical form in its 

 larger leaflets (up to 4 cm. long), longer peduncles and inflorescences, 

 and larger corolla. 



4. Psoralea lanceolata Pursh, Fl. Amer. Sept. 475. 1814. 



Psoralea micrantha A. Gray, U. S. Rpt. Expl. Miss. Pacif. 4: 



77. 1857. 

 Psoralidium lanceolatum Rydb., North Amer. FL 24: 13. 1919. 

 Psoralidium micranthum Rydb., ibid. 



Apache County to Coconino County, 5,600 to 7,200 feet, sandy soil, 

 open mesas, and pine forests, May to September. Saskatchewan, 

 Alberta, and Washington, south, to Missouri, Texas, and northern 

 Arizona. 



P. micrantha tends to have narrower leaflets than typical P. lanceo- 

 lata, but there seem to be no other differences. 



*5. Psoralea juncea Eastw., Calif. Acad. Sci. Proc. ser. 2, 6: 286. 

 1897. 



Psoralidium junceum Rydb., North Amer. Fl. 24: 17. 1919. 



This species occurs in southeastern Utah and is to be looked for in 

 northeastern Arizona. 



6. Psoralea tenuiflora Pursh, FL Amer. Sept. 475. 1814. 



Psoralidium tenuiflorum Rydb., North Amer. Fl. 24: 15. 1919. 



Apache, Navajo, and Coconino Counties, south to Cochise, Santa 

 Cruz, and Pima Counties 4,000 to 7,000 feet, dry slopes and plains, 

 often in open pine forest, May to August. North Dakota and 

 Montana to Arizona and northern Mexico. 



The prevailing form in Arizona is var. bigelovii (Rydb.) Macbride 

 (Psoralidium bigelovii Rydb.), which seems to differ from typical P. 

 tenuiflora only in its broader leaflets. 



24. PARRYELLA 



Much-branched shrubs w^ith glandular-punctate herbage; leaves 

 pinnate, the leaflets numerous; flowers small, yellowish, in terminal, 



