634 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



31. Oenothera cardiophylla Torr., U. S. Rpt. Expl. Miss. Pacif. 



5: 360. 1856. 



Chylismia cardiophylla Small, Torrey Bot. Club Bui. 23: 193. 



1896. 



The typical form, with hypanthium 5 to 10 mm. long, petals 3 to 8 

 mm. long, and style 12 to 16 mm. long, occurs in Pinal and Yuma 

 Counties, at low altitudes, desert washes and rocky slopes, February 

 to April, ranging also into the deserts of California and Baja Cali- 

 fornia, The var. splendens Munz and Johnston (var. longituba 

 Jepson, Chylismia arenaria A. Nels.), with hypanthium 20 to 35 mm. 

 long, petals 13 to 25 mm. long, and style 30 to 60 mm. long, is more 

 common than the species in Yuma County, especially in the Gila and 

 Tinajas Altas Mountains, and is found also in adjacent California. 



32. Oenothera brevipes A. Gray, U. S. Rpt. Expl. Miss. Pacif. 4:87. 



1857. 



Chylismia brevipes Small, Torrey Bot. Club Bui. 23:194. 1896. 



Mohave and Yuma Counties, below 4,500 feet, dry washes and desert 

 plains, March to May. Nevada, western Arizona, and southeastern 

 California. 



33. Oenothera pallidula Munz, Leaflets West. Bot. 2:88. 1938. 



Oenothera brevipes var. pallidula Munz, Amer. Jour. Bot. 

 15: 229. 1928. 



Beaver Dam and Fort Mohave (Mohave County), Sentinel 

 (Maricopa County), Mohawk and Dome (Yuma County) at low 

 altitudes, open deserts, washes, etc., March to May. Utah and 

 Nevada to western Arizona and southeastern California. 



Plants from Arizona have hairier stems than those from farther 

 north and west. 



34. Oenothera multijuga S. Wats., Amer. Nat. 7: 300. 1873. 



Chylismia multijuga Small, Torrev Bot. Club Bui. 23: 193. 

 1896. 



The typical form, with petals 7 to 9 mm. long and anthers 2 to 3 

 mm. long, is found in western Coconino County and in Mohave 

 County, mostly below 2,500 feet, washes and canyons, April to June, 

 ranging into Nevada and southern Utah. The var. parviflora (S. 

 Wats.) Munz, with petals 3 to 5 mm. long and shorter, more glabrous 

 anthers, occurs in the lower Grand Canyon, and near Mead Lake 

 (Mohave County), ranging to Death Valley, Calif., and St. George, 

 Utah. The var. orientalis Munz, with leaves less basal and less di- 

 vided and petals 1.5 to 2 mm. long, occurs rarely in Coconino and 

 Mohave Counties, at Cameron, Lees Ferry, and the Grand Canyon, 

 about 4,000 feet, and ranges from western Colorado and eastern 

 Utah to northern Arizona. 



35. Oenothera scapoidea Nutt. ex Torr. and Gray, Fl. North Amer. 



1:506. 1840. 



Chylismia scapoidea Small, Torrey Bot. Club Bui. 23: 193. 



1896. 



Northeast of Rock Point, Apache County, 5,700 feet (Peebles and 

 Smith 13529), Capitan, Navajo County, 5,650 feet (Peebles and 



