FLOWERING PLANTS AND FERNS OF ARIZONA 035 



Fulton 11915), below Black Falls, Little Colorado River, Coconino 

 County (X. F. Ward in 1901). 



The Arizona form is var. seorsa (A. Nels.) Munz, which ranges from 

 Wyoming to Oregon and northern Arizona. 



36. Oenothera clavaeiormis Torr. and Frem. in Frem., Exped. Rocky 



Mount. Rpt. 314. 1845. 



Chylismia clavaeformis Heller, Muhlenbergia 2: 105. 1906. 



The var. aurantiaca (S. Wats.) Munz, with white flowers and 

 strigulose hypanthium and sepals, is found in Mohave, Graham, 

 Gila, Pinal, Maricopa, and Yuma Counties, below 3,000 feet, washes 

 and sandy places, March to April and occasionally in autumn, rang- 

 ing from southwestern Utah to Arizona and California. The var. 

 peeblesii Munz, with white flowers and glandular-puberulent hypan- 

 thium, sepals, and ovaries, occurs in Yavapai, Pinal, Maricopa, 

 Cochise, Pima, and Yuma Counties, below 3,500 feet, washes and dry 

 sandy places, March to May, known only from south-central Arizona. 

 The var. peirsonii Munz, with spreading-villous stems and yellow 

 flowers, has been collected between Growler Pass and Tule Well, 

 Pima or Yuma County (Kearney and Peebles 10859), and occurs also 

 in the Colorado Desert of California and in northern Baja California. 



37. Oenothera parryi S. Wats., Amer. Nat, 9: 19, 270. 1875. 



Chylismia parryi Small, Torrey Bot. Club Bui. 23: 193. 1896. 



Extreme northern Coconino and Mohave Counties, at Fredonia 

 (Jones in 1929) and north of Wolf Hole (Peebles and Parker 14760), 

 3,500 to 4,500 feet, May and June. Southwestern Utah and north- 

 western Arizona. 



Petals bright yellow. 



8. GAYOPHYTUM^ 



Annuals with slender stems and filiform branches; leaves alternate, 

 entire; flowers very small; petals white or pink; stamens 8, the alter- 

 nate ones much reduced and usually sterile. 



Key to the species 



1. Capsules not torulose, subsessile; plants branched only at base or sparingly 



above; upper leaves well developed 3. G. racemostjm. 



1. Capsules torulose, pedicelled; plants freely branched above the base, repeatedly 

 dichotomous; upper leaves bractlike (2). 

 2. Petals 0.5 mm. long; capsules 2 to 5 mm. long, shorter than the usually 



deflexed pedicels; plants quite glabrous 1. G. ramosissimum. 



2. Petals 1 to 1.5 mm. long; capsules 5 to 12 mm. long, exceeding the erect or 

 ascending pedicels 2. G. xuttallii. 



1. Gayophytum ramosissimum Torr. and Grav, Fl. North Amer. 1 : 513. 



1840. 



Coconino County, 6,500 to 9,000 feet, open places in pine forests, 

 June to August. Colorado to Washington and northern Arizona. 



2. Gayophytum nuttallii Torr. and Grav, Fl. North Amer. 1: 514 



1840. 



Lukachukai Mountains (Apache County) Coconino County, Pres- 

 cott (Yavapai County) 6,000 to 9,500 feet* open places in pine woods. 



95 Reference: Munz, P. A. studies ix oxagraceae— VIII. THE GENT7S GAYOPHYTUM. Amer. Jour. 

 Bot. 19: 768-778. 1932. 



