FLOWERING PLANTS AND FERNS OF ARIZONA 363 



10. Draba brachycarpa Nutt. ex Torr. and Gray, Fl. North Amer. 1 : 



108. 1838. 

 Devils Canyon, Pinal or Gila County (Porter 802), between Payson 

 and Pine, Gila County (Eastwood 17195a with pubescent fruits), 

 February. Virginia to Kansas, south to Florida, Texas, and central 

 Arizona. 



11. Draba cuneifolia Nutt. ex Torr. and Gray, Fl. North Amer. 1: 



108. 1838. 



Mohave, Yavapai, Gila, Pinal, Pima, and Yuma Counties, 1,000 to 

 5,000 feet, very common in sandy soil, February to April. Illinois to 

 Idaho, south to Florida, Arizona, and California. 



Both the typical form, with pubescent pods, and var. leiocarpa 



0. E. Schulz, with glabrous pods, occur in Arizona, the former being 

 the more common. The var. integrifolia S. Wats. (D. sonorae Greene, 

 D. integrifolia (S. Wats.) Greene) differs in having much-elongate 

 racemes, and apiculate fruits with pubescence, if any, of branched or 

 forked hairs. It occurs chiefly in southwestern Arizona. 



29. THYSAXOCARPUS. Lacepod, frixgepod 



Plants annual, the herbage usually nearly glabrous; stems slender, 

 erect, simple or sparingly branched, leafy; leaves sessile, usually 

 auriculate-clasping, nearly entire to deeply dentate, the basal ones 

 sometimes pinnatifid; flowers small, in elongate racemes; pods flat, 

 indchiscent, 1 -seeded, orbicular or nearly so, winged, the wing usually 

 with radiating nerves and regularly incised or perforate. 



The dainty and peculiar fruits make these otherwise insignificant 

 plants singularly attractive. The taxonomy of the genus is confused, 

 and the following disposition of the Arizona material is tentative. 



Key to the species 



1. Pods 3 to 4 mm. wide, glabrous 1. T. laciniattjs. 



1. Pods 4.5 to 7 mm. wide, glabrous to copiously pubescent, the wing regularly 

 and conspicuously notched or perforate 2. T. amplectens. 



1. Thysanocarpus laciniatus Nutt. ex Torr. and Gray, Fl. North Amer. 



1: 118. 1838. 



Mohave County, at Pagumpa Springs (Jones 5089c, 5095af), Peach 

 Springs (Lemmon in 1884), and Kingman to Chloride (Kearney and 

 Peebles 11176a), 3,500 to 5,000 feet. Western Arizona and California. 



The form occurring in Arizona seems to be var. crenatus (Nutt.) 

 Brewer (T. crenatus Nutt.), having fruits with well-defined rays, 

 notched or perforate between the rays, and leaves mostly entire to 

 coarsely dentate. A specimen collected between Kingman and Chlo- 

 ride (Kearney and Peebles 11176) approaches typical T. lad Hiatus 

 in the rayless, subentire wing, but the fruits are pubescent and are 

 large for the typical form. 



2. Thysanocarpus amplectens Greene, Pittonia 3: 87. 1896. 

 Coconino County to Greenlee (?), Santa Cruz, Pima, and Yuma 



Counties, rarely above 4,000 feet, preferring moist sandy soil, January 

 to March. Southwestern New Mexico and Arizona. 



Greene's description of T. amplectens needs considerable amplifica- 

 tion to include all of the Arizona specimens referred by the writers 



