724 CONTPJBUTIONS FROM THE NATIONAL HEEBARIUM. 



1. Baeria gracilis (DC.) A. Gray, Proc. Amer. Acad. 9: 196. 1874. 

 Burrielia gracilis DC. Prodr. 5: 664. 1836. 

 Type locality: "In Nova-Califomia." 

 Range: California to western New Mexico. 

 New Mexico: Duck Creek (Greene). Dry plains and low hills. 



105. PICRADENIOPSIS Rydb. 



Perennial herbs with opposite, cleft or dissected leaves and pedunculate heads of 

 yellow flowers; involucre campanulate, of obovate to oblanceolate, carinate, distinct 

 bracts; achenes narrow, quadrangular; pappus of 4 to 8 obovate or spatulate palese 

 with ecarious tips, the nerves extending to the apex of the paleee. 



key to the species. 



Pappus scales acute; leaves green 1. P. woodhousei. 



Pappus scales obtuse; leaves canescent 2. P. oppositifolia. 



1. Picradeniopfsis woodhouisei (A. Gray) Rydb. Bull. Torrey Club 37: 333. 1910. 

 Achyropa})pus woodhousei A. Gray, Proc. Amer. Acad. 6: 546. 1865. 



Bahia woodhousei A. Gray, Proc. Amer. Acad. 19: 28. 1883. 

 Type locality: "New Mexico." Type collected by Woodhouse. 

 Range: Plains of northern New Mexico and Arizona. 



New Mexico: Hurrah Creek; mesa near Atarque de Garcia; Zuni; Nara Visa. 

 Upper Sonoran Zone. 



2. Picradeniopsis oppositifolia (Nutt.) Rydb. in Britton, Man. 1008. 1901. 

 Trichophyllum oppositifolium Nutt. Gen. PI. 2: 167. 1818. 



Bahia oppositifolia Nutt.; Torr. & Gray, Fl. N. Amer. 2: 376. 1842. 



Type locality: "On denudated sterile hills, near Fort Mandan," North Dakota. 



Range: Montana and North Dakota to Arizona and western Texas. 



New Mexico: Santa Fe; Sierra Grande; Las Vegas; Kennedy; Albuqiierque; 

 Clayton; Johnsons Basin; Gray; Taos. Plains and low hills, in the Upper Sonoran 

 Zone. 



105a. BAHIA Lag. 



Perennial herb with opposite impressed-punctate 3-cleft leaves, or the lower leaves 

 sometimes entire; flowers yellow, the heads pediuiculate; involucre campanulate, the 

 bracts distinct, not carinate; achenes pubescent, the pappus of 4 to 8 obovate palese, 

 the nerves not extending to the apex of the paleae. 



1. Bahia dealbata A. Gray, Mem. Amer. Acad. n. ser. 4: 99. 1849. 



Bahia absinthifolia dealbata A. Gray, PI. Wright. 1: 121. 1852. 



Type locality: "Valley between Mapimi and Guajuquilla, and at Cadenas, 

 Chiliuahua." 



Range: Western Texas to southern Arizona and southward. 



New Mexico: Socorro; Grant County; Dona Ana Mountains; mesa west of Organ 

 Mountains; James Canyon. Sandy plains and low hills. Lower Sonoran Zone. 



106. ACHYROPAPPUS H. B. K. 



Slender annual with opposite dissected impressed-punctate leaves and small 

 pedunculate heads; involucre hemispheric, of about 10 distinct oblanceolate bracts; 

 rays none; achenes hirsute at the slender base; pappus of short obovate palese with 

 scarious tips and somewhat thickened bases. 



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