724 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
1. Baeria gracilis (DC.) A. Gray, Proc. Amer. Acad. 9: 196. 1874. 
Burrielia gracilis DC. Prodr. 5: 664. 1836. 
Tyre Locauity: “In Nova-California.’’ 
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 pales 
with scarious tips, the nerves extending to the apex of the palex. 
KEY TO THE SPECIES, 
Pappus scales acute; leaves green..............2200-00- ec eceeee 1. P. woodhousei. 
Pappus scales obtuse; leaves canescent................ececeeee ees 2. P. oppositifolia. 
1. Picradeniopsis woodhousei (A. Gray) Rydb. Bull. Torrey Club 37: 333. 1910. 
Achyropappus 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. 
RanGeE: 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. Pl. 2: 167. 1818. 
Bahia oppositifolia Nutt.; Torr. & Gray, Fl. N. Amer. 2: 376. 1842. 
Type Locauty: ‘On denudated sterile hills, near Fort Mandan,” North Dakota. 
Rance: Montana and North Dakota to Arizona and western Texas. 
New Mexico: Santa Fe; Sierra Grande; Las Vegas; Kennedy; Albuquerque; 
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 pedunculate; involucre campanulate, the 
bracts distinct, not carinate; achenes pubescent, the pappus of 4 to 8 obovate pale, 
the nerves not extending to the apex of the palee. 
1. Bahia dealbata A. Gray, Mem. Amer. Acad. n. ser. 4: 99. 1849. 
Bahia absinthifolia dealbata A. Gray, Pl. Wright. 1: 121. 1852. 
TYPE LocaLity: ‘Valley between Mapimi and Guajuquilla, and at Cadenas, 
Chihuahua.” 
Rance: 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 pales with 
scarious tips and somewhat thickened bases. 
