2'70 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Rance: Colorado and Utah to Texas and northern Mexico. 
New Mexico: San Juan Valley; Zuni; Mimbres; Sabinal; Florida Mountains; 
Noria; Mesilla Valley; Organ Mountains; Jarilla Mountains; Melrose; 35 miles west of 
Roswell. Dry hills and mesas, in the Lower and Upper Sonoran zones. 
This is one of the first plants to bloom in the spring, continuing in flower until 
summer. It is abundant in many parts of the State, especially on sandhills and 
gravelly mesas. 
2. Dithyraea griffithsii Woot. & Standl. Contr. U. S. Nat. Herb. 16: 124. 1913. 
TyPE Locality: Arroyo Ranch near Roswell, New Mexico. Type collected by 
David Griffiths (no. 5687). 
Rance: New Mexico. 
New Mexico: Arroyo Ranch; Zuni. Plains, in the Lower and Upper Sonoran 
zones. . 
10. PHYSARIA A. Gray. DovuBLe BLADDER-Pop. 
A low stellate-pubescent silvery-canescent cespitose perennial with obovate- 
spatulate leaves; racemes few-flowered; petals linear, yellow; siliques membranous, 
the two cells inflated-globose and joined by the narrow septum. 
1. Physaria newberryi A. Gray in Ives, Rep. Colo. Riv. 6. 1861. 
Type Locality: Near Tegua, Arizona (one of the Moqui villages). 
Rance: Nevada and Colorado to New Mexico and Arizona. 
New Mexico: Western San Juan and McKinley counties. Dry hills and plains, 
in the Upper Sonoran Zone. 
11. NERISYRENIA Greene. 
Canescent herbaceous perennials 20 to 40 cm. high, branching from the base, 
densely covered with soft stellate hairs; racemes somewhat elongated; flowers white, 
purplish-tinged, about 1 cm. long; siliques 1 to 2 cm. long, oblong, compressed con- 
trary to the septum, appearing somewhat quadrangular, tipped by the persistent 
style. 
KEY TO THE SPECIES. 
Leaves linear, entire.....................-222220-0000- Lene ceceeee 1. N. linearifolia. 
Leaves obovate or oblanceolate, toothed or pinnatifid............. 2. N. camporum. 
1. Nerisyrenia linearifolia (S. Wats.) Greene, Pittonia 4: 225. 1900. 
Greggia linearifolia 8S. Wats. Proc. Amer, Acad. 18: 191. 1883. 
Parrasia linearifolia Greene, Erythea 3: 75, 1895. 
Type LOcALITY: Presidio on the Rio Grande, Texas. 
Rance: Western Texas and southern New Mexico. 
New Mexico: White Sands; plains 35 miles south of Torrance; Lakewood; Los 
Mitos. In gypsum soil, in the Lower Sonoran Zone. 
2. Nerisyrenia camporum (A. Gray) Greene, Pittonia 4: 225. 1900. 
Greggia camporum A. Gray, Pl. Wright. 1: 8. pl. 1. 1852. 
Parrasia camporum Greene, Erythea 8: 75. 1895. 
Type Locauity: ‘‘High prairies and calcareous hills, at the head of the San Felipe,”’ 
Texas. 
Rance: Western Texas to New Mexico, south into Mexico. 
New Mexico: Upper Corner Monument; Tortugas Mountain; plains south of White 
Sands; Tres Hermanas; White Mountains; Jarilla Mountains; Organ Mountains. 
Dry hills and plains, in the Lower Sonoran Zone. 
