472 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



15. LAVATJXIA Spach. 



Low, acaulescent, annual or perennial herbs, with Bimple or lyrate leaves and large 

 yellow or white flowers; hypanthium tube often much elongated; capsules stout, the 

 angles variously appendaged or smooth; seeds few. 



KEY TO THE SPECIES. 



Tips of the calyx segments not free in bud; leaves copiously hir- 

 sute 1. L. primiveris. 



Tips of the calyx segments free in bud; leaves not hirsute, or if bo 

 only on the petioles. 

 Leaves thick, grayish, densely cinereous, entire or but little 

 lobed. 



Petals 4 cm. long or less; capsules ovoid or ellipsoid 2. L. brachycarpa. 



Petals 5 to 6 cm. long; capsules attenuate to the apex 3. L. wrightii. 



Leaves thin, bright green, not cinereous, deeply pinnatifid or 

 lyrate. 

 Capsules with divaricate hooked beaks on the angles above 



the middle 4. L. hamata. 



Capsules with smooth angles. 



Petals 20 mm. long; leaves with very numerous 



crowded lobes 5. L. flava. 



Petals 35 to 40 mm. long; leaves with few distant 



lobes G. L. taraxacoides. 



1. Lavauxia primiveris (A. Gray) Small, Bull. Torrey Club 23: 182. 1896. 

 Oenothera primiveris A. Gray, PI. Wright. 2: 58. 1853. 



Type locality: "Dry hills near El Paso." Type collected by Wright (no. 1376). 

 Range: Western Texas to southern New Mexico. 



New Mexico: Rincon; Organ foothills; Me^illa Valley; Tres Hermanas. Low 

 hills and mesas, in the Lower Sonoran Zone. 



2. Lavauxia brachycarpa (A. Gray) Britton, Mem. Torrey Club 5: 235. 1894. 

 Oenothera brachycarpa A. Gray, PI. Wright. 1: 70. 1852. 



Type locality: "Between western Texas and El Paso." 



Range: Western Texas and southern New Mexico. 



New Mexico: Hillsboro; Big Hatchet Mountains; Kingston. 



3. Lavauxia wrightii (A. Gray) Small, Bull. Torrey Club 23: 183. 1896. 

 Oenothera wrightii A. Gray, PI. Wright. 2: 57. 1853. 



Type locality: Stony hills near the Copper Mines, New Mexico. Type collected 

 by Wright (no. 1072). 



Range: Southern New Mexico. 



New Mexico: Santa Rita; San Andreas Mountains. 



4. Lavauxia hamata Woot. & Standi. Contr. U. S. Nat. Herb. 16: 154. 1913. 

 Type locality: Socorro, New Mexico. Type collected by G. R. Vasey, May, 1881. 

 Range: Known only from type locality. 



6. Lavauxia flava A. Nels. Bull. Torrey Club 31: 243. 1904. 



Type locality: Laramie, Wyoming. 



Range: Wyoming to New Mexico. 



New Mexico: Rio Pueblo; Winsors Ranch; Pecos; Tunitcha Mountains; Raton; 

 Chama; Farmington; Gallo Spring. Moist meadows, in the Transition Zone. 



