183 
Western Texas and New Mexico, probably in Nevada and 
Montana. 
4. LavauxiA Wricutu (A. Gray). 
OLnothera Wrightti A. Gray, Pl. Wright. 2: 57. 1853. 
New Mexico. 
8. GAURELLA. 
Perennial herbs low, wiry, diffuse, canescent or strigilose. Stems 
at length branched throughout and spreading, leafy, clothed 
with a longitudinally wrinkled bark ; leaves small, linear-lanceolate 
or lanceolate, nearly entire or distantly toothed, narrowed into a 
very short petiole; flowers axillary, white or rose-colored, spotted 
or striped with red; calyx purplish, its tube cylindric, slightly 
dilated at the throat, twice as long as the ovary, its segments 
slightly longer than the tube; their tips not free in the bud; petals 
obovate, truncate or emarginate; filaments filiform-subulate; 
anthers linear; ovary sessile, 4-angled; style stoutish, enlarged at 
the top; stigmas filiform ; capsule ovoid-pyramidal, sessile, at- 
tenuate into a slender curved beak, the angles keeled, the faces 
swollen; seeds obovoid, angled, pointed at the base; delicately 
Striate. 
A perfectly distinct genus, with no very close affinity to re- 
lated groups. It differs from Megapterium, with which it has been 
associated, in habit, foliage, inflorescence and fruit. 
¥1. GAURELLA GUTTULATA (Geyer). 
OEnothera canescens Torr. & Frem., Frem. Rep. 315. 1845. 
Not OE. biennis var. canescens T. & G. 1840. 
OLnothera guttulata Geyer; Hook. Lond. Journ. Bot. 6: 222. 
1847. 
: Megapteritum canescens Britton, Mem. Torr. Club, 5: 235. 1894. 
Wyoming to Kansas and New Mexico. 
9. MEGAPTERIUM Spach, Hist. Veg. 4: 363. 1835. 
Leaves entire or nearly so. 
Capsule (with wings) oblong, 2-3 cm. long. 
Capsule (with wings) suborbicular, 5-6 cm. long. 
Leaves pinnatifid. 
1. Mecaprerium Fremontu (S. Wats.) Britton. 
OEnothera Fremontii S. Wats. Proc. Am. Acad. 8: 587. 1873. 
Megapterium Fremontii Britton, Mem. Torr. Club, 5: 286. 1893. 
Kansas to Texas. fee 
1. Md. Fremontii. 
2, M. Missouriense. 
3. M. dissectum. 
