Vo. IL] EVENING-PRIMROSE FAMILY. 493 
13. LAVAUXIA Spach, Hist. Veg. 4: 366. 1835. 
Low perennial usually acaulescent herbs, rarely producing short stems. Leaves mostly 
basal, pinnatifid, numerous. Flowers perfect, white, pink or pale yellow. Calyx-tube 
slender, dilated at the throat; calyx-segments finally reflexed, the tips free in the bud or 
united. Petals 4, spreading. Stamens 8, the alternate ones longer; filaments filiform; an- 
thers linear. Ovary short, 4-angled; stigma 4-cleft; ovules few. Capsules stout, their angles 
sometimes winged above. Seeds few. [In honor of Francois Delavaux, founder of the botan- 
ical garden at Nismes. ] 
About 6 species, chiefly in southern North America. 
Leaves membranous; capsules beaked, glabrate. 1. L, triloba. 
Leaves leathery; capsules hardly beaked, pubescent. ' 2. L. brachycarpa. 
1. Lavauxia triloba (Nutt.) Spach. 
Three-lobed Primrose. (Fig. 2596.) 
Sel ik triloba Nutt. Journ. Acad. Phil. 2: 
Ee Spach, Hist. Veg. 4: 367. 1835. 
Nearly glabrous throughout. Leaves pet- 
ioled, runcinate-pinnatifid, or sinuate, some- 
times ciliate, oblong-lanceolate in outline, 3/- 
12’ long, sometimes 2’ wide, the apex acute 
or acutish; flowers white or pink, 1/-2%4’ 
broad; calyx-lobes lanceolate, spreading, the 
tube slender, somewhat dilated at the summit, 
many times longer than the ovary, 2/—4’ long; 
petals often 3-lobed; capsule ovoid, 4-wing- 
angled, reticulate veined, 6’/-12’’ long; seeds 
finely and densely tuberculate. 
In dry soil, Kentucky and Tennessee to Arkan- 
sas, Utah and California, south to Mississippi, 
Texas and northern Mexico. May-July. 
Lavauxia triloba Watsonii Britton, Mem. Torr. Club, 5: 235. 1894. 
OEnothera triloba var. parviflora S. Wats. Proc. Am. Acad. 12: 251. 1876. 
Annual; flowers smaller; fruit densely crowded. Perhaps a distinct species. Kansas (and 
Nebraska ?). 
2. Lavauxia brachycarpa (A. Gray) Brit- 
ton. Short-podded Primrose. 
(Fig. 2597.) 
OEnothera brachycarpa A. Gray. Pl. Wright, t:70. 1852. 
Lavauxta brachycarpa Britton, Mem. Torr. Club, 5: 
235. 1894. 
Low, perennial by a stout root, acaulescent or 
nearly so, softly canescent. J,eaves basal, leathery, 
ovate to narrowly oblong, 3/—9’ long, acute or ob- 
tuse, lyrate-pinnatifid or sometimes nearly entire; 
petioles sometimes as long as the blade; flowers yel- 
low, basal; calyx canescent, its tube 2’-4/ long, grad- 
ually dilated upward, its segments linear-lanceo- 
late, about one-half as long as the tube, the tips 
free in the bud; petals 1/-114/ long, undulate; cap- 
sules elliptic, 8’’-9/” long, leathery or corky, the 
angles very thin, the faces somewhat wrinkled. 
Montana to Kansas, Texas and New Mexico, April- 
July. 
14. GAURELLA Small, Bull. Torr. Club, 23: 183. 1896. 
Low perennial canescent or strigillose herbs with wiry diffusely branched stems, eaves 
small, narrow, nearly entire or distantly toothed, narrowed into very short petioles. Flowers 
axillary, sessile. Calyx purplish, its tube cylindric, slightly dilated at the throat, its seg- 
ments narrow, slightly longer than the tube, their tips united in the bud. Petals obovate, 
white or pink, spotted or striped with red. Stamens 8, the alternate ones longer; filaments 
filiform-subulate; anthers linear. Ovary 4-angled, short; united styles stout, enlarged 
