496 ONAGRACEAE. (Vor. Il. 
1. Meriolix serrulata (Nutt.) Walp. 
Tooth-leaved Primrose. (Fig. 2602.) 
OEnothera serrulata Nutt. Gen. 1: 246. 1818. 
Meriolix serrulata Walp. Repert. 2:79. 1843. 
Erect, simple or branched, canescent or glabrate, 
4/-18’ high. Leaves linear-oblong or lanceolate, 
acute or acutish at the apex, narrowed at the base 
and usually sessile, sharply dentate or denticulate, 
1/-3/ long, 2/’-3’’ wide; flowers yellow, axillary, 
6’/-9’’ broad; calyx-lobes ovate, acuminate, some- 
what reflexed, the tube funnelform, silvery canes- 
cent, shorter than or equalling the ovary; petals ob- 
ovate, crenulate; stigma discoid; capsule sessile, 
linear-cylindric, silvery canescent, 8//-15’’ long, 
about 1/’ thick, slightly grooved longitudinally. 
In dry soil, Manitoba and Minnesota to Texas and 
New Mexico. May-July. 
Meriolix serrulata spinuldsa (T. & G.) Small, Bull. Torr. 
Club, 23:187. 1896. 
OEnothera serrulata var. spinulosa T. & G. Fl. N. A. 1: 502. 1840. 
More robust than the species. Leaves usually more spiny-toothed: flowers 1'-2' broad; petals 
with a dark blotch at the base. Saskatchewan, south to Missouri and Texas. 
18. GAURA L, Sp ells47. 17 53- 
Annual biennial or perennial herbs, somewhat woody at the base, with alternate nar- 
row sessile leaves, and white pink or red flowers in terminal spikes or racemes. Calyx us- 
ually pubescent, its tube narrow, prolonged beyond the ovary, deciduous, 4-lobed (rarely 
3-lobed), the lobes reflexed. Petals 4 (rarely 3), clawed, unequal. Stamens usually 8, de- 
clined; filaments filiform, each with a small scale at the base. Ovary 1-celled; united 
styles filiform, declined; stigma 4-lobed, surrounded by a cup-like border; ovules usually 4, 
pendulous. Fruit nut-like, ribbed or angled, indehiscent or nearly so, 1-4 seeded. Seeds 
unappendaged. [Greek, proud, some species being showy. ] 
About 18 species, natives of North America and Mexico. 
Fruit sessile or very nearly so; flowers spicate. 
Flowers 11!4''-2’' broad; stigma little exserted beyond its cup. 1. G. parviflora. 
Flowers 4''-5'’ broad; stigma exserted beyond its cup. 
Flowers red, turning scarlet; fruit canescent, 2. G. coccinea. 
Flowers white, turning pink; fruit villous. 3. G. biennis. 
Fruit pedicelled; flowers racemose. 
Fruit about 3’ long, the body nearly as thick as long. 4. G. Michauxiti. 
ART? 
Fruit 5'’-7'’ long, the body much longer than thick. 
Leaves mostly glabrous; fruit 7'’ long, glabrous, its stout pedicel club-shaped. 
5. G, stnuata, 
Leaves densely villous; fruit 5’’ long, pubescent, its slender pedicel nearly filiform. 
6. G. villosa. 
1. Gaura parviflora Dougl. Small- 
flowered Gaura. (Fig. 2603.) 
Gaura parviflora Dougl.; Hook. Fl. Bor. Am. 
I: 208. 1832. 
Erect, branched, villous-pubescent with 
whitish hairs, 2°-5° high. Leaves ovate- 
lanceolate, acute or acuminate at the apex, 
repand-denticulate, narrowed at the base, 
softly pubescent, 114/-4’ long, 4’’-18’” wide; 
spikes elongated, usually densely flowered; 
flowers sessile, pink, 114’/-2’’ broad, the 
ovary and calyx-tube slender; fruit sessile, 
narrowed at the base, 4-nerved, obtusely 
4-angled, glabrous or nearly so, 3/’-4’’ long. 
In dry soil, Nebraska and Missouri to Louisi- 
ana, Texas and Mexico, west to Oregon, Utah 
and New Mexico. May-Aug. 
