844 EPILOBIACEAE 
4-angled. Ovules few. Capsule stout, the angles sometimes winged above. Seeds few. 
PRIMROSE. 
Perennial: corolla 4-6.5 em. broad, widely expanding: capsule 20-30 mm. long. 1. L. triloba. 
Annual: corolla 1-2 cm. broad, barely, if at all, expanding: capsule 10-15 mm. long. 2. L. Wotsonii. 
l. Lavauxia tríloba (Nutt. ) Spach. Perennial, nearly glabrous throughout. Leaves 
basal; blades oblong-lanceolate in outline, 7-30 cm. long, runcinate-pinnatifid or sinuate, 
sometimes ciliate: corolla white or pink, 4-6.5 cm. broad: petals often 3-lobed : capsules 
ovoid, 20-30 mm. long, manifestly longer than broad, 4-winged above, reticulate-veined. 
[Oenothera triloba Nutt. ] 
In dry soil, Kentucky and Tennessee to Wyoming, California, Mississippi, Texas and northern 
Mexico. Spring and summer. 
2. Lavauxia Watsónii (Britton) Small. Similar to L. triloba in habit, but smaller 
and annual. Leaf-blades thinner and less finely pinnatifid: flowers fertilized mainly in 
the bud, the corolla barely, if at all, expanding, 1-2 cm. broad : capsules 10-15 mm. long, 
as broad as long at maturity, strongly ridged, few, or sometimes in a dense globular mass. 
[ Lavauzia triloba Watsonii Britton. ] 
On prairies, Kansas to Oklahoma. Spring and summer. 
13. GAURELLA Small. 
Low perennial herbs, with wiry diffusely branched stems. Leaves alternate: blades 
nearly entire or distantly toothed. Flowers axillary, sessile. Hypanthium slightly 
dilated at the throat. Sepals slightly longer than the hypanthium. Petals white or pink, 
spotted or striped with red. Ovary short: style stout, enlarged above. Capsule sessile, 
with a curved beak, the faces swollen. Seeds angled, delicately striate. 
1. Gaurella guttulata (Geyer) Small. Stems 1-5 dm. long, canescent with appressed 
hairs, the branches decumbent or ascending: leaf-blades lanceolate or linear-lanceolate, 
8-16 mm. long, repand-denticulate or entire: corolla white or pink, 18-25 mm. wide : 
petals obovate, entire: capsules canescent, 8-10 mm. long, angled, not winged: seeds 
angled, slipper-shaped. [Oenothera guttulata Geyer. ] 
On prairies, Nebraska to New Mexico. Summer and fall. 
14. MEGAPTERIUM Spach. 
Perennial herbs, with stout spreading stems. Leaves alternate: blades entire or 
slightly toothed, or rarely partly pinnatifid. Flowers few, but large and showy, axillary 
to leaf-like bracts. Sepals elongated. Corolla yellow. Ovary 4-angled or 4-winged : sty le 
filiform. Ovules few, sessile. Capsules broadly 4-winged. Seeds crested. PRIMROSE. 
Petals 2-4 cm. long: capsules less than 5 zi , obl to i ^ 
Stem and ieaves closely pubescent: capsules less than 2 cm. wide. x P Maryse 
em and leaves : 2 em. . EU Yepéi 
Petals 5-7 em. jong: Capsules over DAN IUE. MEOIN. 3. M. Missouriente. 
1. Megapterium Fremóntii (S. Wats.) Britton. Stems ascending, 5-15 cm. ong, 
closely appressed-pubescent : leaf-blades lanceolate to somewhat oblanceolate, or linear, 
3.5-7.5 cm. long, acuminate at the apex, entire or very nearly so, silvery canescent : epe 
2.5-3.5 cm. long: petals 3-4 em. long: capsules oblong, 2-2.5 cm. long, winged, roun 
at the summit. [Oenothera Fremontii S. Wats.] : 
On plains and prairies, Kansas to Texas. Summer. : 
2. Megapterium Oklahoménse Norton. Stemsor branches 1.5-3 dm. long, gan 1 
leaves rather numerous ; blades lanceolate or almost oblong, 4-9 cm. long, remotely too avum 
or merely undulate, glabrous : sepals nearly 2 cm. long : petals 1.5-2.5 cm. broad : caps 
oblong or oval, 2.5-3.5 em. long, rounded at the summit. 
On prairies and hillsides, Kansas to Oklahoma and Texas. Summer. di 
3. Megapterium Missouriénse (Sims) Spach. Stems decumbent or €— NEm 
densely canescent, 1.5-6 cm. long : leaf-blades thick, linear-lanceolate or oblong- rae 
5-15 cm. long, acuminate or acute at the apex, entire or remotely denticulate : sepa 
4.5-5.5 cm. long: petals 5-7 cm. long: capsules nearly orbicular, fully 5 cm. long, very 
broadly winged. EE Missouriense Sims. | 
On plains or prairies, Missouri and Nebraska to Texas. Spring and summer. 
15. GALPINSIA Britton. 
Flowers 
Perennial herbs or shrubby plants, with branched stems. Leaves alternate. EPUM 
axillary to leaf-like bracts. Hypanthium slender, the upper portion longer ee 
