846 EPILOBIACEAE 
** Lower cauline leaves with obtuse blades, manifestly wider than 
those of the upper leaves, the teeth rather blunt. 4. M. Drummondiana. 
b. Leaf-blades linear-filiform. 5. M. capillifolia. 
B. Free portion of the hypanthium brown-purple within: stigma brown-purple. 
Plant, at least the upper portions. pale-pubescent: petals over 15 mm. long. 6. M. melanoglottis. 
Plant glabrous or nearly so: petals less than 15 mm. long. 7. M. Hillii. 
1. Meriolix serrulàta ( Nutt.) Walp. Stems often copiously branched at the base, 
the branches canescent, 1-5 dm. high : leaf-blades spatulate to linear-oblong, or linear, 2-5 
em. long, serrate: hypanthium 3-4 mm. broad at the mouth, the free portion yellow 
within : sepals 5-7 mm. long: petals obovate, 8-12 mm. long, crenulate : anthers 2.5-3 mm. 
ions ` capsules linear-cylindric, 1.5-2 cm. long, about 1.5 mm. thick. [ Oenothera serrulata 
utt. 
In dry soil, Manitoba and Minnesota to Texas and New Mexico. 
2. Meriolix intermédia Rydb. Similar to M. serrulata in habit, but mostly taller, 
and larger throughout. Stem and leaves, especially on the upper part of the plant, 
markedly whitish or grayish pubescent : leaf-blades spatulate to linear, 4-7 cm. long, or 
shorter on the branches, serrate : hypanthium 6-10 mm. broad at the mouth, the free por- 
tion yellow within : sepals 7-8 mm. long : petals 2-2.5 cm. long : capsules 2-2.5 cm. long, 
pubescent. 
In dry or stony soil, Manitoba to Minnesota and Texas. 
3. Meriolix spinulòsa (T. & G.) Heller. Similar to M. serrulata in habit, but more 
slender : leaf-blades linear-spatulate to narrowly linear, 3-8 cm. long, or sometimes shorter, 
spinulose-serrate, or sharply serrate : hypanthium 4-5 mm. broad at the mouth, the free 
portion yellow within: sepals 5-6 mm. long: petals 18-22 mm. long: anthers 4-4.5 mm. 
T oe 2-3 em. long, about 2 mm. thick, sparingly pubescent. [Oenothera serrulata 
On plains or prairies, Arkansas to Texas and New Mexico. 
4. Meriolix Drummondiàna (Spach.) Small. Stem branched at the base, the 
branches ascending or decumbent, 0.5-3 dm. long, sometimes branched above : leaf-blades 
various, those of the lower cauline leaves spatulate, 1-2 cm. long, obtuse, rather bluntly 
toothed, those of the upper cauline leaves linear, usually narrowly so, more sharply but 
less prominently toothed than those of the lower leaves: hypanthium 5-6 mm. wide at the 
mouth, the free portion yellow within: sepals 5-6 mm. long: petals 2-2.5 cm. long: an- 
thers 44.5 mm. long: capsules 1-1.5 em. long, sparingly pubescent. [Calylophis Drum- 
mondiana Spach. ] 
In open woods or dry soil, Texas. 
5. Meriolix capillifdlia (Scheele) Small. Stem branched at the base, the branches 
3-5 dm. tall, slender, glabrous or nearly so: leaf-blades linear-filiform or very narrowly 
linear, 2-5 em. long, entire or essentially so, revolute: hypanthium 3-4 mm. broad at the 
throat, yellow within: sepals 5-6 mm. long: petals 15-20 mm. long: anthers 3-4 mm. 
long: capsules 2-2.5 cm. long, 1-1.5 mm. thick. [Oenothera capillifolia Scheele. Oenothera 
serrulata var. pinifolia Engelm.] 
In dry or stony soil, Texas. 
: 6. Meriolix melanoglóttis Rydb. Stem usually branched at the base, the pred 
ascending or decumbent, 2.5-4 dm. tall, the upper portion as well as the leaves, paie- 
pubescent, the bark yellowish: leaf-blades spatulate to almost linear, 2.5-6 cm. long, 
rather shallowly serrate, flat: hypanthium 5-6 mm. wide at the mouth, the free portion 
brown-purple within : capsules straight, nearly 2 cm. long, copiously pubescent. 
In dry soil, Texas to Colorado. 
7. Meriolix Hillii Small. More slender than M. melanogloitis, glabrous or nearly 
so, the branches often wiry, the bark whitish: leaf-blades narrowly linear-spatulat® (d 
narrowly linear, 2-4.5 cm. long, sinuate-toothed, involute : hypanthium 3-4 mm. wt r M. 
the mouth, the free portion brown-purple within : capsules more slender than those ot J£. 
melanoglottis, incurved, nearly glabrous. 
In dry or sandy soil, Texas. 
17. GAURA L. 
Annual, biennial or perennial herbs, with branching stems. Leaves alternate : blades 
narrow, or relatively so. Flowers in terminal spikes or racemes. Hypanthium gore 
prolonged beyond the ovary. Sepals 4 or rarely 3. Petals unequal, with clawed ae y 
Stamens usually 8, declined, each filament with a small scale at the base. Ovary rem : 
style declined : stigma 4-lobed, surrounded by a cup-like border. Ovules usually 4, pen 
