EPILOBIACEAE 847 
dulous. Fruit nut-like, ribbed or angled, indehiscent or nearly so, 1-4-seeded, sessile or 
often with a pedicel-like base. 
Anthers oval, attached near the middle. 1. G. parviflora. 
Anthers linear or narrowly oblong, attached near the base. 
Fruit sessile or essentially so, that is, without a pedicel-like base. 
Petals over 15 mm. long. 2. G. Lindheimeri. 
Petals less than 12 mm. long. 
Fruit ovoid, elliptic, oval-elliptie or obovoid. 
Fruit pubescent: buds puberulent or pubescent. 
Fruit 6-8 mm. long: buds less than 2 em. long. 
Fruit with rounded or obtuse angles. 
Stems hirsute: leaf-blades relatively thin. 3. G. biennis. 
Stems puberulent or puberulent-canescent: leaf-blades rela- 
tively thick. 4. G. Pitcheri. 
Fruit with sharp angles. 
Stem simple or with few ascending branches above: species 
ranging from South Carolina to Florida and Alabama. 5. G. angustifolia. 
Stem diffusely much branched : species of the lower Mississippi 
valley. 6. G. filiformis. 
Fruit 3-4 mm. long: buds over 2 em. long. 7. G. longiflora. 
Fruit glabrous: buds glabrous or essentially so. 8. G. suffulta. 
Fruit pyramidal. 
Fruit mainly 3-angled, the base and angles rounded. 9. G. tripetala. 
f Fruit mainly 4-angled, the base flat, the angles auricled at the base. 10. G. brachycarpa. 
Fruit contracted into a slender or stout neck-like or pedicel-like base. 
Pedicel-like base of the fruit very stout and short, angled or ribbed, but less 
so than the body of the fruit. 
Fruit 5-7 mm. long: bracts persistent : sepals slightly longer than the free 
part of the hypanthium. 11. G. coccinea. 
Fruit 8-11.5 mm. long : bracts caducous: sepals about twice as long as the 5 
. free part of the hypanthium. 12. G. Drummondii. 
Pedicel-like base of the fruit relatively slender and long. ; or 
Body of the fruit 3-4 mm. long, ovoid, pubescent. 13. G. Michauxii. 
Body of the fruit 7-10 mm. long, oblong or fusiform, glabrous. 
Fruit-body fusiform, merely angled: leaves finely and inconspicuously : 
pubescent. 14. G. sinuata. 
Fruit-body oblong or nearly so, wing-angled: leaves copiously pubescent. 15. G. villosa, 
1. Gaura parviflóra Dougl. Stem 6-15 dm. tall, villous-hirsute with whitish hairs: 
leaf-blades lanceolate, ovate-lanceolate or elliptic, 3.5-10 cm. long, acute or acuminate, 
repand-dentate, softly pubescent: spikes elongated, many-flowered: buds glabrous or 
nearly so: flowers crowded or approximate: petals 2.5-4 mm. long: fruit fusiform, 6-8 
mm. long, 4-nerved, obtuse between the angles, glabrous or nearly so. 
In dry soil, South Dakota to Oregon, Missouri, Louisiana and Mexico. Spring and summer. 
. 2. Gaura Lindheimeri Engelm. & Gray. Stem 5-9 dm. tall, strigose, or somewhat 
hirsute below, more or less branched above: leaf-blades spatulate or oblong to lanceolate, 
2.5-7 cm. long, or shorter above, acute, sinuate, strigose : spikes several-flowered : buds 
pilose : flowers not crowded : petals 17-22 mm. long: fruit oblong or elliptic-oblong, 5-7 
mm. long, glabrous, with acute angles and 1-ribbed faces. 
On prairies, Louisiana and Texas. Spring and summer. 
. 3. Gaura biénnis L. Stem 6-15 dm. tall, villous-hirsute : leaf-blades relativel 
thin, lanceolate, oblong-lanceolate or elliptic, 3-10 cm. long, acute or acuminate at eac 
end, remotely denticulate or merely undulate : spikes slender, often elongated : buds pubes- 
cent: flowers numerous : corolla white, sometimes turning pink: petals 7-11 mm. long: 
fruit elliptic to oval-elliptic, 6-10 mm. long, 4-ribbed, more or less hirsute. 
In dry soil, Quebec and Ontario to Minnesota, Georgia and Mississippi. Summer and fall. 
4. Gaura Pítcher (T. & G.) Small Similar to G. biennis in habit, but larger and 
stouter, often copiously branched, merely puberulent or puberulent-canescent : leaf-blades 
thick, narrowly elliptic to lanceolate or linear-lanceolate, 4-11 cm. long, remotely denticu- 
late or almost entire: spikes many-flowered, often elongated : buds puberulent: flowers 
not densely crowded : corolla pinkish : petals 6-9 mm. long : fruit elliptic to ovoid-elliptic, 
mm. long, puberulent. 
On prairies, Iowa to Nebraska and Arkansas. Summer and fall. 
5. Gaura angustifolia Michx. Stem 7-12 dm. tall, simple or sparingly branched 
above, finely appressed-pubescent : leaves relatively few ; blades spatulate to linear or linear- 
lanceolate, 1-6 cm. long, acute, sinuate or nearly entire, sparingly pubescent: spikes vir- 
gate, sometimes greatly elongated : buds finely pubescent to glabrate: petals white or pink, 
-7 mm. long : fruit elliptic, 5-9 mm. long, 4-angled or sometimes 5-angled, the faces occa- 
sionally transverse-wrinkled. 
In dry or sandy soil, North Carolina to Florida and Alabama. Spring to fall. 
.. 6. Gaura filifórmis Small. Stem 1-2.5 m. tall, canescent-puberulent, widely and often 
diffusely branched above, the branches slender or filiform : leaves numerous ; blades linear 
