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842 EPILOBIACEAE 
over 4 em. wide: capsules mostly over 2 cm. long. 
Plants glabrous or minutely pubescent : leaf-blades mainly of 
a linear or narrowly oblong type. 7. K. riparia. 
Plants hirsute :leaf-blades of an elliptic or elliptic-lanceolate 
ype. 8. K. pratensis. 
b. Petals less than 13 mm long: capsules glabrous or nearly so. 9. K. pumila. 
B. Capsules oblong or nearly so, sometimes abruptıy narrowed into a short pedi- 
cel-like base. 
Capsule-body less than 1 em. long: plants not glaucous. 10. K. fruticosa. 
Capsule-body over 1 em. long: plants glaucous. 11. K. glauca. 
1. Kneiffia linifòlia ( Nutt.) Spach. Stems slender, 1.5-4.5 dm. tall, finely pubescent 
above: basal leaves tufted, with oblanceolate or spatulate blades about 2-5 cm. long; 
stem-leaves filiform-linear, entire, 1-3 em. long: flowers in loose spike-like racemes : sepals 
2-3.5 mm. long: corolla 6-8 mm. broad: stigma-lobes very short: capsule-body ovoid, 
4-6 mm. long, puberulent, sharply 4-angled or slightly winged. [Oenothera linifolia Nutt. } 
In dry soil, Illinois to Kansas, Georgia, Louisiana and Texas. Spring and summer. 
2. Kneiffia arenícola Small. Stems erect, 1.5-4.5 dm. tall, branched above, strigil- 
lose: leaf-blades linear or nearly so, or some of them narrowly oblong, 1.5-5 cm. long, 
rather obtuse, silvery strigose, thick, often revolute, entire or essentially so: hypanthium 
somewhat hirsute : sepals 5.5-8 mm. long: petals 16-23 mm. long: capsule-body globular 
or obovoid-globose, about 4 mm. long, more or less hirsute, broadly winged above, nar- 
rowed into a relatively stout hairy pedicel-like base. 
On sand hills or in pine lands, North Carolina to Georgia and Alabama. Sunmer and fall. 
3. Kneiffia subglobósa Small. Stems slender, 2-3 dm. tall, much branched, puberu- 
lent, widely stoloniferous, red : basal leaves 4-10 cm. long, with spatulate undulately 
toothed blades, each gradually narrowed into a short petiole-like base: stem-leaves often 
numerous; blades linear or nearly so, 2-7 cm. long, entire or distantly toothed : hypan- 
thium villous or silky : sepals 6-9.5 mm. long: petals 1.5 to almost 2 cm. long: capsule- 
body globose-obovoid, 6-7 mm. long, terminating a much longer pedicel-like base, the angles 
strongly winged, the faces strongly ridged. 
In sandy soil, North Carolina to Georgia and Alabama. Summer and fall. 
4. Kneiffia longipedicellàta Small. Stems slender, puberulent, erect or assurgent, 
3-8.5 dm. tall: basal leaves with spatulate or obovate-spatulate blades 3.5-7.5 cm. long: 
stem-leaves few ; blades linear-lanceolate, 2.5-6.5 cm. long, entire, sometimes undulate: 
sepals hirsute, 12-19 mm. long: petals mostly over 2 cm. long: capsule-body narrowly ob- 
ovoid, 6-10 mm. long, terminating a much longer pedicel, the angles with stout closely 
pubescent wings, the faces strongly ridged. 
In dry soil, New York to West Virginia, Florida and Alabama. Spring and summer. 
5. Kneiffia lineàris (Michx.) Spach. Stems slender, pilose or nearly glabrous, erect 
or ascending, 1.5—5 dm. tall, finally angled : basal leaves with spatulate or broadly oblance- 
olate blades, 5-8 em. long, entire or nearly so: stem-leaves usually few ; blades linear or 
linear-lanceolate, 2.5-7.5 cm. long, slightly toothed : sepals about 1 cm. long, pue 
petals mostly 1.5-2 cm. long : capsule-body oblong-clavate, 7-14 mm. long, the angles wit 
papery glabrous or loosely pubescent wings, its faces ridged. [Oenothera linearis Michx. 
In dry or sandy soil, Connecticut to Arkansas and Georgia. Spring to fall. 
6. Kneiffia Spachiàna (T. & G.) Small. Stems minutely puberulent and somewhat 
hoary, erect, 1-4 dm. tall, terete, branched at the base or above: basal leaves spatulate 2. 
oblong-spatulate : stem-leaves few ; blades linear, 2-6 cm. long, nearly flat, obtuse or pix 
undulate, slender-petioled : sepals about 10 mm. long, minutely pubescent : petals Drs ; 
9-15 mm. long: capsule-body club-shaped, 1-1.5 cm. long, 4-winged, essentially sessile. 
[Oenothera Spachiana T. & G.] 
In sandy soil, Texas and Louisiana. Spring and summer. 
7. Kneiffia riparia ( Nutt.) Small. Stems stout, finely pubescent, 5-12 dm. tall, o 
sparingly branched : basal leaves with spatulate blades commonly over 10 cm. long : age 
leaves often numerous ; blades linear to linear-lanceolate, 5-13 cm. long, or d 
branches, acute or acutish, entire or undulate-denticulate : sepals about 2 cm. long, isa r 
pubescent : petals over 2 cm. long : capsule-body clavate, pubescent all over, mostly ove 
cm. long. [Oenothera riparia Nutt.] 
On river banks or low grounds, North Carolina to Georgia. Spring and summer. 
8. Kneiffia praténsis Small. Stems erect or nearly so, 5-11 dm. tall, often sparingly 
branched above, hirsute: leaf-blades narrowly elliptic to elliptic-lanceolate, 2.5. te 
long, undulate or sinuate, acute, thin, hirsute, flat: hypanthium more le-body 
sepals 17-22 mm. long, the free tips 2.5-4 mm. long: petals 2-3.5 cm. long: capsu cae) 
clavate, 17-21 mm. long, narrowly winged, hirsute, the pedicel-like base usually very 
In low grounds, Ohio to Missouri and Arkansas. Summer and fall. 
