EPILOBIACEAE 843 



9. Kneiffia pumila (L.) Spach. Stems sometimes finely puberulent, erect, 2-6 dm. 

 high : basal leaves with oblanceolate or spatulate blades : stem-leaves few or many ; blades 

 oblong, linear or elliptic, 2-8 cm. long, entire or very nearly so : sepals 5-7 mm. long : 

 petals 6-9 mm. long : capsule-body obovoid or oblong -obo void, 6-12 mm. long, sessile or 

 short -pedicelled, glabrous or nearly so, the 4 wings thick. [Oenothera pumila L.] 



In dry soil, Nova Scotia to Manitoba, Georgia and Kansas. Spring and summer. 



10. Kneiffia fruticosa (L. ) Eaimann. Stems usually branched, 3-9 dm. tall, com- 

 monly slightly pubescent : leaf-blades lanceolate, ovate-lanceolate or oblong, 2.5-10 cm. 

 long, repand-denticulate, or rarely nearly entire : sepals 15-20 mm. long : petals 2-3 cm. 

 long : capsule-body oblong, 6-9 mm. long, prominently winged, glabrous or slightly pubes- 

 cent, sometimes abruptly narrowed into pedicel-like base. [Oenothera fruticosa L.] 



In dry soil, Nova Scotia to Georgia, Minnesota and Louisiana. Spring and summer. Kneiffia fruti- 

 cosa pilosella (Raf.) Britton, is pubescent with long spreading hairs throughout and is widely distributed 

 in the range of the species. 



11. Kneiffia glauca (Michx. ) Spach. Stems glabrous and glaucous, 4-9 dm. high : 

 leaf-blades ovate or oval, 5-14 cm. long, repand-denticulate : sepals 20-25 mm. long : 

 petals 2.5-3 cm. long : capsule-body oblong, 11-13 mm. long, broadly 4-winged, glabrous, 

 abruptly narrowed into the short pedicel-like base. [Oenothera glauca Michx.] 



In dry woods, mountains of Virginia to Georgia and Alabama. Spring to fall. 



11. HARTMANNIA Spach. 



Annual or perennial herbs, with branched stems. Leaves alternate : blades commonly 

 pinnatifid or lyrate. Buds drooping. Flowers diurnal, in terminal spikes or apparent 

 racemes. Hypanthium funnelform. Corolla white, red or purple. Ovary elongated. 

 Ovules numerous, on slender stalks, in many rows. Capsule club-shaped, oblong or 

 elliptic, 4-winged, the body sometimes narrowed into a pedicel-like base. Seeds not 

 tuberculate. The plants flower from spring to fall. PRIMROSE. 



Petals less than 20 mm. long : capsule-body shorter than the pedicel-like base. 1. H. rosea. 

 Petals over 20 mm. long : capsule- body longer than the pedicel-like base. 



Stem with spreading hairs : capsule-body with a pedicel -like base. 2. H. tetraptera. 



Stem with appressed hairs : capsule-body without a pedicel-like base. 3. H. speciosa. 



1. Hartmannia rosea (Ait.) G. Don. Stems slender, puberulent, erect or ascending, 

 2-6 dm. tall, branched at the base or throughout : basal leaves with oblanceolate blades 

 4-6 cm. long : stem-leaves often numerous ; blades ovate-lanceolate or oblong, 1-5 cm. 

 long, obtuse or acute, entire or distantly toothed, the lower ones sometimes pinnatifid at 

 the base : spikes much interrupted, with leaf-like bracts : sepals 7-9 mm. long : petals 

 deep pink or purple, suborbicular, 9-13 mm. long, entire : capsules club-shaped, the body 

 5-10 mm. long, the angles winged, the faces prominently ridged, the pedicel-like base 

 usually longer than the body. [Oenothera rosea Ait.] 



On plains or prairies, Texas to New Mexico, Central and northern South America. 



2. Hartmannia tetraptera (Cav.) Small. Stem rather slender, hirsute, erect or 

 decumbent, 1-3 dm. long, simple or usually branched at the base: leaf-blades mostly pin- 

 natifid, rarely only coarsely toothed, 2-7 cm. long, variable in shape, the lower ones often 

 ovate in outline, the rest varying from lanceolate to oblanceolate, acute : spikes few-flow- 

 ered : sepals 14-18 mm. long : petals purple or rose-purple, often rounded, 2.2-3 cm. long : 

 capsules club-shaped, 3-4 cm. long, the body obovoid, usually longer than the pedicel-like 

 base, its angles winged, the faces ridged. [Oenothera tetraptera Cav.] 



On plains or prairies, Texas to Arizona, Mexico, Central America and northern South America. 



3. Hartmannia speciosa (Nutt. ) Small. Stems relatively stout, strigillose-canes- 

 cent, erect, ascending or somewhat decumbent, 2-7 dm. tall, simple or branched : leaf- 

 blades lanceolate or oblong, or sometimes nearly linear, 2-12 cm. long, obtuse or acute, 

 distantly toothed or pinnatifid, the lower ones sometimes lyrate : spikes lax : sepals 2-4 

 cm. long : petals white, turning pink, obovate or suborbicular, 2.5-5 cm. long, retuse or 

 emarginate at the apex : capsules oblong or elliptic, 1-2 cm. long, not narrowed into a 

 pedicel-like base, the angles stoutly winged, the faces each with a stout ridge. [ Oenothera 

 speciosa Nutt.] 



On plains and prairies, Missouri and Kansas to Louisiana, Texas, Arizona and northern Mexico, 

 and extensively naturalized in Illinois, South Carolina and Georgia. 



12. LAVAUXIA Spach. 



Perennial or annual usually low acaulescent herbs. Leaves mostly basal : blades pin- 

 natifid. Flowers few. Sepals narrow. Corolla white, pink or pale yellow. Ovary short, 



