EPILOBIACEAE 841 



broadest above the middle on the lower part of the stem, 5-10 cm. long, sessile and 

 rounded at the base or the lower narrowed into petioles, acuminate at the apex, remotely 

 denticulate : sepals closely strigose : petals rhombic-obovate, 2-3 cm. long : capsules 

 columnar, curved, 12-16 mm. long, closely pubescent : seeds obovoid, tuberculate at 

 the top. 



On prairies, Minnesota to Indiana, Nebraska and the Indian Territory. Spring and summer. 



9. ANOGRA Spach. 



Caulescent annual or perennial herbs, often with a papery bark. Stems often some- 

 what woody. Leaves alternate : blades usually pinnatifid. Buds drooping. Flowers 

 usually axillary, diurnal. Hypanthium elongated. Sepals narrow. Corolla white or 

 pink. Ovary slender. Ovules numerous, in 1 row in each cavity, ascending. Capsules 

 elongated, spreading or ascending, loculicidal. Seeds terete. EVENING PRIMROSE. 



Sepals without free tips in the bud. 1. A. albicaulis. 

 Sepals with free tips in the bud. 



Hypanthium villous in the throat. 2. A. coronopifolia. 



Hypanthium glabrous in the throat. 3. A. Nuttallii. 



1. Anogra albicaulis (Pursh) Britton. Stems diffusely branched, the branches 

 decumbent or ascending, 1-3 dm. long, more or less hirsute or puberulent, with whitish and 

 often shreddy bark : leaves alternate ; blades oblanceolate or lanceolate, deeply pinnatifid 

 or the lower ones repand-dentate (rarely entire), 2.5-10 cm. long : sepals lanceolate, acu- 

 minate, hirsute, the tips not free in the bud : corolla 3.5-7.5 cm. broad, white, becoming 

 rose-color: capsules linear-cylindric, 2.5-3.5 cm. long: seeds finely pitted, \_0enothera 

 albicaulis Pursh.] 



On prairies, North Dakota and Nebraska to Mexico. Spring and summer. 



2. Anogra coronopifolia (T. & G.) Britton. Stems erect or nearly so, branched, 

 1.5-6 dm. tall, more or less hispid or canescent : leaf-blades lanceolate or oblanceolate in 

 outline, 1.2-5 cm. long, usually finely and deeply pinnatifid into linear-oblong lobes: 

 sepals linear: corolla white, turning pink, 1.8-3 cm. broad: capsules oblong, abruptly 

 constricted at the top, straight, 8-20 mm. long, about 4 mm. thick : seeds tuberculate. 

 [ Oenothera coronopifolia T. & G. ] 



On prairies, South Dakota to Utah, Texas and New Mexico. Spring to fall. 



3. Anogra Nuttallii (Sweet) Rydb. Stems erect, 1.5-12 dm. tall, white or pale, 

 rarely with scattered hairs, the bark often shreddy : leaf -blades linear or oblong-linear, 

 2.5-8.5 cm. long, entire, repand or somewhat pinnatifid: sepals linear: corolla white, 

 turning pink, 2.5-3.5 cm. broad: capsules linear, curved, 2.5-5 cm. long, about 3 mm. 

 thick : seeds smooth. [Oenothera Nuttallii Sweet]. 



On prairies, Minnesota to Idaho and Texas. Spring and summer. 



10. KNEIFFIA Spach. 



Annual or perennial caulescent often shrubby herbs. Leaves alternate : blades 

 mostly narrow, entire or shallowly toothed. Buds erect. Flowers diurnal, in ter- 

 minal spikes or racemes. Sepals narrow. Corolla yellow. Ovary usually club-shaped, 

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

 oblong by the wings, 4-winged or rarely sharply 4-angled. Seeds not angled, without a 

 tubercle. SUNDROPS. 



Stem-leaves linear-filiform : capsules 4-angled or 4-margined. 1. K. linifolia. 



Stem-leaves with relatively broad blades : capsules winged. 



A. Capsules club-shaped, the body gradually narrowed into the pedicel-like 



base or essentially sessile. 



a. Petals over 15 mm. long : capsules pubescent. 

 Capsule-body less than twice as long as thick. 



Leaves silvery-strigose : capsules hirsute, the body stout-stalked. 2. K. arenicola. 



Leaves glabrous or minutely and inconspicuously pubescent : cap- 

 sules minutely appressed-pubescent, the body slender-stalked. 3. K. subglobosa. 

 Capsule-body over twice as long as thick. 



Body of the capsule shorter than the pedicel-like base. 4. K. longipedicellata. 



Body of the capsule longer than the pedicel-like base. 



Sepals less than 1.5cm. long, the tips united in the bud or if dis- 

 tinct less than 1 mm. long : corolla less than 4 cm. wide : cap- 

 sules mostly less than 1.5 cm. long. 

 Capsule-body and slender pedicel-like base clearly defined, the 



wings thin and commonly glabrous. 5. K. linearis. 



Capsule-body narrowed into a stout, little differentiated base, 



the wings thick and copiously pubescent. 6. K. Spachiana. 



Sepals over 1.5 cm. long, the tips distinct, 2.5-4 mm. long : corolla 



