GENUS 9. 



EVENING-PRIMROSE FAMILY 



3. Anogra Nuttallii (Sweet) Spach. Nuttall's 

 Evening-Primrose. Fig. 3047. 



Oe. albicaulis Nutt. Fras. Cat. Name only. 1813. 



Oe. Nuttallii Sweet, Hort. Brit. Ed. 2, 199. 1830. 



A. Nuttalliana Spach, Ann. Sci. Nat. II. 4: 164. 1835. 



Perennial, erect, simple or branched, 6'-3 high, stems 

 white or pale, glabrous, rarely with a few scattered long 

 hairs, the bark often shreddy. Leaves linear, sessile or 

 the lowest petioled, finely appressed-pubescent beneath, gla- 

 brous above, entire or sparingly denticulate, i'-3i' long; 

 flowers axillary, white, turning pink, i'-ii' broad; seg- 

 ments of the calyx linear, the tips free in the bud, its 

 throat glabrous within ; petals nearly orbicular, entire or 

 emarginate; capsules linear, erect-ascending, i'-ii' long, 

 about \\" thick; seeds smooth. 



Prairies, Minnesota to Saskatchewan, British Columbia, Ne- 

 braska and Colorado. White shrubby evening primrose. Tune- 

 Aug. Included in the western A. pallida in our first edition. 



4. Anogra latifolia Rydb. Gray-leaved Evening- 

 Primrose. Fig. 3048. 



Oenothera pallida latifolia Rydb. Contr. U. S. Nat. Herb. 3 : 



159. 1895. 

 Anogra latifolia Rydb. Bull. Torr. Club 31 : 570. 1904. 



Perennial, often much branched, 2 high or less, the 

 stout branches canescent, ascending. Leaves lanceolate to 

 oblong, firm in texture, 2'-^' long, i'-ii' wide, acute, 

 sinuate-dentate, or sometimes nearly entire, ashy- 

 canescent on both sides; flowers axillary, white, turn- 

 ing pink, ii'-2' wide; calyx strigose without; tips of the 

 calyx-segments free in the bud ; calyx-throat glabrous 

 within; capsules linear, i'-2' long, widely spreading or 

 somewhat upcurved. 



Dry soil, Nebraska and Kansas to Utah and New Mexico. 

 June-Aug. 



10. KNEIFFIA Spach, Hist. Veg. 4: 373. 1835. 



Usually slender annual or perennial caulescent shrubby herbs. Leaves thinnish, mostly 

 narrow, entire or shallowly toothed ; buds mostly erect. Flowers yellow, diurnal, in ter- 

 mina>l spikes or racemes. Calyx-tube slender, dilated at the throat ; calyx-segments finally 

 reflexed, the tips united in the bud or nearly so. Petals 4, spreading. Stamens 8, the alter- 

 nate ones longer; filaments filiform; anthers linear. Ovary usually club-shaped, 4-angled; 

 united styles filiform; stigma 4-cleft; ovules numerous, on slender stalks, in many rows. 

 Capsules more or less club-shaped, nearly sessile or long-stalked, 4-winged or rarely sharply 

 4-angled. Seeds numerous, not angled, without a tubercle. [In honor of Prof. C. Kneiff, 

 of Strassburg, who wrote on cryptogamic botany.] 



About 12 species, mostly in temperate North America. Type: Kneiffia glauca (Michx.) Spach. 

 Stem-leaves filiform-linear; capsules 4-angled or very slightly 4-winged. i. K.linifolia. 



Stem-leaves never approaching filiform ; capsules prominently winged. 

 Capsules club-shaped. 



Pedicels and capsules pubescent. 



Stems decumbent, spreading. 2. K. Alleni. 



Stems erect or nearly so ; body of the capsule more or less elongated. 

 Capsule stalked. 



Pedicel longer than the body of the capsule, the wings thick and pubescent. 



3. K. longipedicellata. 

 Pedicels shorter than the body of the capsule, the wings thin and glabrous. 



4. K. linearis. 

 Capsule sessile. 



Hirsute; flowers ij4'- 2^3' wide. 

 Merely puberulent ; flowers i' wide or less. 

 Pedicels and capsules glabrous or glabrate. 

 Capsules oblong or nearly so. 



Plants not glaucous, usually pubescent ; capsules less than 4" long. 

 Plants somewhat glaucous, glabrous ; capsules more than 5" long. 



5. K. prat en sis. 



6. K. pumila. 



7. K. fruticosa. 



8. K. glauca. 



