Voi,. II.] 



EVENING-PRIMROSE FAMILY. 



489 



White-stemmed Evening- Primrose. 



3. Anogra pallida (L,indl.) Britton. 

 (Fig. 2586.) 



OE. aldtcaults'Nutt.FTSLS.Ca.t. Name only. 1813. 

 OE. pallida Lindl. Bot. Reg. 14: pi. 1142. 1828. 

 Anogra pallida Britton, Mem. Torr. Club, 5: 



234. 1894. 



Erect, simple or branched, 6'-4 high, 

 stems white or pale, glabrous or puberulent, 

 rarely with a few scattered long hairs, the 

 bark often shreddy. Leaves linear or ob- 

 long linear, sessile or the lowest petioled, 

 finely appressed-pubescent or glabrate, en- 

 tire, repand or somewhat pinnatifid, I'-sK' 

 long; flowers axillary, white, turning pink, 

 I'-i)^' broad; segments of the calyx linear, 

 the tips free in the bud, its throat glabrous 

 within; petals nearly orbicular, entire or 

 emarginate; capsule linear, curved, i / -2 / 

 long, about ij^" thick; seeds smooth. 



Prairies, Minnesota to British Columbia, Ne- 

 braska, Mexico and California. May-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 erect. Flowers perfect, yellow, diurnal, in ter- 

 minal 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 10 species, mostly in temperate North America. 



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; body of the capsule becoming subglobose. 2. K. Alleni. 

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



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



3. K. longipedicellata. 

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



4. K. linearis. 

 Pedicels and capsules glabrous or glabrate. 5. K. pumila. 



Capsules oblong or nearly so. 



Plants not glaucous, usually pubescent; capsules less than 4" long. 6. K. fruticosa. 

 Plants somewhat glaucous, glabrous; capsules more than 5" long. 7. K. glauca. 



i. Kneiffia linifdlia (Nutt.) Spach. 

 Thread-leaved Sundrops. (Fig. 2587.) 



OEnothera linifolia Nutt. Journ. Acad. Phila. 



2: i2p. 1821. 

 Kneiffia linifolia Spach, Nouv. Ann. Mus. Par. 



4: 368. 1835. 



Erect, very slender, simple or branched, 

 6'-i8' high, glabrous or nearly so below, 

 finely pubescent above. Stem-leaves filiform- 

 linear, entire, crowded, 6 // -i5 // long; basal 

 leaves tufted, oblanceolate or spatulate, peti- 

 oled, about i' long; flowers in loose spike-like 

 racemes, yellow, diurnal, 3 // -4 // broad; calyx- 

 lobes short, reflexed, the tube rather shorter 

 than the ovary ; stigma-lobes very short; 

 capsule obovoid, sessile or very nearly so, 

 puberulent, sharply 4-sided but not winged, 

 2 //_ 3 // long. 



In dry soil, Illinois to Kansas, south to Geor- 

 gia, Louisiana and Texas. May-July. 



