ONAGRACEAE (EVENING PRIMROSE FAMILY) 599 



lanceolate, shorter than or scarcely exceeding the capsules; oalyx-tube 2.5-3.5 

 cm. long; petals yellow, obovate, 1.5-2.6 cm. long; pods more or less hirsute, 

 narrowed almost from the base, 2-3.5 cm. long, {finagra Scop.) — Open places, 

 common. 



0. grandifi,6ra Ait. (0. biennis, var. Lindl.; Onagra Cockerell), a related 

 species of Alabama, with much larger flowers, the petals 4-6 cm. long, was for- 

 merly cultivated and has on rare occasions been found, presumably as an escape, 

 \\ithin our range. 



6. 0. rhombipStala Nutt. Rarely branching, appressed-puberulent and sub- 

 canesoent ; leaves narrowly lanceolate, acuminate, denticulate or subentire, the 

 lowest attenuate to a petiole and rarely pinnatifid, diminishing upward into the 

 close elongated conspicuously bracted ,spike ; calyx silky-canescent, the tube 

 2-3.5 cm. long; petals rhombic-ovate, 1.2-2.5 cm. long. — Iiid. to Minn., Neb., 

 and Tex. 



7. 0. humifusa Nutt. Hoary with short dense oppressed hairs; stems de- 

 cumbent or ascending, 1.5-6 dm. long; stem-leaves narrowly lanceolate or ob- 

 lanceolate, 1-4 cm. long, sparingly repand-dentate or entire, the radical leaves 

 pinnatifid, the floral not reduced; petals 1.2-2.5 cm. long; capsule 2-3.5 cm. 

 long, silky ; seeds smoothish. — Sandy coast, N. J. to Fla. 



^ 8. 0. laciniUta Hill. Stems ascending or decumbent, simple or branched, 

 1-7 dm. high, more or less strigose-puhescent and puberulent ; leaves oblong or 

 lanceolate, 2-10 cm. long, sinuately toothed or often pinnatifid, the floral simi- 

 lar ; petals 5-12 m»n. long ; capsules 2-3 cm. long ; seeds strongly pitted. ( 0. 

 sinuata L.) — Dry open mostly sandy places, N. J. to Fla., Tex., and S. Dak. 

 also adventive northeastw. 



Var. grandifI6ra (Wats.) Robinson. Flowers larger; the petals 2.5-4 cm. 

 long. (0. sinuata, var. Wats.; 0. laciniata, var. grandis Britton.) — Common 

 in sandy fields, etc.. Mo. and Kan. to Tex. 



§ 2. AnOGRA (Spach) Endl. Stigma-lobes linear, elongated; flowers nodding 

 in the bud; seeds in a single row in each cell ; fruit subcylindric or pris~ 

 matie, elongated; caulescent perennials. Anogra Spach. 



9. 0. pdllida Lindl. Stems erect, 1.5-12 dm. high, commonly branched, 

 white and often shreddy, glabrous or puberulent ; leaves linear to oblong-ob- 

 lanceolate, 2.5-8 cm. long, entire or repand-denticulate, or sinuate-pinnatifld 

 toward the base ; calyx-tips free in bud, throat naked ; flowers axillary ; petals 

 white, turning rose-color, suborbicular, obcordate, 1.5-3 cm. long ; pods 2-5 cm. 

 long, often curved or twisted ; seeds lance-linear, smooth. ( 0. albicaulis Man. 

 ed. 6, not Nutt.; Anogra pallida Britton.) — Dry plains and prairies, Sask. to 

 w. Minn., westw. and soiithwestw. (Mex. ) 



§ 3. KNEfFFIA (Spach) Endl. Stigma-lobes linear, elongated; flowers yellow, 

 erect in the hud {the whole floral axis recurved in no. 11); fruit short, obo- 

 void, tetragonal; seeds clustered in each ceil, not in distinct rows, not 

 crested; caulescent. Kneifpia Spach. 



a. Pods 4-6 mm. long; calyx-tube about 2 mm. long; stem-leaves al- 

 most filiform W. O. li/nifoUa. 



a. Pods 5-12 mm. long : calyx-tube 7-15 mm. long ; stem-leaves linear 



to linear-oblong or ovate &. ^ 



b. Pods smooth to sparingly puberulent with spreading gland-tipped 

 hairs. 

 Petals 5-10 mm. long . . . . i . . . 11. O.pumila. 



Petals 1.4-3 cm. long. 

 Leaves ovate, glaucous, entirely glabrous ; capsule more than 



9 mm. long ' .... 12. 0. gla-uca. 



Leaves lance- to linear-oblong, pubescent or at least clliolate ; 



capsule usually less than 9 mm. long IS. O. fruticosa. 



&. Pods grayish-pubescent with fine incurved glandless hairs . . 14. 0. linearis. 

 b. Pods covered with copious widely spreading straight glandless hairs. 

 Stem, pedicels, calyx, etc., finely and softly puberulent ; sepaLs 

 wholly connivent or their free tips very short (1 mm. long 



or less) 15. O.lonQtpedicHlato. 



Stem, pedicels, calyx, ptc, coarsely hirsute ; tips of sepals free 



in bud, usually spreading, 2 mm. long , , , . . 16. 0. ^ratensis. 



