ONAGRACEAE (EVENING PRIMROSE FAMILY) 599 



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

 cm. long ; petals yellow, obovate, 1.6-2.6 cm. long ; pods more or less hirsute, 

 narrowed almost from the base, 2-3.6 cm. long. (Onagra Scop.) Open places, 

 common. 



ii. (JKANDiKL^RA Ait. (0. bieiinis, 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, 

 within our ran ire. 



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

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

 lowest attenuate to a petiole and rarely pinnatifld, diminishing upward into tlie 

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

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

 and Tex. 



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

 cumbent or ascending, 1.5-(5 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 2-3.6 cm. 

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



8. 0. laciniata Hill. Stems ascending or decumbent, simple or branched, 

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

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

 lar ; petals 6-12 mm. long ; capsules 2-3 cm. long ; seeds strongly pitted. ( O. 

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

 also adventive northeastw. 



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

 long. (O. 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- 

 matic, elongated; caulescent perennials. AXOGRA Spach. 



9. 0. pallida 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-pinnatifid 

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

 white, turning rose-color, suborbicular, obcordate, 1.6-3 cm. long ; pods 2-5 cm. 

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

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

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



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

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

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

 crested; caulescent. KNEIFFIA Spach. 



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

 most filiform 10. 0. Unifolia. 



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



to linear-oblong or ovate b. 



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

 hairs. 



Petals 5-10 mm. long 11. 0. pumila. 



Petals 1.4-3 cm. long. 

 Leaves ovate, glaucous, entirely glabrous ; capsule more than 



9 mm. long 12. O. glauca. 



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



capsule usually less than 9 mm. long 18. O. fruticosa. 



b. Pods grayish-pubescent with fine incurved glandless hairs . . 14. O. linearis. 

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

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

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



or less) "..... 15. O. longiped icellata. 



Stem, pedicels, calyx, etc.. coarsely hirsute ; tips of sepals free 



in bud, usually spreading, 2 mm. long 16. O. pratensia. 



