190 ONAGRACEAE 



with apex exceedingly variable, from slightly to deeply retuse and bilobed; stamens subequal, 

 4-8 mm. long; stigma-lobes 1-1.5 mm. long, lavender; capsule rather short, 1-2.5 cm. long, 

 1.5-2 mm. thick, on pedicels 1-10 mm. long, beakless or short-beaked, 8-ribbed, terete, often ap- 

 pearing square when dry ; seeds 1 mm. long, dark brown, with minute cresting. 



Hillsides, Upper Sonoran Zone; Contra Costa County, and Butte County to Mariposa County, California. 

 Type locality: Nevada City, California. May-July. 



Godetia pacifica M. E. Peck, Proc. Biol. Soc. Wash. 47: 187. 1934. Slender, simple or branched, 1-4 dm. 

 high. Leaves few, entire, narrowly oblanceolate ; flowers few, remote; buds acute at apex; hypanthium 2 mm. long; 

 sepals coalescent in anthesis except at base and apex, and slit to expose petals; petals rhombic-ovate, 9-13 mm. 

 long pale rose-purple at tips, paler toward the base; capsule narrow-clavate, slightly curved, acutely 4-angled, 2-2.5 

 cm. long, on pedicels 1-3 mm. long. Near the sea, Lincoln County, Oregon. Type locality: Otter Crest, Lincoln 

 County. 



8. OENOTHERA L. Sp. PI. 346. 1753. 



Annual to perennial, caulescent or acaulescent herbs, with alternate or basal leaves. 

 Flowers in ours yellow or white, often aging reddish or purplish. Hypantb.ium prolonged 

 beyond the ovary, quite deciduous. Sepals 4, reflexed in anthesis. Petals 4. Stamens 8, 

 equal, or if unequal the opposite ones shorter ; anthers mostly versatile. Stigma varying 

 from being divided into 4 linear lobes, to discoid or capitate. Capsule membranous to 

 woody, straight to curved or coiled, 4-celled, 4-valved, dehiscent. Seeds many, naked. 

 [Name Greek, meaning wine-scenting, a name given to some now unknown plant, once 

 used for that purpose.] 



Genus of perhaps 200 species, mostly of the temperate regions and confined to the New World. Type species, 

 Oenothera biennis. L. 



Stigma with 4 linear lobes; flowers vespertine. 



Capsule terete or round-angled; plants usually with well-developed stems which bear leaves and flowers. 



Flowers yellow, the buds erect; seeds prismatic-angled, horizontal, in 2 rows in each cell. (Subgenus 

 Etiociiothera) 

 Petals 10-20 mm. long, not usually turning reddish in age. 



Sepals with free tips about 2 mm. long; plant grayish-strigose throughout. 



1. O. Ry doer git. 



Sepals with free tips 3 mm. or longer; plant finely pubescent and hirsute, the longer hairs from 

 reddish pustules. 2. O. biennis. 



Petals 25-40 mm. long, turning reddish in age. 3. O. Hookeri. 



Flowers white, the buds drooping; seeds cylindric to ovoid, not sharply angled, ascending, in 1 row in 

 each cell. (Subgenus Anogra) 

 Plants spring or winter annuals, coarse; basal leaf -blades rhombic, 2-8 cm. long; capsules woody, 

 with exfoliating epidermis, 2-7 cm. long; seeds 1.5-2 mm. long; buds often shaggy. 



4. O. delt aides. 



Plants perennial; basal leaves smaller and narrower; capsules not woody. 



Capsules often contorted; seeds linear-obovoid. 5. O. pallida. 



Capsules not contorted; seeds plump, ovoid. 6. O. calif arnica. 



Capsule crested or winged; plants usually acaulescent or nearly so, the leaves largely basal. 



Capsule tapering toward apex, not enlarged in upper half; seeds in 2 rows in each cell. (Subgenus 

 Pachylophis) 

 Flowers white; capsule oblong-ovoid, 2-3 cm. long, with low tubercles on the_ rounded angles; 

 seeds 3 mm. long, conspicuously furrowed along the raphe. 7. O. caespttosa. 



Flowers yellow; capsule attenuate toward apex. 



Capsule 3.5-6 cm. long, winged on angles along the lower half; seeds with broad flat open de- 

 pression along the raphe; plant of pine belt. 8. O. xylocarpa. 



Capsule 1.8-3.5 cm. long, not winged; seeds with narrow raphal groove; desert plants. 



9. O. prirmveris. 



Capsule enlarged in upper half, woody, winged especially above, 1-2 cm. long; flowers yellow; 

 seeds cuneate-obovoid. (Subgenus Lavauxia) 10. O. flava. 



Stigjna capitate; flowers diurnal. 



Hypanthium about 1 mm. long, orange and pubescent within and lined with a lobed disk; plants erect, annual, 

 2-10 dm. tall. (Subgenus Eulobus) H- O. leptocarpa. 



Hypanthium not lined with a lobed disk. 



Plants usually acaulescent; ovary fertile only in lower portion, gradually narrowed above into a per- 

 sistent sterile tubular filiform portion equaling or much exceeding the fertile part and simulating 

 an elongate hypanthium; flowers yellow. (Subgenus Taraxia) 

 Capsules broadly and truncately 4-winged, not over 1 cm. long; seeds obovoid; annuals. 



Flowers small, the petals 2.5-3 mm. long; sterile portion of the ovary 10-15 mm. long; epi- 

 dermis of stems exfoliating. 12. O. Palmert. 

 Flowers larger, the petals 8-12 mm. long; sterile portion of ovary 12-35 mm. long; epidermis 

 not readily exfoliating. 13. 0. gracihflora. 

 Capsules somewhat cylindrical, at most angled, not winged, attenuate gradually at tip into sterile 

 portion mostly over 1 cm. long; seeds not pointed at one end; perennials, acaulescent. 

 Leaves entire or with few teeth ; capsule glabrous. 



Plants glabrous to glabrate; sterile portion of mature ovary 2-6 cm. long; capsules oblong- 

 ovoid, S mm. or more thick; seeds 3 mm. long, distinctly minutely pitted. 



14. O. heterantha. 



Plants minutely pubescent, especially on veins and leaf-margins; sterile portion of ovary 

 5-12 cm. long; capsules linear, not over 3 mm. thick; seeds 2 mm. long, with a 

 scurfy surface. 15. O. ovata. 



Leaves deeply pinnatifid; capsule densely pubescent; sterile portion of ovary 25-80 mm. lo:ig; 

 capsules ovoid, straight. 16. O. tanacettfoha. 



