Evening-primrose Family 269 



1. O. Hookeri (T. & G.) Small. Biennial; stem reddish, 

 stout, angular, 1-2 m. high, herbage canescently pubescent and 

 somewhat villous; leaves lanceolate, sessile, acute, obscurely 

 denticulate, calyx-tube 3 cm. long; the segments nearly as long; 

 petals about 4 cm. long, obcordate, pale yellow, turning to rose 

 color; stigma-lobes yellow, spreading; capsule 2 cm. long, ses- 

 sile, canescent with a fine close pubescence; seeds brown, 1 mm. 

 long, faintly striate, not wing-angled. (CEnothera biennis hirsu- 

 tissima Gray.) 



Frequent in moist ground, usually along streams, both in the valleys and 

 mountains. May-August. 



8. EULOBUS Nutt. 



A smooth erect annual with alternate leaves and 

 middle-sized flowers ; sessile along the virgate branches. 

 Calyx-tube scarcely at all produced beyond the ovary, 

 the limb 4-parted, reflexed. Petals 4, rhombic-ovate, 

 sessile, pale yellow turning reddish. Stamens 8 ; anthers 

 oblong, attached near the middle. Ovary 4-celled ; 

 stigma capitate. Capsule linear, elongated, 4-angled, 

 4-valved, imperfectly 4-celled, reflexed. Seeds numerous, 

 ovate-oblong, naked. 



1. E. Californicus Nutt. Stem 3-10 dm. high, rather stout, 

 simple or with a few spreading virgate branches ; leaves linear, 

 2.5-5 cm. long, sinuately pinnatifid, with numerous unequal 

 divaricate acute teeth; calyx-tube prolonged less than 1 mm. 

 above the ovary; petals 8-10 mm. long, pale yellow or nearly 

 white; capsule 6-10 mm. long; seeds 3-angled. 



Frequent in the chaparral belt throughout our range. 



9. SPHAEBOSTIGMA F. & M. 



Annual or perennial herbs with erect branching or 

 spreading stems, the bark often exfoliating and shiny. 

 Leaves alternate, entire or dentate, petioled or sessile. 

 Flowers solitary in the axils or in terminal spikes, usu- 

 ally yellow, rarely white or rose color, often with a 

 brownish spot at the base, turning green or reddish in 



