ONAGRACEiE. 



325 



late, strongly 8-ribbed, in fruit distended and the ribs less obvious; 

 capsule 2 lines long. 



Low lands along interior rivers: Cache Creek, Bolander; Lower 

 Sacramento Islands; San Joaquin lliver. 



2. A. humilis Michx. Smaller; leaves linear-oblanceolate, taper- 

 ing at base (not auricled) and sometimes short-petioled; flowers 1 to 

 3 in each axil; accessory teeth of the calyx sometimes as long as the 

 proper teeth; capsule dehiscent septicidally. 



Stockton. 



69. ONAGRACE>£. Evening-Primrose Family. 



Annual or perennial herbs with simple leaves sometimes lobed or 

 divided. Flowers complete, symmetrical, 4-merous (rarely 5 or 2- 

 merous), in spikes or racemes, or solitary. Calyx-tube adnate to the 

 ovary, the petals inserted at its summit, and the stamens twice as 

 many or as many. Pollen commonly cobwebby. Style always 

 single; lobes of the stigma as many as the cells of the ovary, or stigma 

 capitate. Capsule commonly 4, sometimes 5 or 2-celled. Seeds 

 mostly small, naked or with a tuft of hairs at apex (coma); endosperm 

 none. 



An order of showy plants with a large representation in western 

 America. Gayophytum with six species in California, approach* is 

 (Enothera; it has very small white or pink flowers and a 2-celled 

 ovary. The species are all very slender annuals and all beyond our 

 limits, mostly in the High Sierras. Heterogaura Californica Roth- 

 rock, which is allied to Clarkia, occurs in the Sierra Nevada from 

 Yuba Co. to Fort Tejon; it has 4 of the 8 stamens sterile and an 

 indehiscent fruit with one seed in each cell. 



Parts of the flower in 4's or 5's; fruit a capsule (indehiscent in no. 1). 

 Tube of the calyx not produced beyond the ovary, the limb divided down 

 to the ovary and persistent on it after flowering. 

 Petals 5,6 lines long or more; fruit at length reflexed . . 1. JUS8IXA* 



Petals none or minute; fruit erect 2. Lvdwigia. 



Tube of the calyx produced beyoud the ovary, the limb with the free por- 

 tion of the calyx-tube deciduous after flowering; parts of the flower 



always in 4's; ovary 4-celled. 

 Seeds with a tuft of hairs at one end. 



Flowers large; corolla and calyx scarlet 3. Zal'SCHNERIa. 



Flowers small; corolla white or purplish 4. Epilobium. 



Seeds naked. 



Flowers purple, rose-color or white, never yellow. 



Calyx-lobes erect or ascending; petals small or minute 



5. Boisdivalia. 



Calyx-lobes reflexed or the tips remaining united and turned to one 

 side in anthesis. 



Petals distinctly clawed, often much lobed, the stamens opposite 



them frequently wanting 6. Clarkia. 



Petals sessile, not lobed except in G. biloba; stamens always 8 . . . 



7. Godetia. 



Flowers yellow or (in two species) white 8. (Enothera. 



Parts of the flower in 2's; fruit bur-like 9. Circ.ea. 



1. JUSSI/EA L. 



Glabrous perennial herbs, ours riparian or of muddy shores. Leaves 



