EVENING PRIMROSE FAMILY 163 



Petals 2; fruit a small 1-seeded bur 1. Circaea. 



Petals 4; fruit nearly globose, nut-like 2. Heterogaura, 



Petals 4; fruit a linear or oblong capsule. 

 Seeds with a tuft of long hairs at apex. 



Flowers white, purple, or pink 3. Epilobium. 



Flowers (including calyx) scarlet, large 4. Zauschneria. 



Seeds naked at apex. 



Flowers white or pinkish, ^ in. or less long 5. Gayophytum. 



Flowers yellow 6. Oenothera. 



Flowers purple. 



Calyx-lobes reflexed or the tips united and turned to 

 one side. 



Petals sessile 7. Godetia. 



Petals distinctly clawed 8. Clarkia. 



Calyx-lobes erect; petals lobed 9. Boisduvalia. 



1. CIRCAEA. Enchanter's Nightshade. 



1. C. pacifica A. & M. Leaves very thin, ovate, obtuse or 

 heart-shaped at base, acute, wavy- 

 toothed to nearly entire, 1 to 3 in. 

 long, on petioles y 2 to l l / 2 in. long. 

 Flowers minute, white, in bractless 

 racemes. Calyx white. Petals 2. 

 Stamens 2. Fruit a one-seeded mi- 

 nute bur. 



This delicate, erect plant is an in- 

 habitant of moist, shady dells and is 

 so attractive that anyone who finds 

 it may consider himself fortunate. 

 It grows in the Merced Grove, in 

 bogs near the Happy Isles, at the 

 Iron Spring in Yosemite, and may be expected in similar 

 places where the altitude is not too great. 



2. HETEROGAURA. 

 1. H. californica Rothr. Leaves thin, ovate-lanceolate, 

 nearly or quite entire, 1 or 2 in. long, on petioles ^ to ^ in. 

 long. Flowers small, purple, short-pediceled in loose terminal 

 racemes. Petals with claws. Ovary 4-celled, maturing into 

 a nearly globose nut-like fruit not J /% in. thick. — Shady banks 

 in Hetch Hetchy and other low valleys. 



3. EPILOBIUM. Willow-herb. 

 Herbs with nearly sessile leaves and purple pink or white 

 flowers in racemes. Calyx-tube little prolonged beyond the 

 ovary, the 4 spreading lobes deciduous. Capsule linear, 4- 

 sided, 4-celled. Seeds numerous. 



