ONAGEACE^E. (EVENING-PRIMKOSE FAMILY.) 101 



* Capsule loculicidal, many-seeded (the cells rarely only several-seeded). Parts of the 



flower in fours. 

 - Seeds comose at the apex : lower leaves often opposite : stamens 8. 



1. Zausehneria. Calyx-tube continued much beyond the ovary, funnel-form. 



2. Epilobium. Calyx 4-partecl nearly down to the ovary, or with a short and campanu- 



late tube beyond it. 



*- - Seeds not comose : leaves all alternate. 



H- Anthers attached near the middle and versatile : petals generally yellow or white or some- 

 times changing to rose-color. 



3. Gayophytum. Calyx-tube not produced beyond the ovary ; this and the membranous 



capsule only 2-celled. The stamens opposite the petals usually sterile. 



4. CEnothera. Calyx-tube produced beyond the ovary into a linear or obconical tube. 



Anthers all uniform. Petals without claws. 



H- -H- Anthers attached at or near the base, remaining erect ; those opposite the petals much 

 shorter, or sterile, or rarely wanting : petals never yellow. 



5. Clarkia. Calyx-tube above the ovary obconical ; its lobes reflexed. Petals with claws, 



either lobed or entire. Capsule coriaceous. 



* * Fruit dry and iridehiscent, 1 to 4-seeded. Parts of the flower in fours, or rarely threes. 



In ours the stamens are 8, and the anthers are attached by the middle. 

 G. Stenosiplion. Alternate stamens a little shorter. Ovary 1-celled. Leaves scattered. 



7. Gaura. Stamens nearly equal : filaments with a scale-like appendage on the inside next 



the base. Ovary 4-celled. Leaves alternate. 

 * * * Fruit indehiscent, bur-like, 1 to 2-seeded. Parts of the flower in twos throughout. 



8. Circeea. Leaves opposite. 



1. ZAUSCHNERIA, Presl. 



Calyx-tube deeply colored above the ovary, with a small globose base and 

 4-lobed limb, appendaged with 8 small scales, 4 erect and 4 deflexed. Petals 

 obcordate or 2-cleft, scarlet. Stamens exserted. Style long and exserted. 

 Capsule linear, obtusely 4-angled. Low decumbent perennial, somewhat 

 woody at base : leaves sessile : the large scarlet Fuchsia-like flowers in a 

 loose spike. 



1. Z. Calif ornica, Presl. More or less villous and often tomentose: 

 leaves narrowly lanceolate to ovate, entire or denticulate : capsule attenuate 

 to the slender base, sometimes shortly pedicellate. From New Mexico to 

 the Wahsatch and N. W. Wyoming, and thence to California. 



2. EPILOBIUM, L. WILLOW-HERB. 



The alternate stamens shorter : anthers fixed near the middle. Capsule 

 linear, 4-sided. Perennial or annual : leaves alternate or opposite, nearly 

 sessile, denticulate or entire, often fascicled : flowers rose-color, purple, or 

 white, very rarely yellow. 



* Flowers large : stamens and style declined : stigma-lobes spreading : leaves 



scattered. 



1. E. spicatuin, Lam. Stem erect, simple, often 4 to 7 feet high: leaves 

 lanceolate, sessile, nearly entire, the veins anastomosed near the edge : flowers in 

 a long spicate raceme, bracteate, purplish-lilac : style hairi/ at the base, at first 

 deflexed. E. angustifolium, L. Common across the continent. 



