ONAGRACE^E. (EVENING-PRIMROSE 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. 

 K Zauschneria. Calyx-tube continued much beyond the ovary, funnel-form. 



2. Epilobium. Calyx 4-parted 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. Oenothera* Calyx-tube produced beyond the ovary into a linear or obconical tube. 



Anthers all uniform. Petals without claws. 



w- -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 indehiscent, 1 to 4-seeded. Parts of the flower in fours, or rarely threes. 

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



t y 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 nei* 

 C the base. Ovary 4-celled. Leaves alternate. 



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

 | | 8. Circcea* Leaves opposite. 



*S 1. ZAUSCHNERIA, Presl. 



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

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

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

 JHCJapsule linear, obtusely 4-angled. — Low decumbent perennial, somewhat 

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

 oose spike. 



1. Z Californiea, 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. — Prom New Mexico to 

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



2. EPILOBIUM, L. Willow-Herb. 



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

 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. spicatum, Lam. Stem erect, simple, often i to 7 feet high: leaves 

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

 a lonq spicate raceme, bracteate, purplish-lilac : style hairy at the base, at first 

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



a 



