584 ONAGRACEAE 



Fertile stamens 8; petals entire, rhombic. 9. PHAEOSTOMA. 



Anthers attached near the middle and versatile. 

 Stigma divided 'into 4 linear lobes. 



Stamens equal in length; capsule terete or round-angled. 



Ovules and seeds horizontal, inserted in 2 or rarely more rows, 



prismatic-angled; petals yellow. 10. OENOTHERA. 



Ovules and seeds ascending, in one row, not angled; buds droop- 

 ing; petals white or pink. 11. ANOGRA. 

 Stamens unequal in length, the alternate longer; capsule crested or 



winged ; plant acaulescent or low-stemmed. 

 Capsules with more or less distinct double crests on the angles; 



seed furrowed along the rap ho. 12. PACHYLOPHUS. 



Capsules winged or at least sharply angled on the angles. 

 Plants acaulescent, cesoitose. 13. LAVAUXIA. 



Pianos caulescent, with wiry diffuse stems. 



14. GAURELLA. 

 Stigma discoid or capitate. 



Stigma discoid; hypanthium-tube funnelform above. 



Hypanthium-tube longer than the ovary ; stigma entire. 



15. GALPINSIA. 

 Hypanthium-tube shorter than the ovary ; stigma 4-toothed. 



16. MERIOLIX. 

 Stigma capitate. 



Plant acaulescent; capsules 4-winged; hypanthium-tube tubular- 

 cylindric. 17. TARAXIA. 



Plant caulescent; capsules not winged; hypanthium-tube ob- 



conic or funnelform. 

 Capsule linear, sessile, narrowed above. 



18. SPHAEROSTIGMA. 

 Capsule more or less clavate, pedicelled and obtuse. 



19. CHYLISMIA. 

 Fruit indehiscent, nut-like. 



Hypanthium-tube filiform; filaments unappendaged ; ovary 1-celled. 



20. STENOSIPHON. 

 Hypanthium-tube obconic; filaments with scales at the base; ovary 4-celled. 



21. GAURA 

 Flowers 2-merous; fruit indehiscent, obovoid and bristly with hooked hairs. 



22. ClRCAEA. 



1. CHAMAENERION (Gesn.) Boehmer-Ludwig. FIRE-WEED. 



Perennial herbs, somewhat woody at the base. Leaves alternate, narrow, 

 entire. Flowers perfect, somewhat irregular, showy, in terminal racemes. 

 Hypanthium not prolonged beyond the ovary. Sepals 4, deciduous. Petals 

 4, purple, forming an oblique cross, entire. Stamens 8, with declined filaments. 

 Stigma 4-lobed. Capsule elongate, nearly linear, obtusely 4-angled, locu- 

 licidal. Seeds with a tuft of hairs (coma) at the upper end. 



Style pubescent at the base; leaves lanceolate or linear-lanceolate, with the lateral veins 



confluent in marginal loops. 



Petals 15-20 mm. long; stem-leaves usually obtuse at the base. 1. C. exaltatum. 



Petals 8-12 mm. (rarely 15 mm.) long; leaves all acute at the base. 



2. C. spicatum. 

 Style glabrous; lateral veins of the leaves obsolete, not looped. 



Leaves lanceolate to ovate, entire or nearly so; pod about 3 mm. thick. 



3. C. lalifolium. 

 Leaves narrowly linear-lanceolate, denticulate; pod about 2 mm. thick. 



4. C. subdentatum. 



1. C. exaltatum Rydb. Stem 1-3 m. high, glabrous or nearly so; leaves 

 linear-lanceolate, 1-2 dm. long, 2-3 cm. wide, shprt-petioled, minutely denticu- 

 late or entire, slightly paler beneath; lateral veins numerous, at almost right 

 angles to the midrib; petals purple, broadly obovate; styles exceeding the sta- 

 mens, bearded some distance above the base; capsule 5-8 cm. long, spreading. 

 Hillsides: Alaska Mont. Ida. Wash. Submont. Je-Jl. 



2. C. spicatum (Lam.) S. F. Gray. Stem 0.5-2.5 m. high, glabrate below, 

 puberulent above; leaves lanceolate or linear-lanceolate, 5-15 cm. long, paler 

 beneath; petals purple, rose-colored or rarely white; style exceeding the stamens, 

 hairy at the base; capsule 5-7.5 cm. long. Epilobium angustifolium $ L. C. 

 angustifolium Scop. Edges of woods and copses, burnt-over ground, etc. : GreenL 

 _N.C. 111. N.M. Calif. Alaska. Submont. Mont. Je-S. 



3. C. latifolium (L.) Sweet. Perennial, with a cespitose rootstock; stem 

 1-4 dm. high, glabrous below; leaves 2-5 cm. long, ovate or ovate-lanceolate, 

 pale; inflorescence usually short; petals 1.5-3 cm. long, rose-colored, pale purple, 



