584 ONAGRACEAE 



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



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 raphe. 12. Pachylophus. 



Capsules winged or at least sharply angled on the angles. 

 Plants acaulescent, cesDitose. 13. Lavatjxi.\. 



Plants caulescent, with wiry dififuse stems. 



14. Gaurella. 

 Stigma discoid or capitate. 



Stigma discoid: hypanthium-tube funnelform above. 



HjT)anthium-tube longer than the ovarj ; stigma entire. 



1.5. Galpinsia. 

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



16. Meriolex. 

 Stigma capitate. 



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



cylindric. 17. T.\R.\XIA. 



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

 conic or funnelform. 

 Capsule linear, sessile, narrowed above. 



18. Sphaerostigma. 

 Capsule more or less clavate, pediceUed and obtuse. 



19. Chylismia. 

 Friiit 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 

 Flqwers 2-merous; fruit indeliiscent, obovoid and bristly with hooked hairs. 



22. CracAEA. 



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. exaUatum. 



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



2. C. sfjicatum. 

 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. latifolium. 

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



4. C. subdenlatum. 



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

 linear-lanceolate, 1-2 dm. long, 2-3 cm. wide, short-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 Unear-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. Epilohiimi anguslifolium ^ L. C. 

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

 —iNT.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. 



