584 ONAGRACEAE 



c 



s 



^ 



".'■- 



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. 



Oviiles 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 imequal 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, cesmtose. 13. Lavauxia. 



Plants caulescent, with wiry diffuse stems. 



14. Gaurella. 



stigma discoid or capitate. 



Stigma discoid; hypanthium-tube funnelform above. 



Hypanthium-tube longer than the ovar> ; stigma entire. 



15. Galpinsia. 



Hj-panthium-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. Spiiaerostigma. 



Capsule more or less clavate, pedicelled and obtuse. 



^ .^ . ^ ,,. 19. Chylismia. 



Fruit mdehiscent, nub-like. 



Hypanthium-tube filiform; filaments unappcndaged ; ovary 1-celJed. 



^ ^ 20. STENOSIPHON. 



ii^-panthium-tube obconic; filaments wit!i scales at the base; ovary 4-celled. 



^, - 21. GAURA 



1^ lowers 2-merous; fruit indehiscent, obovoid and bristly with hooked hairs. 



22. CiRCAEA. 



1. CHAMAENERION 



Fire-weed. 



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

 entire. Flowers perfect, somewhat irregular, show>% in terminal racemes. 

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

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

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

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



Style pub^cent at the base; leaves lanceolate or linear-lanceolate, with the lateral vems 



confluent in marginal loops. 

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



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

 o+ , , , , , 2. C. spicatum. 



style glabrous; lateral vems of the leaves obsolete, not looped. 



J-,eaves lanceolate to ovate, entire or nearly so; pod about 3 mm. thick. 

 T _ , 3. C. latifolium, 



V i^eaves narrowly hnear-lanceolate, denticulate; pod about 2 mm. thick, 



i ■ 4. C. suMentatum. 



r 



•^j !• p- 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- 



5 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. Submmil. Je-Jl. 



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

 puberulent above; leaves lanceolate or Unear-Ianceolate, 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 annusti folium 3 L. C 



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

 — JN.O.— 111.— N.M.—CaUf.— Alaska. Suhmonl.—MonL Je-S. 



1 ^'j ^' J-^t^^'^i^V"^ ^^-^ Sweet. Perennial, with a cespitose rootstock; stem 

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



