70 Flora of the Palonsc Region 



104. AGROSTEMMA. 



Annual pubescent herbs: leaves linear or linear-lanceolate, acute 

 or acuminate, sessile, flowers solitary at the ends of long axillary 

 peduncles, large, erect, red or white: calyx oblong, not inflated, 

 narrowed at the throat, 5-lobed, 10-nerved: petals 5, shorter than 

 the cal3 y x-lobes, not appendaged: stamens 10: styles 5, alternate 

 with the calyx-lobes: capsule 1 -celled; seeds numerous, black. 



A. githagO h- Annual or biennial, erect, branched above, 30-90 cm. tall, 

 the whole plant more or less pubescent with somewhat appressed hairs: 

 leaves linear, acute, 5-10 cm. long: flowers few on long peduncles: calyx- 

 teeth unequal, 2-3 cm. long, about equalling the tube: petals ovate, dull red, 

 minutely black-spotted. Sparingly introduced in grain fields. 



105. SILENE. 



Annual or perennial herbs: flowers clustered or solitary, mainly 

 pink, red or white: calyx more or less inflated, tubular, ovoid or 

 campanulate, 5-toothed, io r many-nerved: petals 5, narrow, clawed, 

 mostly crowned with a scale at the base of the blade: stamens 10: 

 styles 3, rarely 4 or 5, if 5 opposite the calyx-teeth: ovary 1 -celled 

 or incompletely 2-4-celled; ovules many: pod dehiscent by 6 or 

 rarely 3 apical teeth. 



Annuals. 



Stout, viscid, pubescent throughout. S. noctiflora. 



Slender, glabrous or puberulent with a portion of each internode sticky. 



S. ANTIRRHIXA. 



Perennials. 



Stems much branched, leafy. S. MENZIESII. 



Stems simple; upper leaves reduced. 



Merely puberulent. S. dougeasii. 



Pubescent, glandular above. S. SCOUEERi. 



S. antirrhina L. Annual, glabrous or puberulent: stem slender, mostly 

 simple, a portion of each internode sticky-viscid: leaves linear or lanceolate, 

 acute, 2-6 cm. long, sessile: flowers in a forked compound cyme, long ped- 

 icelled: calyx 10-nerved, ovate, cylindrical in fruit, 6-10 mm. long: petals 

 white or pinkish, notched, little exceeding the calyx. Sandy or gravelly 

 soil along Snake River. 



S. menziesii Hook. Perennial, glandular-puberulent: stems weak, erect 

 or decumbent, usually branched, 10-30 cm. high, leafy: leaves elliptic-lan- 

 ceolate, acuminate or acute at each end, 2-5 cm. long: flowers small, in 

 forked cymes: calyx obconical, 5-6 mm. long, 5-toothed, nerveless: petals 

 white, 2-cleft, 6-8 mm. long, usually without a crown. In woods and copses, 

 not rare. 



S. douglasii Hook. Perennial, tufted, minutely pubescent throughout: 

 flowering steins erect, 30-50 cm. tall, simple: leaves linear or linear-lanceo- 

 late, acute or acuminate, 5-8 cm. long: cymes few-flowered, long peduncled: 

 calyx oblong or obovoid, somewhat inflated, pale green, the nerves incon- 

 spicuous, 10-15 mm. long, the short teeth scarious-margined: petals white or 



