432 PRIMULACE^E dodecatheon 



9 Anagallis Corolla completely rotate, 5-parted. 



10 Centunculus Corolla with a globular tube and 4-5-lobed limb, short- 

 er than the calyx. 



Tribe ii. Ovary connate at base with the base of the calyx. 



11 Samolus Leaves alternate : flowers 5-merous: corolla nearly cam- 

 panulate : capsule 5-valved at the apex. 



Tribe 1 Primulese Endl. Gen. 730. Ovary ivholly free: ovules 

 fixed by the middle amphitropous or half anatropous. 



§ Scapigerous or tufted. Flowers chiefly 5-merous, umbellate or 

 solitary: lobes of the corolla imbricated in bud. Capsule dehiscent 

 by valves sometimes obscurely so. 



% Stamens connivent in a cone around the style, monadelphous 



1 DODECATHEON L. Gen. n, 200. 



Low acaulescent perennial herbs with entire leaves and few or 

 numerous flowers in an umbel terminating a naked scape. Calyx 

 deeply 5-lobed, the lobes reflexed in flower, erect in fruit. Corolla 

 5-parted, with very short tube and dilated thickened throat, the 

 long and narrow divisions reflexed. Stamens inserted on the 

 throat of the corolla: filaments short and flat, monadelphous, but 

 separable in age. Style filiform, exserted: stigma small. Pla- 

 centa columnar, many-ovuled. 



* Filaments distinct. 



D. dentatum Hook. Fl. ii, 119. Glabrous throughout : leaves ovate, 

 the blade 2-4 inches long by 1-2 inches broad, irregularly dentate, usually 

 abruptly contracted below to a margined petiole nearly as long as the blade : 

 scapes 4-8 inches long, few-flowered: involncral bracts linear, acuminate: 

 calyx lobes triangular, acuminate, a line or more long: lobes of the corolla 

 white with two purple spots at the base of each, linear-oblong, obtuse, 4-6 

 lines long: filaments very short; anthers linear-lanceolate, 2-toothed at the 

 apex, brownish-red : capsule but little longer than the calyx, early opening 

 from the apex by valves : seeds flat. In wet places on the bluffs of the 

 Columbia river, and in Idaho. 



1). campestmm. Glabrous throughout: leaves oblong, obtuse or acu- 

 tish, 1-2 inches long, tapering below to a broad petiole: scapes 3-6 inches 

 high, 1-3-flowered: involucral bracts lanceolate, acuminate, 1-3 lines long: 

 pedicels 4-6 lines long : calyx-lobes lanceolate, acute, 2 lines long : lobes of 

 the corolla narrowly oblong, abruptly narrowed near the apex, 6-7 lines 

 long, a line or more broad, pink above, with blue centre and white base: 

 filaments very short, : anthers linear-oblong, obtuse, pink with dark pur- 

 ple base : capsule oblong, opening by persistent valves. In prairies on the 

 Klickitat hills, Klickitat Co. Washington. 



* * Filaments more or less joined together into a tube : 



■*- Capsule opening by an operculate tip. 



D. viviparnm Greene Eryth. iii, 38. " Rootstock stout, horizontal 

 or ascending short, simple or with a few branches, bearing coarse white 

 fibrous roots beneath, and rather large bulblets above: leaves 6-10 inches 

 long, oblong-lanceolate, tapenng to a winged petiole, acute or obtuse at 

 apex, the whole margin coarsely and regularly but not deeply crenate, 



