432 PRIMULACEAE dodecatheon 



9 Anagallis Corolla completely rotate, 5-parted. 



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



shorter than the calyx. 



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



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



panulate: capsvile 5-valved at the apex. 



Tribe 1 Primuleae Endl. Gen. 730. Ovary wholly 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 dehis- 

 cent 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 islade 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 : involucral bracts linear, acu- 

 minate : 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. 



D. campestrum. Glabrous throughout: leaves oblong, obtuse or acut- 

 ish, 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 

 purple 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. viviparum 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, tapering to a winged petiole, acute or obtuse at 

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

 with a callous point in each sinus, or the crenation reduced to the callous 



