436 PRIMULACEAE trientalis 



STEIRONEMA 



§ § Leafy-stemmed. Leaves entire. Corolla rotate or some- 

 what so; the divisions convolute or sometimes involute in the hud, 

 wanting in Glaux. 



* Capsule mostly globose, dehiscent longitudinally by valves or 



irregularlv. 



5 TRIENTALIS L. Gen. n. 461. 



Low and glabrous perennial herbs with a simple stem, simple 

 leaves mostly clustered at the summit and white or pink flowers 

 on filiform pedicels. Flowers 5-7-merous, usually 6-merous. 

 Corolla completely rotate without a tube, deeply parted, the divi- 

 sions convolute in the bud. Filaments long and slender, united 

 at base into a short ring: anthers linear, recurving when old. 

 Style filiform. Capsule about 5-valved. Seeds few, rather large, 

 covered with a white cellular-reticulated pellicle, remaining for 

 some time fast on the placenta in a globular mass. 



T. latifolia Hook. Fl. ii, 121. Stem slender, 2-6 inches high from 

 a small subterranean tuber: bracts subulate to lanceolate: leaves from 

 lanceolate to ovate, usually abruptly acuminate, 1-3 inches long, narrowed 

 below to a short petiole : pedicels filiform shorter than the leaves : calyx- 

 lobes linear-lanceolate, acute or acuminate: corolla-lobes lanceolate, acu- 

 minate one-third longer than the calyx. Common in forests, California 

 to Vancouver Island. 



T. arctica Fischer in Hook. 1. c. T. Europaea var. arctica Ledeb. 

 Stem very slender, 1-4 inches high, with small scattered obovate leaves 

 below; upper leaves obovate-lanceolate to lanceolate, 6-12 lines long: ped- 

 cels filiform, longer than the leaves : lobes of the calyx linear, very acute, 

 2-3 lines long: lobes of the corolla lanceolate, acuminate and tipped with 

 a slender bristle, nearly twice as long as the calyx. In high mountain 

 marshes and along the coast, Oregon to Alaska and Behring Straits. 

 6 STEIRONEMA Raf. Ann. Gen. Phys. vii, 192. 



Leafy-stemmed perennial herbs with opposite or verticillate 

 simple leaves aiid axillary yellow flowers nodding on slender 

 pedicels. Flowers 5-merous. Corolla rotate with no proper tube, 

 deeply 5-parted, the sinuses rounded; the divisions ovate, cuspi- 

 date-pointed, each separately i'tiyolute or convolute around its 

 stamen. Stamens 5, alternating with 5 sterile filaments ; distinct 

 or nearly so, inserted on a ring at the base of the corolla. Capsule 

 10-20-seeded. 



S. ciliatum Raf. 1. c. Glabrous throughout except the petioles: 

 stems erect, 2-4 feet high, mostly simple: leaves ovate-lanceolate to ob- 

 long-ovate, gradually acuminate, 2-5 inches long, mostly with rounded or 

 subcordate base, minutely ciliate. membranaceous, pinnately veined; their 

 long petioles hirsutely ciliate : calyx-lobes linear-lanceolate, acuminate : 

 lobes of the corolla obovate, obtuse, nearly twice as long as the calyx, 

 erose-denticulate, 4-6 lines long: capsule longer than the calyx. Low 

 grounds, Oregon to Brit. Columbia and across the Continent. 



S. laevigatum. Stems slender, 1-3 feet high, white and smooth, pan- 

 iculately branched. above: leaves lanceolate to linear-lanceolate, all petio- 

 late, not at all ciliate except a few hairs at the base of the clasping peti- 



