650 PRIMULACEAE 



white, about equalling the calyx. Hills and mountains: Yukon Sask. N.M. 

 Ariz . Plain Submont . 



6. A. septentrionalis L. Leaves oblanceolate or oblong, acute, dentate or 

 entire, rather thick, 1-2 cm. long; scapes 1-2 dm. high, slightly puberulent; 

 bracts subulate, 3-4 mm. long; calyx-lobes triangular, scarcely 1 mm. long, gla- 

 brous or nearly so; corolla about 4 mm. long, exceeding the calyx. Sandy plains 

 and banks : Hudson Bay Alta. Wyo. Ida. Alaska; Eurasia. Boreal. My- 

 Je. 



6. A. pinetorum Greene. Closely resembling the preceding and scarcely 

 distinct; scapes more numerous, 11.5 dm. high; calyx-lobes longer and narrower, 

 sometimes 1.5 mm. long. Pine woods: Colo. N.M. Submont. Subalp. My 

 Jl. 



7. A. subumbellata (A. Nels.) Small. Leaves oblanceolate, acute, thin, 

 entire or denticulate, puberulent, 1-2 cm. long; bracts subulate, 2-3 mm. long; 

 pedicels 1-5 cm. long; calyx-lobes lanceolate, scarcely 1 mm. long; corolla nearly 

 4 mm. long, slightly exceeding the calyx. Mountains, especially in gravelly soil: 

 Hudson Bay Colo. Ariz. B.C. Submont. Subalp. Jl-S. 



8. A. diffusa Small. Leaves oblanceolate, acute, entire or denticulate, 

 puberulent; scapes many, ascending, 3-15 cm. high; bracts subulate, 2-3 mm. 

 long; pedicels glabrous, spreading, 2-7 cm. long; calyx-lobes lanceolate, nearly 1 

 mm. long; corolla scarcely 3 mm. long, shorter than the calyx. A. elongata 

 Richards., not L. Hills and plains: Mack. N.M. Ariz. B.C. Submont. 

 Mont. My-Jl. 



9. A. subulifera (A. Gray) Rydb. Leaves oblanceolate, thin, acute, puber- 

 ulent, usually dentate, acute at the apex, 1-4 cm. long; scapes several, 5-15 cm. 

 long, slightly puberulent or glabrous; bracts subulate, 2-7 mm. long; pedicels 3 

 10 cm. long, spreading; calyx-lobes 1-3 mm. long, more or less foliaceous; corolla 

 shorter than the calyx. A. septentrionalis subulifera A. Gray. Canons and 

 valleys: Alta. Colo. Plain Mont. Je-Au. 



10. A. filiformis Retz. Leaves ovate-lanceolate or spatulate, 5-15 mm. 

 long, thin, usually dentate, glabrous; scapes several, 2-10 cm. high, filiform; 

 bracts subulate, 1-2 mm. long; pedicels 1-3 cm. long, spreading; calyx-tube 

 about 1 mm. long, in fruit almost hemispheric; corolla slightly exceeding the 

 calyx. A. capillaris Greene. Sandy or gravelly river shores or in mud: Wash. 

 Colo. Mont.; Asia. Submont. Subalp. Je-Au. 



5. TRIENTALIS L. STARFLOWER. 



Low perennial herbs, with rootstocks and simple stems. Leaves mostly 

 clustered at the end of the stem, the lower leaves being much reduced or even 

 scale-like. Flowers in the upper axils, with filiform pedicels. Sepals mostly 7, 

 nearly distinct, linear, imbricate. Corolla white or pinkish, rotate, deeply 5-7- 

 parted to near the base, with convolute lobes. Stamens mostly 7; filaments 

 long and slender, slightly united into a ring at the base. Style filiform. Cap- 

 sule with about 5 revolute valves. Seeds few. 



Lower reduced leaves lanceolate to linear-subulate, acute, scale-like. 



Verticillate leaves lanceolate, long-acuminate. 1. T. americana. 



Verticillate leaves broadly oval or obovate, acute or abruptly acuminate. 



2. T. latifolia. 

 Lower reduced stem-leaves oblanceolate or spatulate, obtuse. 3. T. arctica. 



1. T. americana Pursh. Stem 1-2.5 dm. high, naked below or with a few 

 scale-like lanceolate leaves, at the summit with a verticil of 5-10 short-petioled 

 or sessile leaves; blades 3-10 cm. long, thin, entire-margined or minutely crenu- 

 late; corolla 8-12 mm. wide; lobes ovate or lanceolate, acuminate. Damp 

 woods and thickets: Lab. Va. 111. Sask. Boreal. My-Je. 



2. T. latifolia Hook. Stem 0.5-2 dm. high, with a few scales below and a 

 verticil of 4-7 short-petioled or subsessile leaves at the summit; blades 3-7 cm. 

 long; corolla white or pinkish, 10-15 mm. wide; lobes ovate or lanceolate, abruptly 

 acuminate. Woods: B.C. Calif. Ida. Submont. Mr-My. 



