654 PRIMULACEAE 



flowers 10-20; calyx-tube 5-6 mm. long; lobes lanceolate, about 5 mm. long; 

 corolla bluish violet, paler in the throat, but without anj' markings; lobes oblong, 

 obtuse; anthers narrowly linear-lanceolate, acute, 7-8 mm. long; connective 

 narrow, lance-subulate; capsule about 12 mm. long, cylindric-ovoid, septicidal 

 from the apex. River valleys: Colo. — Wyo. Mont. Je-Jl. 



8. D. pulchrum Rydb. Leaves glabrous, obovate-eUiptic, 7-8 cm. long, 

 without distinct })etioles, thin, wavy, acute or obtuse; scape about 2 dm. high, 

 5-7-flowered; corolla rose or purplish, with a deep pur])le wavy line in the throat; 

 lobes about 2 cm. long, broadly oblong; anthers 6-7 nun. long, obtuse; connective 

 pm-ple, lanceolate, rugose at the base. Creek-banks: Yellowstone Park. Mont. 

 Je. 



9. D. pubescens Rydb. Leaves 2-4 cm. long, elliptic or broadly spatulate, 

 densely and finely pubescent, obtuse at the apex, abruptly contracted into short 

 petioles; scape about 1 dm. long, 2-5-flowered; calyx-lobes lanceolate, acute, 

 about 4 mm. long; corolla bluish purple; lobes linear-oblong, acutish, about 7 

 mm. long; anthers about 5 mm. long, acute; connective lanceolate, j'ellow, 

 rugose; capsule cylindric about 1 cm. long. Wet places: w Mont. Submont. 

 Ap. 



10. D. Hendersoni A. Gray. Leaves thick, 4-10 cm. long; blades orbicu- 

 lar, oval, broadly oval or obovate, entire or callous-denticulate, rounded at the 

 apex, abruptly contracted into short petioles; scape 2-3 dm. high, 6-12-flowered; 

 calyx-tube 4-5 mm. long; lobes lanceolate, acmninate, about 4 mm. long; corolla 

 with a dark indigo lobed center; outer part of the throat light-colored; lobes 

 oblong, obtuse, 15-20 mm. long, purple or lilac; anthers linear, 4-5 mm. long, 

 obtuse; capsule oblong, about 1 cm. long. Hillsides: B.C. — Calif. — Ida. Sub- 

 mont. Mr-My. 



11. D. acuminatum Rydb. Leaves 5-6 cm. long, rather fleshy, glabrous 

 or minutely puberulent; blades entire-margined, oblong-eUiptic, usually obtuse 

 at the apex, tapering into short petioles; scape 1-1.5 dm. high, 3-5-flowered; 

 calyx-lobes lanceolate; corolla whitish, tinged with purple or rose; lobes lance- 

 olate, 12-15 mm. long, acuminate; anthers 6-7 mm. long; connective purple, 

 broad and rugulose at the base. Wet open slopes: Mont. — Wyo. Submont. 

 Ap-Jl. 



12. D. philoscia A. Nels. Leaves 3-10 cm. long, rather thin, glabrous; 

 blades oval to oblong, obtuse or rounded at the apex, contracted into short 

 petioles; scape 1-2 dm. high, slender, 1-3-flowered (rarely 4-6-flowered) ; calyx- 

 tube about 2 mm. long; lobes lanceolate, 2-3 mm. long; corolla purple or violet, 

 usually with a dark wavy line in the throat; lobes linear-oblong or Unear, acute 

 or obtuse, 12-18 mm. long; anthers hnear, acute, about 6 mm. long; capsule 

 oblong, 8-10 mm. long. Gravelly margins of streams: Wyo. — Colo. Submont. 

 — Mont. Je-Au. 



13. D. radicatum Greene. Leaves 5-20 cm. long; blades oblanceolate, or 

 rarely elli])tic, entire-margined or (in the v. sinuatum) sinuate, obtuse or acutish 

 at the apex, tapering below into short petioles; scape 1-4 dm. high, 5-15 flowered; 

 calyx-tube 3-4 mm. long; lobes linear-lanceolate, about 6 mm. long; corolla 

 purple, with a very dark wavy line in the throat; lobes linear or oblong, obtuse, 

 15-18 mjn. long; anthers linear, acute, 5-6 mm. long; capsule oblong-ovoid, 

 about 12 mm. long. Wet meadows: S.D. — Kans. — N.M. — Wyo. Plain — 

 Mont. My-Jl. 



14. D. pauciflorum (Durand) Greene. Leaves glabrous, 3-10 cm. long; 

 blades oblanceolate, entire-margined, obtuse at the apex, tapering into more or 

 less elongate petioles; scape 1-4 dm. high, 1-10-flowered; calyx-tube 2 mm. 

 long; lobes lanceolate, about 4 mm. long; corolla purple, with a very dark wavy 

 line in the throat; anthers 4-5 mm. long, linear, usually obtuse; capsule elongate- 

 oblong, 12-15 mm. long. Wet meadows: Mack. — Sask. — Colo. — ^Wash. — B.C. 

 Plain — Mont. Je-Au. 



15. D. salinum A. Nels. Leaves 2-4 cm. long, spreading, glabrous; blades 

 elliptic or oblanceolate, rarely obovate, obtuse, thin, entire-margined, tapering 



