178 PRIMULACEAE 



Calyx-tube in fruit hemispherical: teeth broadly triangular. 10. A. ftliformis. 



5. TRIENTALIS L. Stabflower. 



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. 



6. LYSIMACHIA (Tourn.) L. Loosestmpe. l. L. terrestris. 



7. STEIRONEMA Raf, Fringed Loosestrife. i. S. ciliatum. 



8. NAUMBtJRGIA Moench. Tufted Loosestrife. l. N. thyrsiflora. 



9. ANAGALLIS (Tourn.) L. Poor Man's or Shepherd's Weatherglass. 



Pimpernel. I. A. arvensis. 



10. CENTtJNCULUS L. False Pimpernel, Chaffwebd. i. C. minimus. 



11. GLAXJX (Tourn.) L. Black Saltwort, Sea Milkwort. 



1. G. marilima. 



12. DODECATHEON L. Shooting Star, American Cowslip, Bird-bills. 

 Anthers subsessile or nearly so; tube of the filaments if any less than 0.5 mm. long. 



Leaf-blades thin, ovate, sinuately dentate, truncate, subcordate or obtuse at the 



base; anthers strictly sessile. 1. D. dentalum. 



Leaf-blades thicker, linear, oblanceolate or oval, entire or minutely denticulate, 

 gradually tapering at the base. 

 Filaments purple; plant with a distinct, often bulblferous rootstock. 

 Leaf-blades linear or narrowly linear-oblanceolate, entire. 



Plant low; eorolla^lobes 10-18 mm. long. 2. D. alpirium. 



Plant tall; corolla-lobes 20-25 mm. long. 3. D. Jeffreyi. 



Leaf-blades broadly oblanceolate or elliptic; margins callous-denticulate. 



4. D. viviparum. 

 Filaments yellow; rootstock merely a short vertical crown, bearing the leaves and 



fleshy roots; bulblets none. 

 Leaves glabrous. 



Leaves distinctly petioled. 



Scape low, few-flowered; capsule circumscissile near the ape.^; con- 

 nective rugose. 

 Leaf-blades oval, elliptic, or obovate; capsule 10-12 mm. long. 



5. D. conjugens. 

 Leaf-blades oblanceolate or oblong, spatulate; capsule 15-20 mm. 



long. 6. D. cylindrocarpum. 



Scape taU, many-flowered; capsule opening by valves from the apex: 

 connective not rugose. 7. D. muUiflorum. 



Leaves subsessile. 8. D. pulchrum. 



Leaves pubescent. 9. D. pubescens. 



Anthers not subsessile; filaments united into a distinct tube, 1-3 mm. long. 

 Leaves glabrous. 



Capsule circumscissile near the apex; anthers more than twice as long as the tube 

 of the filaments. 

 Filaments and throat of the corolla indigo blue; leaf-blades obovate. 



10. D. Hendersoni. 

 Filaments and throat of the corolla yellow. 



Petals oblong-lanceolate, obtuse or acutish. 6. D. cylindrocarnum. 



Petals lanceolate, long-acuminate. 11. D. acuminatum. 



Capsule opening by valves from the apex. 



Anthers more than twice as long as the short filaments. 



Leaf-blades oval or oblong; bracts oblong, mostly obtuse; plant slender; 



flowers 1-3 (rarely 4-5). 12. D. philoscia. 



Leaf-blades oblanceolate; bracts lanceolate, acute; plant usually stout and 

 many-flowered. 13. D. radicatum. 



Anthers less than twice as long as the filaments. 

 Whole plant glabrous. 



Bracts lanceolate, acute; anthers 4-5 mm. long, half longer than the 



fllament-tube. 14. D. pauciflorum. 



Bracts oblong, obtuse; anthers 3-4 mm. long, only slightly longer than 

 the fllament-tube. 15. D. salinum. 



Bracts, upper part of the peduncle, and pedicels puberulent; bracts small, 

 lanceolate, acute ; anthers 3-4 mm. long. 16. D. puberutentum. 



Leaves pubescent. 



Plant 1-2 dm. high, usually more than one-flowered; leaves with long petioles. 



17. D. Cusickii. 

 Plant about 5 cm. high, usually 1-flowered; petioles obsolete. 18. D. uniflorum. 



13. SAMOLtTS (Tourn.) L. Water Pimpernel, Brookweed. 



1. S. floribundus. 



