PRIMROSE FAMILY 653 



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



Cajjsule 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; 



flowere 1-3 rarely 4-5;. 12. D. philoscia. 



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

 many-flowered. 13. D. Tadicalitm. 



Anthers less than twice as long as the filamoits. 

 Whole plant glabrous. 



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



filament-ttibe. 14. D. paudfloTUTn. 



Bracts oblong, obtuse; anth^^ 3—4 mm. IcHig, only slightly longer than 

 the filament-tube. 15. D. salxnum. 



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

 lanceolate, acute; anthos 3—4 mm. long. 16. D. puberulenlum. 



Leaves pubescent. 



Plant 1-2 dm. high, usually m<H« than one-flowered; lear^ with long petioles. 



17. D. Cusickii. 

 Plant about 5 cm. high., usually l-flowered;i>etiolesobsc*rtie. 18. D. uniflorum. 



1. D. dentatum. Hook. Leaves with winged petioles, 3-10 cm. long: 

 blades elongn:-. vate, sinuate-dentate, obtuse, 3^10 cm. long, ven* thin, gla- 

 brous: scape 2-3 dm. high, few-flowered: cah-x-tube about 5 mm. long, glabrous: 

 lobes lanceolate, acuminate, about 4 mm. long: corolla white: lobes oblong, ob^ 

 tuse, 8-10 mm. long: anthers about 5 mm. long, tapering upwards, but obtuse: 

 connective purple, smooth; capsule oblong, about 1 cm. long, opening by valves 

 from the ai>ex. D. Meadia lalil<jbum A. Grav. Rich wet soil in woods: Ore. — 

 Utah— Ida.— B.C. Je-JL 



2. D. alpinum (A. Gray) Greene. Leaves linear-oblanceolate, 3-15 cm. 

 long. .5-10 nrti. v.-ide, glabrous, obtuse at the ai>ex, entire; scape 1-3 dm. high, 

 usually few-flowered; cal>-s-tube 2 mm. long: lobes lanceolate, acute, 3-4 mm. 

 long: corolla bltiish purple: lobes lanceolate, 10-18 mm. long; anthers linear, 

 about 7 mm. long: connective purple, smooth: capsule oblong-eUijjsoid, about 

 7 mm. long, oj)ening by valves from the summit. Mountain valleys: Calif. — 

 L'tah. Submoni. — Mont. Je-Au. 



3. D. Jeffrey! Moore. Leaves linear or linear-oblanceolate, 1-2 dm. long, 

 1-2 cm. ^^-ide, glabrous, acutish, entire: scape 2—4 dm. high, several-flowered: 

 cah'x-tube 4-5 mm. long: lobes lanceolate, acute: corolla bluish purple: lobes 

 2-2.5 cm. long, lanceolate; anthers about 1 cm. long: connective smooth, purrle: 

 capsule opening by valves from the summit. ? D. dispar A. Xels. Mountain 

 valleys: Calif. — Ida. — B.C. Submont. — Mont. Je-Au. 



4. D. viviparum Greene. Leaves oblong to oblanceolate, 6-15 cm. long, 

 acute or obtlL^e, sinuately toothed: scape l.o^ dm. high; calyx-tube 3-4 mm. 

 long; lobes lanceolate, acute or acuminate; corolla purple; lobes linear, 1-2 cm. 

 long, acute or obtuse: anthers linear, 7-9 mm. long: connective narrow, purple: 

 capstile circiunscissile near the apex and later sphtting, ovoid, about 1 cm. long. 

 D. crenaium Greene. Wet places in the mountains: .Alaska — ^Mont. — Ore. 

 Submont. — Mont. Jl— Au. 



5. D. conjugens Greene. Leaves glabrous, oval, eUiptic, or rarely obovate, 

 1.5-4 cm. long, 1-2 cm. wide, rounded at the apex, abruptly contracted at the 

 base; scape 1-2 dm. high, 1— t-flowered; cal>'x-tube 4 mm. long; lobes lanceolate, 

 acute, about 5 mm. long; corolla from deep purple to rose or white; lobes linear, 

 acute, 15-18 mm. long; anthers 7-8 mm. long, mostly obtuse; connective broad, 

 lanceolate, white, rugose; capside oblong, 10-12 mm. long, circumscissile near 

 the apex. M-i-^t plsces: Ore. — Wyo. — ^font. Submoni. — Mont. Ap. 



6. D. cylindrocarpuin Rydb. Leaf-blades oblanceolate, or oblong-sp>atu- 

 late, glabrous, 4—10 cm. long, i-2 cm. wide, obtuse at the apex, gradually taper- 

 ing below: scape 1-2 dm. high, glabrous: c-al^-x-tube 3— i mm. long; lobes 3—4 mm. 

 long; coroUa purple or white; lobes linear to lanceolate, 1-2 cm. long: anthers 

 5-7 mm. long, usually acute: connective lanceolate, white, rugose: capsule 15-20 

 mm. long, circumscissile near the apex. D. albidum Greene. Wet places: e 

 Wash. — Mont. Mont. My. 



7. D. multiflonim Rydb. Leaves about 2 dm. long, sinuate-denticulate, 

 obtusish, narrowly oblanceolate, tapering below; scape stout, 3—4 dm. high; 



