PRIMROSE FAMILY 647 



Scapose annuals; capsule many-seeded. 4. Androsace. 



Corolla rotate, its lobes convolute or involute in bud; stamens exserted; plants 

 leafy-stemmed. 

 Capsule oi)ening lengthwise; erect plants. 



Flowers mostly 7-merous; corolla wliite; proper leavi;s clu.stered near 



the top of the stem, the lower ones reduced. 5. Trientalis. 



Flowers mostly 5-merous; leaves scattered on the stem, opposite or 

 verticillate. 

 Staminodia wanting; filaments united at the base; flowers solitary 



or rai-iTUose. 6. Lysimachia. 



StaiiiinoiHa ])resent; filaments distinct. 



Flowers solitary; staminodia conspicuous; corolla-lobes broad. 



7. STEIHONEMA. 



Flowers in short axillary spikes; staminodia tooth-like; corolla- 

 lobes long and Linear. 8. Naumbukgl^. 

 Capsule circumscissile; low depressed herbs. 



CoroUa longer than the calyx; filaments pubescent, adnate to the base 



of the corolla. 9. Anagallis. 



CoroUa shorter than the calyx ; filaments glabroits, adnate to the coroUa- 

 tube. 10. Centunculus. 



Corolla-lobes reflexed; stamens more or less monadelphous; plants scapose. 



12. Dodecatheon. 

 Corolla wanting; calyx with 5 petaloid lobes; flowers soUtary, sessile, axillary. 



11. Gi,.\ux. 

 Ovary partly inferior, the lower portion included in and adnate to the hypanthium; 

 plant leafy-stemmed. 13. Samolus. 



1. PRIMULA L. Primrose, Cowslip. 



Perennial scapose herbs. Leaves all in a basal rosette. Flowers in ours 

 umbellate. Calyx tubular, campanulate or funnelform, persistent, usually 

 angled, 5-lobed, the lobes imbricate. Corolla salver-shaped or trumpet-shaped, 

 with a funnelform throat, the tube longer than or equalling the calyx. Stamens 

 5, distinct, inserted in the tube or the throat of the corolla. Style filiform; 

 stigma capitate. Capsule 1-celled, 5-valved at the apex, many-seeded. 



Bracts of the involucres more or less gibbous at the base; lobes of the corolla deeply 2- 

 cleft. 

 Plant usually less than 1 dm. high, rarely mealy. 



Calyx about one-half as long as the corolla-tube; lobes oblong, obtuse; leaves thin. 



1. P. 77}istassinica. 

 Calyx at least two-tliirds as long as the corolla-tube; lobes acutish; leaves rather 

 thick. 2. P. MacCalliana. 



Plant taller, 1-4 dm. high, usually more or less mealy; leaves oblong or oblong-spatu- 

 late. 

 Bracts lanceolate, tliick, obtusish. 3. P. incana. 



Bracts linear-subulate, thm. 4. P. spccuicola. 



Bracts of the involucres not gibbous below; lobes of the corolla merely emargiuate or 

 notched, or entire. 

 Plant less than 1 dm. liigh, 1-few-flowered; flowers less than 2 cm. long. 



Scape usually 1-flowered, rarely 2-flowered; bracts subulate, small, less than 5 mm. 

 long. 5. P. angusti folia. 



Scapes 2-4-flowered; bracts conspicuous, oblong, more than 5 mm. long. 



6. P. Broadheadae. 

 Plant 1.5-5 dm. high, many-flowered; flowers more than 2 cm. long. 



7. P. Parryi. 



1. P. mistassinica Michx. Leaf-blades spatulate or obovate, denticulate 

 or repand, 1-3 cm. long, obtuse or rounded at the apex; scape 1-L5 dm. high, 

 slender; bracts subulate; calyx-lobes nearly as long as the tube; corolla pink or 

 pale purple; lobes of the limb usually 4-5 mm. long, obcordate. Wet banks: 

 Greenl. — Xev. — Minn. — Alta. Boreal. My-Jl. 



2. P. MacCalliana Wiegand. Leaf-blades broadly spatulate or obovate- 

 cuneate, rather thick, 1-2.5 cm. long, obtuse or rounded and crenate at the apex; 

 scape 5-12 cm. high; bracts subulate, 5 mm. long; corolla deep rich blue, with a 

 large orange eye; lobes 5-6 mm. long, broadly obcordate. Wet places in the 

 Rockies: Alta. — B.C. Mont. Je. 



3. P. incana M. E. Jones. Leaf-blades oblong or oblong-oblanceolate or 

 spatulate, 2-S cm. long, obtuse at the apex, sinuate-dentate or subentire, more 

 or less mealy beneath; scape 1-3 dm. high; bracts 6-10 mm. long; calyx 6-8 mm. 

 long, nearly equalling the corolla-tube, more or less mealy; lobes oblong, obtuse 

 or acutish; corolla lilac, 8-9 mm. long; lobes obcordate, 2-3 mm. long. P. amer- 



