PRIMROSE FAMILY 177 



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

 verticlllate. 

 Staminodia wanting; filaments united at the base; flowers solitary 



or racemose. 6. Lysimachia. 



Staminodia present: filaments distinct. 



Flowers solitary; staminodia conspicuous; corolla-lobes broad. 



7. Steironema. 

 Flowers in shoit axillary spikes; staminodia tootli-like; corolla- 

 lobes long and hnear. 8. Naumburgia. 

 Capsule circumscissile; low depressed herbs. 



Corolla longer than the calvx; filaments pubescent, adnate to the base 



of the corolla. 9. Anagallis. 



Corolla shorter than the calyx; filaments glabrous, adnate to the corolla- 

 tube. 10. Centunculus. 

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



12. DODECATHEON. 



Corolla wanting; calj'x with 5 petaloid lobes; flowers solitary, sessile, axillary. 



11. Glaux. 

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

 plant leafy -stemmed. 13. Samolus. 



1. PRIMULA L. Primrose, Cowslip. 



Bracts of the involticres 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, obttise ; leaves thin. 



1. P. mislassinica. 

 Calvx at least two-thirds 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, thick, obtusish. 3. P. incana. 



Bracts linear-subulate, thin. 4. P. specuicola. 



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

 notched, or entire. 

 Plant less than 1 dm. high, 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. angustifolia. 



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. 



2. DOUGLASIA Lindl. Mountain Pink. 



Pedtmcles with several flowers in an umbel; leaves stellate-pruinose, not ciliate. 



1. D. nivalis. 

 Peduncles 1-3-flowered; leaves ciliolate on the margins. 2. D. montana. 



3. DROSACE A. Nels. 



Leaves without tliickened midrib, linear-oblanceolate, about 1 cm. long; pedicels much 

 longer than the calyx, nearly equalling the bracts. 1. D. atberiina. 



Leaves oblanceolate, about 5 mm. long, at least the old ones with the midrib thickened 

 on the imder side; pedicels shorter than the calyx. 2. D. carinata. 



4. ANDRdSACE (Tourn.) L. 



Calyx-tube in fruit obpyramidal, its green teeth surpa.ssing the capsule. 

 Bracts of the involucre ovate or oblong. 



Calyx-teeth longer than the tube; leaves linear-oblanceolate, thin. 



1. .4. arizonica. 

 Calyx-teeth shorter than the tube; leaves spatulate or oblanceol.ate, thicker. 

 Scapes and pedicels several, diffuse or ascendmg. 2. .4. occidentalis. 



Scape single, 1-4-flowered, erect; pedicels almost erect. 3. A. simplex. 

 Bracts of the involucre lanceolate or subulate. 



Calyx-teeth erect, lanceolate, usually shorter than the tube. 



Pedmicles, pedicels and calyx-lobes densely puberulent, the latter exceeding 



the fruit. 4. .4. puherulenta. 



Pedimcles and pedicels sparingly puberulent or glabrous; calyx-lobes glabrous 

 or nearly so. not exceeding the fruit. 

 Corolla longer than the calyx. 



Peduncles 1-2 dm. high, many times longer than the strongly ascending 

 or suberect pedicels. 

 Cal.vx-lobes triangular, less than half as long as the calyx-tube. 



5. A. septcntrionalis. 

 Calyx-lobas lanceolate, more than half as long as the calyx-tube. 



6. A. pinelorum. 

 Pedimcles less than 3 era. high, often equalled or exceeded in length liy 



the spreading pedicels. 7. A. subumbellala. 



Corolla shorter than the calyx. S. .-1. diffusa. 



Calyx-teeth more or less spreading, ovate-triangular, foiiaceous, equallina: or ex- 

 ceeding the whitish tube; corolla shorter than the calj'x. 9. .4. subulifera. 



