Jones: Flora of Illinois, 121. Primulaceae 201 



rare. May-July. \^Vacciniu7n oxycoccus L.} Small Cranberry 



...O. palustris Pers. 



1. Leaves elliptical (broadest near the middle), obtuse; pedicels mostly lateral, 

 the bracts attached above the middle; fruit 1-2 cm. in diameter, longer 

 than broad, not spotted; bogs, n. 111. June-Aug. [K. macrocarpon Ait.] 

 Large Cranberry O. macrocarpus (Ait.) Pers. 



121. Primulaceae Vent. — Primrose Family 



1 . Lobes of the calyx and corolla erect or spreading, not reflexed. 

 2. Plants small scapose, acaulescent, terrestrial. 



3. Corolla-tube equalling or exceeding the calyx; plants perennial 1. PnTnula 



3. Corolla-tube shorter than the calyx; annuals 2. Androsace 



2. Plants with leafy stems. 



4. Plants aquatic; immersed leaves pectinate 3. Holtonia 



4. Plants not aquatic; leaves entire. 

 5. Leaves alternate. 



6. Flowers solitary, axillary, sessile; capsule circumscissile 4. Cenlunculus 



6. Flowers in axillary racemes; capsules opening by 5 valves 5. Samolus 



5. Leaves mostly opposite or whorled. 



7. Flowers white; leaves mostly near apex of stem 6. Trientalts 



7. Flowers yellow or scarlet; stems leafy. 



8. Flowers scarlet (rarely white); capsules circumscissile; plants annual 



7. Anagallis 



8. Flowers yellow; capsules dehiscent by valves; plants perennial 



8. Lys'ivnachla 



1. Corolla-lobes reflexed; stamens exserted, connivent, forming a cone; leaves all basal 

 9. Dodecalheon 



1. Primula L. — Primrose 



P. mistdssinka Michx. Limestone cliffs, Jo Daviess Co., rare. Apple River, 

 Pepoon 272, G. N. Jones & G. D. Fuller 16351. Corolla-lobes pale lavender, 

 the throat yellow. May-June. [P. mistassinica var. noveboracensis Fern.] 



2. Androsace L. 

 A. occidentalis Pursh. Sandy soil, local. April. 



3. HOTTONIA L. 



H. inflata Ell. American Featherfoil. In shallow water, s. 111., rare. June- 

 Aug. 



4. Centunculus L. — Chaffweed 



C. minimus L. Moist ground, chiefly in the w. and s. counties. May-Sept. 



5. Samolus L. — Brookweed 



5. parviflorus Raf. Wet soil, throughout III., except the n. counties. June- 

 Aug. [S. floribiindus HBK.; S. " pauctflorus" Deam] 



6. Trientalis L. — Star-flower 



T. borealis Raf. Woods and thickets, n.e. III.; known from Lake and Cook 

 counties. June-July. [T. americana Pursh] 



