19. HVI'ERICACEAE 77 



2. Sepals 5; petals 5 2. Hypericum 



1. Petals pink or greenish-purple, imbricate in the bud; sepals 5; hypogynous 

 glands 3; leaves oval 3. Triadenum 



1 . Ascyrum L. — St. Andrew's Cross 

 A. hyptricoidcs L. Wooded slopes or ridges, locally in southern 

 Illinois. July-Aug. [A. crux-andreae sensu autli., non L.; A. multicaule 

 Michx.]. 



2. Hypericum L. — St. John's- wort 

 1. Leaves with ordinary flat blades. 



2. Flowers large, the petals 0.8-2.5 cm long; stamens numerous. 

 3. Petals not at all black-dotted or streaked. 

 4. Styles 5; capsules 5-loculed. 



5. Capsules 2-2.5 cm long; flowers 4-5 cm in diameter; 

 stems herbaceous, 0.5-1.5 m tall; leaves lanceolate or 

 ovate-lanceolate, sessile, partly clasping; banks of 

 streams, locally nearly throughout 111. July-Aug. 

 Giant St. John's-wort. [H . ascyron of auth., non L.] 



H. pyramidatum Ait. 



5. Capsules 3-9 mm long; flowers 2-3 cm in diameter; 



shrubs to 1.5 m tall; leaves linear or oblanceolate or 



elliptical. 



6. Sepals 5-30 mm long; capsules 7-15 mm long; sandy 



or rocky soil, rare. Cook and Lake counties. June- 



Aug. Kalm's St. John's-wort H. kalmianum L. 



6. Sepals 2-5 mm long; capsules 3-7 mm long; low, wet 

 ground, rare; s. 111., Massac Co., /. R. Swaync 1 104 

 and 1163 in 1950. [H. densifloruru \ar. lobocar- 



piini (Gattinger) Svenson] 



H. lobocarpum Gattinger 



4. Styles 3 (rarely 4), free, or united into a beak. 



7. Capsules 10-13 mm long, 3-loculed; flowers 1.5-2 cm 

 in diameter; branched shrubs to 1 meter tall; moist 

 woods; principally in the s. half of the .state. July-Aug. 



Shioibby St. John's-wort H. prolificum L. 



7. Capsules 4-7 mm long; flowers 1-1.5 cm in diameter. 

 8. Capsules 3- to 4-loculed; stamens persistent, forming a 

 mass at base of capsule; wet ground, rare; St. Clair 



Co., Brendrl in 1850; Wabash Co., Schneck 



H. adpressum Bart. 



8. Capsules 1-loculed; stamens not persistent. 



9. Styles united below; stigmas elongate; plants not 

 virgate. 

 10. Stems somewhat woody at base; inflorescence 

 many-flowered; seeds rugulose and pitted; 

 roadsides, open woods, river banks, common 

 throughout 111. June-Aug. Round-fruited St. 

 John's-wort. [H. cistijolium sensu auth., non 

 Lam.] H. sphaerocarpum Mich.x. 



