572 



HYPERICACEAE (ST. JOHN'S- WORT FAMILY) 



a. Petals yellow (at most mottled or striped with red, purple, or black) 

 b. Styles 5 ; pods 5-celled. 



Tall herb ; flowers 4-6 cm. broad ; pods 2-3 cm. long 

 Slender shrub; flowers 1.5-3 cm. broad; pods 5-10 mm. long 

 b. Styles 3, rarely 4 ; pods 3(rarely 4)-celled c. 

 c. Stamens very numerous (more than 12) d. 

 d. Shrubs, 0.5-2 m. high. 



Pods 1-1.5 cm. long 



Pods 5-8 mm. long 



d. Herbs, at most slightly woody at base e. 



e. Stamens in 3-5 clusters ; petals marked with black dots 



or lines /. 

 /. Petals bearing black dots only on the margin. 



Flowers and leaves few, the latter 1.5-3 cm. broad 

 Flowers and leaves very numerous, the latter rarely 



1 cm. broad 



,/. Petals bearing several rows of black dots or lines. 



Leaves rounded at tip ; sepals blunt or acutish ; pods 



4-6 mm. long 



Leaves (at least the upper) narrowed to the tip ; sepals 



acuminate ; pods 6-8 mm. long .... 



e. Stamens obscurely if at all clustered ; petals without black 



dots g. 

 g. Stems herbaceous, from slender creeping freely stolonif- 



erous bases. 

 Leaves and linear-lanceolate acute firm sepals with 



revolute margins 



Leaves and oblanceolate or obovate thin foliaceous 



sepals plane 



g. Stems woody at base, or if herbaceous without slender 



stolons h. 



h. Steins freely branching, woody at base ; cymes leafy- 



bracted ; styles united below ; stigmas elongate i. 



i. Capsule thick-ovoid to subglobose, somewhat 3- 



angled, essentially 1-celled. 

 Sepals 6-13 mm. long ; corolla 1.5-2 cm. broad. 

 Sepals 6-10 mm. long, 2-5 mm. broad 

 Sepals variable, the larger 1-1.8 cm. long, 6-8 



mm. wide 



Sepals 3-5 mm. long; corolla 1-1.5 cm. broad 

 i. Capsule conic-subulate, distinctly 3-celled 

 h. Stems simple below the loosely forking essentially 

 naked inflorescence, herbaceous ; styles distinct ; 



stigmas capitate 



c. Stamens 5-12 j. 

 j. Stem simple or loosely branched ; leaves linear to ovate, 



spreading k. 

 Jc. Bracts of the inflorescence foliaceous, resembling reduced 



stem-leaves 



k. Ultimate bracts of the inflorescence setaceous to linear- 

 subulate. 

 Leaves orbicular, ovate-deltoid, or rounded-oblong, 



clasping. 

 Leaves ovate-oblong or short-elliptic, rounded at tip ; 



pod short-ellipsoid 



Leaves ovate-deltoid, acutish or blunt ; pod slender- 

 conical 



Leaves lanceolate to linear, merely sessile (if clasping 



with lance-attenuate outline). 

 Leaves lanceolate, chiefly 5-7-nerved at base 



Leaves linear. 1-3-nerved 



j. Stems fastigiately branched ; leaves scale-like or linear- 

 subulate, strongly ascending. 

 Leaves 6-20 mm. long; pods ovoid, slightly exceeding the 



calyx 



Leaves shorter, scale-like; pods lance-subulate, much 



exceeding the calyx 



a. Petals flesh-color or purplish. 



Leaves sessile or clasping 



Leaves narrowed to distinct petioles 



1. //. A Key r on. 

 8. //. Kalmianwm, 



6. If. prolificum. 



7. H. denxiflorum. 



2. H. graveolens. 

 8. II. perforatum, 



4. II. punctatum. 



5. H. pseudomaculatum. 



10. H. adprt 



14. //. elUpticum. 



11. H. dolabriform-e. 



12. H.Bi^eHii. 



13. H. cistifolium. 

 9. //. galioides. 



. 15. H. virgatum. 



16. H. boreale. 



IT. H. mutilum. 



18. //. gymnanthum. 



19. //. inajus. 



20. //. canadense. 



21. H. Drummondii. 



22. H. gentianoides. 



28. 77. virginicum. 

 24. //. petiolatum. 



1. R6SCYNA (Spach) Endl. Stamens very numerous, 5-adelphous; styles 

 5, united below, the stigmas capitate; pod 5-celled, the placentae turned far 

 back into the cells; perennial herb ; flowers very large. 



1. H. Ascyron L. (GREAT S.) Stems 5-15 dm. high ; branches 2-4-angled ; 

 leaves 4-9 cm. long, ovate-oblong, partly clasping ; petals narrowly obovate, 2.5 



