672 Hypericaceae Hypericum 



Styles 3 (rarely 4) ; capsules 3- (rarely 4-) celled, or incompletely 3-celled in H. 

 frondosum. 

 Stamens numerous, 15-40; flowers mostly 7-25 mm wide (except in H. majus). 

 Shrubs 0.5-2 m high. 



Sepals foliaceous, very unequal, more than 6 mm long; flowers mostly 3-5 cm 



wide 3. H. frondosum. 



Sepals not foliaceous; flowers 1-2 cm wide. 

 Sepals 4-6 mm long; flowers 1.5-2 cm wide; capsules about 1 cm long; seed 



1.5-2 mm long 4. H. prolificum. 



Sepals 2-2.5 mm long; flowers 1-1.5 cm wide; capsules 4-6 mm long; seed 



about 1 mm long. (See excluded species no. 444, p. 1073) 



H. densiflorum. 



Herbs (sometimes woody toward the base). 



Stamens in 3-5 clusters; styles separate; petals with black dots. 



Flowers and leaves many, the upper leaves usually not over 6 mm wide; 



introduced species 5. H. perforatum. 



Flowers and leaves few, the upper leaves usually more than 6 mm wide; 

 native species. 

 Sepals 3-4 mm long; petals with the black dots in lines. .6. H. punctatum. 

 Sepals 5-7 mm long; petals with the black dots on the margins. (See 



excluded species no. 446, p. 1074) H. graveolens. 



Stamens not in clusters; styles distinct, more or less united; petals without 

 black dots. 

 Lateral nerves of the under surface of the leaves obscure or wanting; leaves 



linear or nearly so 1. H. dolabriforme. 



Lateral nerves of the under surface of the leaves visible; leaves wider than 

 linear. 



Leaves and sepals more or less revolute 8. H. adpressum. 



Leaves and sepals not revolute. 



Sepals inclosing or nearly inclosing the capsule 9. H. denticulatum. 



Sepals much shorter than the capsule. 



Stems somewhat woody at the base; leaves oblong to linear-oblong, 



thick; seed about 2 mm long 10. H. cistifolium. 



Stems herbaceous; leaves elliptic, oval, lanceolate to narrow-lanceolate, 

 thin; seeds about 0.5 mm long. 

 Leaves spreading, elliptic-oblong, obtuse, broadest near the middle, 



pinnately veined. (See excluded species no. 445, p. 1074) 



H. ellipticum. 



Leaves ascending, lanceolate to narrow-lanceolate, broadest below 

 the middle, with 5-7 strong lateral veins, at least toward the 



base 11. H. majus. 



Stamens few (5-12, rarely more than 12) ; flowers not over 7 mm broad. 



Bracts of the inflorescence foliaceous, appearing as a continuation of the stem 



leaves 12. H. boreale. 



Bracts of the ultimate branchlets of the inflorescence subulate. 

 Leaves scalelike or linear-subulate, strongly ascending. 



Leaves scalelike; capsules much exceeding the calyx.. . .13. H. gentianoides. 

 Leaves linear-subulate, 6-20 mm long; capsules slightly exceeding the calyx. 



14. H . Drummondii. 



Leaves not scalelike or linear-subulate. 



Leaves linear, 3-nerved 15. H. canadense. 



Leaves not as above. 



Leaves ovate-oblong or short-elliptic, obtuse; stems usually diffusely 

 branched; only the ultimate branchlets of the inflorescence subulate- 

 bracted; capsules 2.8-4 mm long 16. H. mutilum. 



