HYPEEICACEAE. 191 



cium of few or many stamens, sometimes grouped, the groups sometimes 

 alternating with glands. Gynoecium of 2-5 united carpels. Fruit a 

 capsule. 



Sepals 4, in more or less unequal pairs : petals mostly 4. 1. ASCYRUM. 



Sepals and petals mostly 5. 

 Petals yellow. 



Leaves with flat more or less spreading blades. 2. HYPERICUM. 



Leaves reduced to erect or appressed minute or slightly 



elongate scales without blades. 3. SAROTHRA. 



Petals pink, sometimes tinged with green or purple. 4. TRIADENUM. 



1. ASCYRUM L. Shrubs. Sepals 4, very unequal. Stamens not in 

 groups. Styles relatively short. Capsule included in the calyx. ST. PETER 's- 

 WORT. 



1. A. hypericoides L. Plants diffuse: leaf -blades narrowly oblong-obovate, 

 spatulate, or linear, 5-15 mm. long: outer sepals ovate to oblong-ovate, 7-9 

 mm. long, the inner much smaller than the outer: petals linear-oblong: cap- 

 sules 7-8 mm. long. S. Common, on dry banks. Schists. Sum. ST. 

 ANDREW 'S-CROSS. 



2. HYPEEICTJM [Tourn.] L. Herbs or shrubs. Sepals 5, essentially 

 equal. Stamens mostly in groups. Style relatively long. Capsule not included. 

 Sum. ST. JOHN 'S-WORT. 



Styles 3, or rarely 4 : capsule 3-celled or rarely 4-celled : stigmas slender or slightly 



thickened. 



Herbs : stems simple or sparingly branched. 

 Stamens few, 5-12. 



Leaf-blades linear, 3-veined, not clasping. 1. H. canadense. 



Leaf-blades oblong to ovate, 5-nerved, clasping. 2. H. mutilum. 



Stamens numerous, 15-40. 



Capsules 3-celled : stamens grouped : petals with black 



dots or lines. 



Petals pale-yellow, with dots and lines : stem terete. 3. H. maculatum. 

 Petals deep-yellow, with marginal dots : stem 



flattened. 4. H. perforatum. 



Capsules 1-celled : stamens not grouped : petals with- 

 out dots. 5. H. ellipticum. 

 Shrub : stems bushy-branched. 6. H. prolificum. 

 Styles 5 : capsule 5-celled : stigmas discoid. 7. H. Ascyron. 



1. H. canadense L. Plants 1-6 dm. tall: leaf -blades 3-nerved: sepals lanceo- 

 late or linear-lanceolate, 3-5 mm. long: petals 3-6 mm. long: capsules 4-8 mm. 

 long, acute. N. S. Common, in moist sandy soil. Sandstones and shales, 

 schists. 



2. H. mutilum L. Plants 1-8 dm. tall: leaf -blades oblong-ovate to ovate, or 

 sometimes oblong, 5-nerved: sepals oblong to oblong-lanceolate: petals about 

 3.5 mm. long : capsules 2-3 mm. long, obtuse. Common, in moist places. 



3. H. maculatum Walt. Plants 2-9 dm. tall: leaf -blades leathery, ovate to 

 oblong-ovate or nearly oblong, 1-6 cm. long, obtuse, punctate: sepals lanceo- 

 late, 3-4 mm. long, acute: corolla pale-yellow, 8-13 mm. wide; petals delicate, 

 copiously black-dotted : capsules ovoid, 3-6 mm. long. Common, in dry fields 

 and on hillsides. 



4. H. perforatum L. Plants 4-7 dm. tall: leaf -blades linear-oblong, 5-20 mm. 

 long, glandular-punctate, those of the main stem usually subtending leafy 

 branches: sepals linear-lanceolate, 3-4 mm. long, acute, glandular-punctate: 

 corolla deep-yellow, 19-24 mm. wide; petals toothed on one side from the 

 middle to the apex, bearing black glands near the teeth : capsules ovoid, oblique, 

 6-8 mm. high. Common, in dry ifcelds and waste places. Nat. of Eu. 



5. H. ellipticum Hook. Plants 1-5 dm. tall: leaf -blades oblong to oval or 

 slightly broadest above the middle, 1-3 cm. long, obtuse, sessile and often 



