786 



HYPERICACEAE 



as long as the outer ones: corolla bright yellow, 2-3 cm. broad: styles 3: capsules 

 ovoid, about as long as the sepals. [A. amplexicaule Michx.] 

 In moist sandy soil, Georgia and Florida. Spring to fall. 



2. CROOKEA Small. 



Shrubs resembling species of Ascyrum. Sepals 4, nearly equal. Stamens not 

 in groups. Styles relatively long. Capsule not included. 



1. Crookea microsepala (T. & G.) Small. A branching shrub, with decumbent 

 or ascending stems. Leaves numerous; blades cuneate to linear-cuneate or narrowly 

 oblong, 6-14 mm. long, rounded at the apex, often slightly revolute, sessile: flowers 

 showy, 2-2.5 cm. broad: sepals 4, linear to oblong, obtuse: petals 4, yellow, unequal, 

 the smaller oblong, the larger obovate, obtuse : stamens numerous, distinct : capsules 

 oblong, 7-8 mm. long, much surpassing the sepals: seeds oblong, less than 1 mm. 

 long, striate and pitted. [Ascyrum microsepalum T. & G., Hypericum microsepalum 

 (T. & G.) A. Gray.] 



In sandy soil, southern Georgia and Florida. Spring. 



3. HYPERICUM L. 



Herbs or shrubs. Sepals 5, essentially equal. Stamens mostly in groups. Style 

 relatively long. Capsule not included. ST. JOHN 'S-WORT. 



Stamens few or several, 512, usually in 3 clusters. 

 Leaf-blades linear. 

 Leaf-blades ovate, oval or oblong. 



Sepals obtuse or somewhat acute: leaf -blades obtuse. 

 Sepals acuminate: leaf-blades acute. 

 Stamens numerous, 15-40, distinct or in clusters: capsules 3-5-celled or 



with intruding placentae. 

 A. Styles 3 or rarely 4: capsules 3-celled or with 3 more or less intruding 



placentae. 



a. Capsules 1-celled or incompletely 3-celled. 

 Capsules with parietal placentae, 1-celled. 

 Styles distinct: stigmas capitate. 



1. H. Canadense. 



2. H. mutilum. 



3. H. gymnanthum. 



Foliage glabrous: sepals not ciliate. 



Sepals conspicuously imbricated, at least the outer 

 broadest at the base: leaf-blades broadest about 

 the middle. 



Sepals not conspicuously imbricated, at least the 

 outer broadest about the middle: leaf -blades 

 broadest about the base. 

 Foliage tomentose: sepals ciliate. 

 Styles coherent, at least below: stigmas minute. 



Corolla over 18 mm. broad: capsules over -6 mm. high. 

 Corolla less than 18 mm. broad: capsules less than 



6 mm. high. 

 Capsules broadest at the top, about as long as the 



sepals. 

 Capsules broadest at the base. 



Sepals obtuse: seeds striate and pitted. 



Sepals acute or acutish: seeds transversely 



wrinkled. 



Capsules incompletely 3-celled by the intrusion of the placentae. 

 *Sepals very small or at least not foliaceous. 



Leaves never in conspicuous axillary clusters; blades 



relatively broad. 

 Sepals obtuse or merely acutish. 



Sepals less than ^ as long as the petals: capsules 



6-7 mm. long. 

 Sepals over H as long as the petals: capsules 12-13 



mm. long. 



Sepals manifestly acute or acuminate. 

 Leaves in conspicuous axillary clusters: blades narrow. 

 tLeaves of the axillary clusters mostly much smaller 

 than the main pair; blades neither subulate, 

 nor fleshy. 

 Cymes in terminal congested corymbs: buds broadly 



ovoid: mountain species. 

 Cymes in elongated narrow panicles: buds conic: 



lowland species. 

 tLeaves linear-oblong, spatulate or oblanceo- 



late. 

 Sepals oblong to lanceolate, not narrowed at 



the base. 



Sepals spatulate to elliptic-spatulate, nar- 

 rowed at the base. 



4. H. virgatum. 



5. H. acutifolium. 



6. H. setosum. 



7. H. dolabriforme. 



8. H, turgidum. 



9. H. opacum. 



10. H. sphaerocarpum. 



11. H. nudiflorum. 



12. H. apocynifolium. 



13. H. adpressum. 



14. H. glomeratum. 



15. H. interior. 



16. H. ambiguum. 



