54 THALAMlFLORiC 



Found only on the coasts of Devon and Cornwall. — Fl. summer. 

 Perennial. 



8. H. pnlchrum (Slender St. John's Wort). — Stem erect, round 

 smooth, slender, 1-2 feet high ; leaves heart-shaped, embracing 

 the stem, marked with pellucid dots ; sepals obtuse, fringed with 

 black sessile glands. A slender plant, with scanty foliage, and 

 golden yellow flowers, which, when in bud, are stained externally 

 with red. — Fl. July, August. Perennial. 



9. H. hirS'Utum (Hairy St. John's Wort). — Stent erect, nearly 

 round, downy ; leaves shortly stalked and downy beneath ; flowers 

 like H. pulchrtrnt, but a lighter yellow, and the plant rather 

 taller. Woods, especially in chalky or limestone soil, common. 

 — Fl. July. Perennial. 



ID. H. montanimi (Mountain St. John's Wort). — Stem erect, 

 round, smooth ; leaves oblong, sessile, smooth, with black dots 

 near the margin on the under side ; sepals acute, fringed with 

 shortly-stalked glands ; growing about 2 feet high, and at once 

 distinguished from any of the preceding species by the black 

 fringe of its sepals. Limestone hills, not common. — Fl. July. 

 Perennial. 



II. H. Elodes (Marsh St. John's Wort);. — Stem creeping, 6-12 

 inches long ; branches erect ; leaves roundish, and, like the stems 

 which they clasp, densely clothed with, shaggy down ; flowers few, 

 pale yellow, remaining open but a short time. Spongy bogs ; 

 not uncommon in Western England. — Fl. July, August. Perennial. 



Natural Order XIX 

 ACERACEyE.— The Maple Tribe 



Really a tribe of the Natural Order, Sapindaceee, in another 

 tribe of which occur the Horse-chestnut [HippocastanecB] and the 

 Litchi. The Acers are trees with opposite, stalked leaves, which 

 are veined in a palmate manner. Calyx divided into 5 parts 

 (occasionally 4-9) ; petals of the same number ; stamens about 8, 

 inserted on a flattened ring beneath the ovary ; ovary 2-lobed ; style 

 i; stigmas 2; fruit 2-lobed, 2-celled, not bursting; loles winged 

 on the outside ; cells 1-2-seeded. Found only in the temperate 

 regions of the northern liemisphere ; several species abound in 

 a sweet juice, which in North America is manufactured into maple 

 sugar. 



I. Acer (Maple). — Calyx 5-cleft ; petals 5 ; capsules 2, each 

 furnished with a long wing. (Name from the Celtic, ac, a point, 

 on account of the hardness of the wood, which was used for making 

 spears and other shariD-pointed instruments.) 



