FAM. 131, 132. 103 



the intermediate perfect, and the lower ones pistillate; the sterile 

 flowers with a 2-4 toothed or truncate calyx, 2-4 petals and I 

 stamens; the fertile flowers with a 4-grooved calyx, minutely 

 toothed; 4 small petals or none, and a 4-celled ovary with 2-4 often 

 plumose stigmas. In ponds and slow streams. Summer. 



Myriophyllum, 11';.' r Milfoil 



M. verticillatum. Slender; submerged leaves in whorls of 3 or 4, crowded, the 

 emersed pectinate-pin natifid; sterile flowers with 4 purple hooded petals 

 and 8 stamens; fruit smooth. 



M. heterophyllum. Stout; submerged leaves crowded, with hair-like segments, 

 the emersed in whorls of 3 to 6. linear to lanceolate, serrate; sterile flowers 

 with 4 oblong petals and 4-6 stamens; fruit roughened. 



M. proserpinacoides, Parrot's Feather. Leaves in whorls of 4-5; flowers dioe- 

 cious. Cultivated in fountain-vases. 



131. Nyssaceae (Cornaceae), Dogwood Family. 



Trees or shrubs with exstipulate simple leaves; flow- 

 ers in cymes or heads; calyx 4-5 toothed; petals 4-5, or 

 wanting; stamens 4-10. inserted with the petals at the 

 base of an epigynous disk; ovary inferior, 1-4 celled; style 

 1. stigma entire or lobed or cleft; ovules solitary in each 

 cell; fruit a drupe with acid pulp. 



1. Flowers in dichotomous cymes without involucre; — leaves opposite; 

 calyx 4-toothed or lobed; petals 4, white; stamens 4; ovary 2- 

 celled; drupe with thin pulp. Low woods along the river. 

 Spring. -------- Svida, Dogwood, Cornel 



S. (Cornus stricta. Twigs reddish brown, leaves smooth beneath, drupes pale 

 blue. 

 1. Flowers in a head subtended by a large white or pinkish involucre; — 

 leaves opposite, prominently veined; calyx 4-lobed; petals 4. 

 greenish; stamens 4; ovary 2-celled; drupes red. clustered. In 

 oak woods and planted. Spring. - Cynoxylon 



C floridum (Cornus florida), Flowering Dogwood. Leaves pubescent; sta- 

 mens exserted. 



132. Hederaceae ( Araliaceae), Ivy Family. 



Herbs, shrubs, trees or vines, cultivated for ornamental 

 or, as the Ginseng, for commercial purposes. Flowers 

 perfect or polygamous; calyx 5-toothed or truncate; petals 

 and stamens 5-10, both inserted in the margin of an epi- 

 gynous disk, alternate; ovary 2-5 celled, inferior; styles 

 2-5, sometimes united; ovules solitary; fruit a berry or 

 drupe. 



1. Vines with simple leaves; — fiowwi 5-parted. styles united, fruit a 



berry. ..._.--_-. Hedera 



H. Helix, Ivy. Leaves evergreen. 3-5 lobed or cleft; corolla yellowish green 

 1. HartM, shrubs or trees with compound leaves, ------ | 



