106 POPULAE FLORA. 



seeds ; but embryos are represented in the figures, to show the student what is 

 meant. — For the other class, see p. 203. 



KEY TO THE FAMILIES OR ORDERS OF CLASS I. 



Subclass I. — ANGIOSPERMS. 

 With a regular pistil, and a seed-vessel in which the seeds are formed. See Paragr. 219, 311. 



I, Polypetalous Division, Calyx and corolla both present ; the petals entirely separate. 



A. Stamens more than 10. 

 1. Stamens on the receptacle, UTiconnected either witli Hie calyx, corolla, or ovary. 



Pistils more than one, entirely separate from each other. 



Herbs, with perfect flowers. f age 



Leaves not shield-shaped, generally cut, toothed, or compound, Crowfoot Family, 112 



Leaves shield-shaped, fixed by their middle, Water-shield, 121 



Woody vines, with dioecious flowers, shield-shaped leaves fixed near the edge, Moonseed F. 118 



Small trees with perfect flowers, 6 petals, and entire leaves, Custard-Afpi.e F. 11 ^ 



Pistils many, grown together one above or over another on a long receptacle, Magnolia F. 11 V 



Pistils several, sunk in the flat top of a broad receptacle, Nelumbo, 121 



Pistils 3 to 6, the ovaries partly grown together in a circle, making 



A bladdery pod of several cells. Fennel-flower in Crowfoot F. 112 



A several-horned one-celled pod, Mignonette F. 1-5 



Pistil only one, at least having only one ovary; and that 



Simple and one-celled, only one placenta or seed-bearing part. 



Petals 6 to 9, large. Leaves 1 or 2, many-lobed, May- Apple in Barberry F. 119 



Petals 4 and irregular, or else very small. Crowfoot F. 112 



Compound, with many seeds on a placenta from the bottom of the cell. Purslane F. ISO 



Compound, if one-celled, then with two or more seed-bearing lines on the walls. 



Calyx falling when the flower opens ; sepals fewer than the petals, Poppy F. 123 



Calyx falling after blossoming. Style 1 : ovary several-celled. 



The 5 sepals edge to edge in the bud. Fruit dry, 1-seeded, Linden F. 133 



The sepals overlapping in the bud. Fruit many-celled, Orange F. 134 



Calyx remaining beneath the fruit. 



Leaves with transparent or dark colored dots, all opposite, St. John's-wort F. 12S 



Leaves not dotted. Ovary and pod one-celled, Cistus F. 127 



Leaves not dotted. Ovary several-celled. Aquatic or bog plants. 



Leaves pitcher -shaped. Style umbrella-like, Sidesaddle-Flower F. 121 



Leaves rounded and heart-shaped. Style none, Water-Lily F. 12C 



2. Stamens connected with the bottom of the petals, ami these borne on the receptacle. 



Filaments united in a pretty long tube or column: anthers kidney-shaped, one-celled, Mallow F. 131 

 Filaments united only with the base of the petals : anthers oblong, two-celled, Camellla F. 132 



