106 POPULAR 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. — ANGIOSPEEMS. 

 With a regular pistil, and a seed-vessel in "wMcli 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, unconnected either with Uie col-yx, coroUa, or ovary. 



Pistils more than one, entirely separate from each other. 



Herbs, with perfect flowers. Pi... 



Leaves not shield-shaped, generally cut, toothed, or compound, Croavfoot Family, Hi 



Leaves shield-shaped, fixed by their middle, Water-shield, la* 



Woody vines, with dioecious flowers, shield-shaped leaves fixed near the edge, Moonseed F. 11n 



Small trees with perfect flowers, 6 petals, and entire leaves, Custaed-Apple F. IIh 



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



Pistils several, sunk in the flat top of a broad receptacle, Nelumbo, 12i 



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



A bladdery pod of several cells. Fennel-flower in Crowfoot F. 11a 



A several-horned one-celled pod, JIignonette F. 12b 



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. 11? 



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. 130 



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. 132 



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



The 6 sepals edge to edge in the bud. Fruit dry, 1-seeded, Linden F. 103 



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. .Joii.n's-wort F. 128 



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. 120 



2. Stamens connected xoith the bottom of the petals, and 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, Camellia F. 132 



