KEY TO XATURAL OEDEES. 



Division III. Apetalous: Corolla none; the floral envelopes being id 

 a single series (calyx), or sometimes wanting altogether. 



A, Flovters not in aments or catkin-like heads. 

 1. Seeds many in each cell of the ovary or fruit. 

 Calyx with its tube coherent with the 6-celled page 

 ovary. Aristolochiace^, 268 



Calyx free from the ovary. 



Pod 3-ceUed or 1-celled, with 3 or more 



styles. Mollugo, &c., in Cartophtllace^. 56 



Pod or berry l-celled and simple. Eanunculace^, 26 



2. Seeds only 1-2 m each cell of the ovary or fruit. 

 Pistils more than one to the flower, and separate 

 from each other. 



Cal.yx present and petal-Hke. Stamens on 



tiie receptacle. Ranunculace^, 26 



Calyx present ; the stamens inserted on it. 



Leaves with stipules. Rosacea, 112 



Pittll only 1, simple, or formed of two or more, 

 with tlieii' ovaries united. 



Styles 10. Pruit a 10-seeded berry. Phytolaccace^, 270 



Styles or stigmas 2-3. 



Herbs vvith sheatMng stipules and entire 



leaves. Poltgonace^, 278 



Herbs with separate stipules and com- 

 pound or cleft leaves. Urticace^, 291 

 Herbs with milky juice : stipules decidu- 

 ous or none, and stigmas often forked. 



Fruit splitting mto 2-3 2-valved pods. Eethorbiace^, 287 

 Herbs without stipules, and 



Without scaly bracts. Flowers small 



and greenish. Chenopodiace^, 270 



With scaly bracts around and among 

 the flowers. Amarantace^, 27-5 



Shrubs or trees, with opposite leaves. 



Fruit a pair of keys. Acerace^, 89 



Shrubs or trees, with alternate leaves 

 and deciduous stipules. 



Stamens on the throat of the calyx, 



alternate with its lobes. Rhamnace^, 

 Stamens on the bottom of the calyx. Urticacej3, 

 Style 1 ; stigma 2-lobed. Fruit a key. Leaves 



pinnate. Fraxhaus in Oleacejs, 



Style or sessile stigma 1, and simple. 



Calyx of 6 petal-hke colored sepals : sta- 

 mens 9 - 12 : anthers opening by valves. 

 Aromatic shrubs or trees. Laurace^, 

 Calyx in the sterile flowers of 3 - 5 green- 

 ish sepals : stamens the same number. 



Flowers monoecious or dicecious. Urticace^, 291 



8.5 



291 



264 



285 



