22 



KEY TO XATURAL ORDEES. 



the floral envelopes beii 

 altoo-ether. 



Rosacea, 



Pettolaccace^, 270 



Division III. Apetalous: Corolla none 

 a single series (calyx), or sometimes "V^^antin^ 



A. Flowers not in amexts or catkin-like heads. 

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

 Calyx with its tube coherent with the 6-celled 



ovary. Aristolochiace^ 

 Calyx free from the ovary. 



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



styles. Mollugo, &c., in CARYOPHrLLACE^E, 



Pod or berry 1-celled and simple. Ranunculace-E, 



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



Pistils more than one to the flower, and separate 

 from each other. 



Calyx present and petal-hke. Stamens on 



the receptacle. 

 Calyx present ; the stamens inserted on it. 

 Leaves with stipules. 

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

 with their ovaries united. 



Styles 10. Pruit a 10-seeded berry. 

 Styles or stigmas 2 - 3. 



Herbs with sheathing stipules and entire 

 leaves. 



Herbs with separate stipules and com- 

 pound or cleft leaves. 

 Herbs with milky juic3 : stipules decidu- 

 ous or none, and stigmas often forked. 

 Fruit splitting info 2-3 2-valyed pods. 

 Herbs w-ithout stipules, and 



Without scaly bracts. Flowers small 



and greenish. 

 With scaly bracts around and among 

 the flowers. 

 Shrubs or trees, with opposite leaves. 



Fruit a pair of keys. 

 Shrubs or trees, with alternate leaves 

 and deciduous stipules. 



Stamens on the throat of the calyx. 



alternate with its lobes. 

 Stamens on the bottom of the calyx. 

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



pinnate. Fraxinus in Oleace^, 



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. 

 Calyx in the sterile flowers of 3 - .5 green^ 

 ish sepals : stamens the same number. 

 Flowers monoecious or dioecious. 



POLTGONACEiE, 

 L'RTICACE^, 



Chenopodiacej:. 



AilARANTACE^, 

 ACERACE^, 



Rhamnace^, 



L'RTICACE^, 



Latjrace^, 



P^GE. 



268 



56 

 26 



26 

 113 



278 

 291 



EUPHORBIACE^, 287 



LTrtigaceje, 



270 

 275 

 89 



85 

 291 



264 



285 

 291 



