22 KEY TO NATURAL ORDERS. 



DIVISION III. APETALOUS : Corolla none ; the floral envelopes being in 

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



A. FLOWERS 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.E, 268 



Calyx free from the ovary. 



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



styles. Mollugo, &c., in CARYOPHYLLACEJS, 56 



Pod or berry 1 -celled and simple. RANUNCULACE.E, 26 



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-like. Stamens on 



the receptacle. RANUNCULACE.E, 26 



Calyx present; the stamens inserted on it. 



Leaves with stipules. ROSACES, 112 



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

 with their ovaries united. 



Styles 10. Fruit a 10-seeded berry. PHYTOLACCACEJS, 270 



Styles or stigmas 2-3. 



Herbs with sheathing stipules and entire 



leaves. POLYGONACE.E, 278 



Herbs with separate stipules and com- 

 pound or cleft leaves. URTICACE.E, 291 

 Herbs with milky juice : stipules decidu- 

 ous or none, and stigmas often forked. 



Fruit splitting into 2-3 2-valved pods. EUPHORBIACEJS, 287 

 Herbs without stipules, and 



"Without scaly bracts. Flowers small 



and greenish. CHENOPODIACE.E, 270 



"With scaly bracts around and among 



the flowers. AMARANTACE^E, 275 



Shrubs or trees, with opposite leaves. 



Fruit a pair of keys. ACERACE^E, 89 



Shrubs or trees, with alternate leaves 

 and deciduous stipules. 



Stamens on the throat of the calyx, 



alternate with its lobes. RHAMNACE^E, 85 



Stamens on the bottom of the calyx. URTICACE.E, 291 



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



pinnate. Fraxinus in OLEACE^, 264 



Style or sessile stigma 1, and simple. 



Calyx of 6 petal-like colored sepals : sta- 

 mens 9-12: anthers opening by valves. 



Aromatic shrubs or trees. LAURACE^E, 285 



Calyx in the sterile flowers of 3 - 5 green- 

 ish sepals : stamens the same number. 

 Flowers monoecious or dioecious. URTICACE^E, 291 



