20 KEY TO NATURAL ORDERS. 



DIVISION II. MONOPET ALDUS : Calyx and corolla both present ; the petals 

 more or less united. 



A. TUBE OF THE CALYX COHERENT WITH THE OVARY, the corolla ap- 

 parently inserted on the ovary. 

 Stamens united by their anthers, and 



Not by their filaments. Flowers in heads PAGE. 



which are furnished with an involucre. COMPOSITE 168 



Also more or less by their filaments. Flowers 

 not in heads. 

 Corolla irregular, cleft down one side. 



Flowers perfect. LOBELIACE^:, 206 



Corolla regular. Flowers monoecious. 



Tendril bearing vines. CUCURBITACEJE, 138 



Stamens separated from each other, and 



Inserted on the corolla. Leaves opposite or 

 whorled. 



Leaves opposite, without stipules. 



Flowers in an iuvolucrate head. DIPSACEJE, 167 



Flowers not involucrate. 



Stamens 2 -3. Corolla 5-lobed. YALERIANACE^:, 165 

 Stamens 4-5. Corolla 4-5- 



lobed. CAPRIFOLIACEJE, 160 



Leaves opposite with stipules between 



them, or whorled without stipules. RUBIACE^E, 163 



Inserted with but not on the corolla. 



Stamens twice as many as the lobes of 



the corolla. 

 Woody plants. Huckleberry sub-family 



[in ERICACEAE, 207 



B. CALYX FREE FROM THE OVARY ; the corolla on the receptacle. 



1. Stamens more in number than the lobes of the corolla. 

 Leaves compound. Flowers commonly irregular. 



Pod 1 -celled. LEGUMINOSJE, 93 



Leaves simple or palmately divided. Stamens 



united into a tube. MALVACEAE, 63 



Leaves simple, undivided. Stamens united only 

 at the base, or separate. 



Stamens on the corolla, twice or four times as 



many as its lobes. EBENACEJS, 217 



Stamens free from the corolla, twice as many 



as its lobes. ERICACEAE, 207 



2. Stamens as many as the 5, 4 or rarely 6-7 lobes of the regular corolla. 

 Stamens alternate with the lobes of the corolla, 5 

 or rarely 4. 



Inserted on the receptacle. ERICACEAE, 207 



Inserted on the corolla, but connected more 

 or less with the stigma. Juice milky. 

 Filaments monadelphous. ASCLEPIADACE^E, 261 



