20 



KEY TO XATUEAL OkuEES. 



Division' II. Moxopetalous : 

 more or less united. 



Calyx and corolla both present ; the petals 



A. Tube of the calyx coherext with the oyart, the corolla ap- 

 parently inserted on the ovary. 



Stamens united by their anthers, and 



Not by their filaments. Flowers in heads 



which are furnished with an involucre. Composite;, 

 Also more or less by their filaments. Flowers 

 not in heads. 



Corolla irregular, cleft down one side. 



Flowers perfect. Lobeliace-E, 

 Corolla regular. Flowers monoecious. 



Tendril bearing vines. CucimBiTACEJE, 

 Stamens separated fi'om each other, and 



Inserted on the corolla. Leaves opposite or 

 whorled. 



Leaves opposite, without stipules. 



Flowers in an involucrate head, Depsace^, 

 Flowers not involucrate. 



Stamens 2-3. CoroUa 5-lobed. Yaleriaxace^, 

 Stamens 4-5. Corolla 4-5- 

 lobed. Caprifoliaceje, 

 Leaves opposite with stipules between 

 them, or whorled without stipules. Rubiace^, 

 Inserted with but not on the corolla. 



Stamens twice as manv as the lobes of 



the corolla. 

 Woody plants. Huckleberry sub-family 



[in Ericaceae, 



B. Calyx free from the ovary ; the corolla on the receptacle. 

 1. Stamens 7nore in number than the lobes of the corolla. 

 Leaves compound. Flowers commonly irregular. 



Pod 1 -celled, ^ Legumixos^, 



Leaves simple or palmately divided. Stamens 



united into a tube. Malvace^, 

 Leaves simple, undivided. Stamens united only 

 at the base, or separate. 



Stamens on the corolla, twice or four times as 



many as its lobes Ebexace.^;, 

 Stamens free fi'ora the corolla, twice as many 



as its lobes. Ericace^, 

 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. Erigace^ 

 Inserted on the corolla, but connected more 



or less with the stigma. Juice milky. 



Filaments monad elphous. ' Asclepiadacex 



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