KEY TO THE FAMILIES OF CLASS I. 



109 



II. Moiiopetalous Division. Corolla with the petals more or less united into one piece. (Those 



which rank in other divisions are marked t-) 



A. Corolla on the ovary, i. e. tube of calyx coherent. 



Stamens united by their anthers, and 



Not by their filaments. Flowers in heads, with a calyx-like involucre, 

 Also generally by their filaments, more or less. Flowers not in heads. 

 Corolla irregular, split down one side. Flowers perfect. 

 Corolla regular, succulent vines, with tendrils. Flowers monoecious. 

 Stamens separate from each other, and 



Inserted on the corolla. Leaves opposite or whorled- 



Leaves opposite, without stipules. Head of flowers with an involucre. 

 Leaves opposite, without stipules. Head, if any, without an involucre. 

 Stamens two or three fewer than the 5 lobes of the corolla. 

 Stamens as many as the lobes of the corolla, or one fewer. 

 Here one might expect to find the 

 Leaves whorled, without stipules, 

 Leaves opposite, with stipules. 

 Inserted with, but not on, the regular corolla. 



Stamens as many as the lobes of the corolla. Herbs, 



Stamens twice as many as the lobes of the corolla. Woody plants, 



Composite F. 164 



Lobelia F. 167 

 t Gourd F. 154 



Teasel F. 164 



Valerian F. 164 



Honeysuckle F. 161 



tMlRABILIS F. 191 



Madder F. 163 



Campanula F. 167 

 Huckleberry F. 168 



B. Corolla on the receptacle below the ovary, i.e. Calyx free (except in Brookweed). 

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



Leaves compound : pod one-celled. Flowers commonly irregular. 



Stamens 10 or rarely more when the flower is regular, 



Stamens 6 in two sets. Petals 4, united, 

 Leaves simple or palmately divided. Stamens many, monadelphous in a tube, 

 Leaves simple, undivided. Stamens united only at the bottom, or separate. 



Stamens very many, adhering to the base of the corolla. 



Stamens on the corolla, twice or four times as many as its lobes, 



Stamens separate from the corolla, twice as many as its lobes. 



tPULSEF. 141 

 tFUMITORY F. 123 



t Mallow F. 131 



t Camellia F. 134 

 Ebony F. 172 

 Heath F. 168 



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



Stamens one opposite each division of the corolla. 



Styles 5: calyx a chaff'-like cup: petals 5, almost distinct, Leadwort F. 



Style 1. (Petals sometimes almost distinct,) Primrose F. 



Stamens alternate with the divisions or lobes of the corolla, 5 or rarely 4, 



Inserted on the receptacle, Heath F. 



Inserted on the corolla, but connected more or less with the stigma. Juice 

 milky. Ovaries and pods 2 to each flower. 

 Anthers lightly adhering to the stigma: filaments monadelphous, Milkweed F. 



Anthers only surrounding the stigma: filaments distinct, Dogbane F. 



Inserted on the corolla, free from the stigma. 



173 

 173 



188 

 187 



