KEY TO THE FAMILIES OF CLASS I. 
109 
II. Monopetalous Division. Corolla with the petals more or less united into one piece. (Those 
which rank in other divisions are marked f.) 
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, 
t P ulse F. 141 
fFUMITORY F. 123 
t M allow F. 131 
f Camellta F. 134 
Ebony F. 172 
Heath F. 168 
2. Stamens just as many as the lobes of the regular corolla , 6, 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. 173 
Style 1. (Petals sometimes almost distinct,) Primrose F. 173 
Stamens alternate with the divisions or lobes of the corolla, 5 or rarely 4 
Inserted on the receptacle, Heath F. 168 
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. 188 
Anthers only surrounding the stigma: filaments distinct, Dogbane F. 187 
Inserted on the corolla, free from the stigma. 
