KEY TO THE FAMILIES OF CLASS I. 



IW 



II. 



monopetalous Division. Corolla with the petals more or less united into one piece, 

 which rank in other divisions are marked t-) 



(Those 



Composite F. 164 



Lobelia 

 tGouKD 



F. 167 

 F. lf.4 



Teasel F. 164 



A. Corolla on ihe 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 monoeoious, 

 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, 



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

 1. Stamens Tnore 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, tPuLss F. 141 



Stamens 6 in two sets. Petals 4, united, fFuMiTORY F. 123 



Leaves simple or palmately divided. Stamens many, monadelphous in a tube, fMALLOW, F. 131 

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



Stamens very many, adhering to the base of the corolla, t Camellia F. 



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



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



2. Stamens just as many as the lobes of the regular corolla, 5, 4, or rarely & or*I. 



Stamens one opposite each division of the corolla. 



Styles 5: calyx a chaff-like cup : petals 5, almost distinct, Leadwokt F. 173 



Style 1. (Petals sometimes almost distinct,) Primrose F. 173 



Stamens alternate with the divisions or lobes of the corolla, B 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. 



134 

 172 

 168 



