I9I6 



A TEXTBOOK OF THEORETICAL BOTANY 



Among the commonly cultivated genera are Antirrhinum, Mimulus, 

 Calceolaria, Nemesia, Collinsia and Pentstemon. 



Fig. 1842. — Distribution of Digitalis purpurea in Europe. 



The plants are herbaceous or rarely shrubby, with leaves arranged 

 opposite, alternate or verticillate. Stipules are absent. The stems may be 

 prostrate but are more usually erect. Some are climbers. 



The inflorescence varies considerably, it may be racemose or a spike, 

 but often the lateral branches of inflorescences have the flowers arranged in 

 cymes. Occasionally the flowers are solitary and axillary. Bracts and 

 bracteoles are usually present. 



The flowers (Fig. 1843) are hermaphrodite and zygomorphic. They 

 are fundamentally pentamerous, but the typical condition is often obscured 

 by the suppression and fusion of the parts. 



o o 



Fig. 1843. — Scrophulariaceae, floral diagrams. A, Veronica 

 chamaedrys. B, Verbascum nigrum. {After Eichler.) 



