GAMOPETALE 165 
but maritime species such as Centaury, and marsh 
plants such as Bog Bean. 
Most of them are herbaceous perennials. A few 
are shrubs. Many of them are found in the flower- 
garden, such as the Gentians, Gentiana verna being 
a great favourite. 
The majority that are perennial are provided with 
a rhizome. The habit is erect, with terminal flowers, 
except in Bog Bean and Limnanthemum, the last 
being aquatic, and similar to the water lily in habit- 
The leaves, which are opposite, are usually entire, 
with no stipules. In Bog Bean they are trifoliate. 
The flowers are in cymes similar to that of Caryo- 
phyllacez. The calyx is four- to eight-lobed, and per- 
sistent and imbricate. The flower is regular. The 
corolla is campanulate or funnel-shaped, sometimes 
salver-shaped and convolute, tubular, with as many 
lobes as the calyx, imbricate and twisted, fringed at 
the mouth. The stamens alternate with the corolla 
lobes and are of the same number, inserted on the 
corolla. The anthers open inwards and are versatile, 
opening outwards ultimately. The ovary is made up 
of two carpels, with a glandular disc below. The 
style is simple, the stigma also simple or bilobed. 
The fruit is a capsule or berry, with small seeds. 
Boca BEAN (Menyanthes trifoliata). 
Though a marsh or bog plant, Buck or Bog Bean 
is not found in Huntingdonshire, once part of the 
