490 ANGIOSPERMS 
Fie. 440.— A portion of a Tomato 
plant bearing flowers and fruits, and also 
a flower enlarged to show the structure 
of the flower. 
by 
Fic. 441.— A portion of a Jimson 
Weed bearing flowers and fruit. Both 
sepals and petals are joined most. of their 
length. 
dodendrons and Heathers. 
The Trailing Arbutus 
(Epigaea), which is the 
favorite spring flower 
wherever it grows, and the 
Madrona, one of the most 
beautiful trees of the 
Pacific coast, belong to this 
family. 
Sweet Potato Family 
(Convolvulaceae). — The 
plants of this family are 
chiefly trailing or twining 
herbs. Their flowers, as 
those of the Morning Glory 
illustrate, are often quite 
showy. They have five 
stamens, and their calyx 
and corolla are composed 
of five parts (Fig. 438). 
There is usually one pistil 
with two or three locules 
in the ovary. 
The Sweet Potato is of 
considerable value for food 
and is quite extensively 
grown in a number of 
states. A number of 
plants of this family are 
weeds, of which the Morn- 
ing Glory (Ipomoea), Bind- 
weeds, and Dodders (Fig. 
489) are the chief ones. 
The Morning Glory and 
Bindweeds twine around 
cultivated plants, cutting 
off the light and often 
breaking them down. The 
Bindweeds are extremely hard to eradicate because of their 
spreading roots and rootstocks which propagate the plants 
