THE MORPHOLOGY OF WEEDS 



declining from the side. The term orthotropous is applied 

 to the straight ovule, as in buckwheat; campylotropous, 



Fig. 77. A clus- 

 ter of carpels of 

 Indian mallow or 

 butterprint. (C. 

 M. King.) 



Fig. 76. Fertilization in 

 the cotton plant. P, pollen 

 tube passing down the 

 style; E, egg cell in em- 

 bryo sac, which unites 

 with a cell of the pollen 

 tube. (Duggar.) 



Fig. 78. Fruit 

 known as a fol- 

 licle of larkspur. 

 (Ada Hayden.) 



Fig. 79. Two views of 

 castor oil bean ; car., caruncle. 

 (C. M. King.) 



Fig. 80. Bean seed: 

 m, micropyle; h, 

 hilum; r, radicle; c, 

 caulicle; cot., cotyle- 

 don. (C. M. King.) 



