PLATE XI.

Fig. 56. Appearance of a normal wheat stalk in the spring after "tillering" has commenced.

Fig. 57. A stalk of wheat plant at 20 days from seeding, sown at the depth of one inch; a. a. young plants.

Fig. 58. B. Stalk of wheat plant at 30 days, sown at the depth of six inches; a. point of tillering.

Fig. 59. Glume of wheat exhibiting the sexual apparatus of the flower.

a. Anther partially ruptured and extruded.

b. Anthers entirely extruded and ruptured.

e. Filaments.

d. Ovarium.

c. Anthers as they appear before extrusion commences.

The pistils are removed in this figure, to avoid confusion.

Fig. 60. A portion of the pistil highly magnified.

f.f. f. Pollen grains.

Fig. 61.

A small portion of the pistil very highly magnified. b. c. Portion of pistil.

a. Main cavity or duct leading from extremity of pistil to ovarium. d. A pollen grain penetrating a branch of the main duct.

Fig. 62. Glume of wheat exhibiting pistils and anthers in situ.