274 Sargent — Notes on the Life-History of Pterostylis. 
EXPLANATION OF PLATES XVIII AND XIX. 
Illustrating Mr. O. H. Sargent’s paper on Pterostylis. 
PLATE XVIII. 
Flowering specimens of Pterostylis rejiexa growing in their natural surroundings. 
PLATE XIX. 
All figures are Pterostylis rejiexa. 
Fig. i. Side view of flower, one sepal, petal, and part of galea removed to show internal arrange- 
ment. /. the labellum in the contracted position ; its appendage is seen below. 
Fig. 2. Front view of flower, one sepal removed, p.p . lateral petals; m.s. median sepal — the 
three collectively forming the galea, l.s. lateral sepal. 
Fig. 3. Side view showing petal ; one sepal and part of galea removed, c. column. Sections 
of the petal at various heights are shown on the right. 
Fig. 4. Column (front view). 
Fig. 5. Column (wings spread open), anth. anther ; rost. rostellum ; stig. stigma. 
Fig. 6. Section showing attachment of petal to galea, p. petal ; s. sepal. 
Fig. 7. Labellum viewed from within, app. appendage. 
Fig. 8. Labellum (side view), app. appendage; on right section of blade. 
Fig. 9. Top of column and one wing. 
Fig. 10. Side view of column. 
