356 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE XLIX. 



(Reduced about one-third). 



Fig. I. Longitudinal section of a young spikelet : X 57; Ig, lower glume; 



c, carpel; ?, young ovary; <5 , young stamen. 



Fig. 2. Section of older spikelet to show the beginning of the lamina of the 

 lower glume: X 57; A lamina; other lettering as in fig. i. 

 Median longitudinal section of the primordium of a spikelet: X 320; 



d, dermatogen; pr, periblem; pi, plerome. 

 A similar section, not quite median, showing an older floral rudiment: 



X 320; st, floral apex; Ig, lower glume. 

 Longitudinal section of apex of flower in which the upper palet 



{up) and lodiculae {lo) appear: X 320. 

 Longitudinal section of floral apex: X 320; lettering as above. 

 Longitudinal section of young ovule with carpel {c): X 320. 



