1915] AYRES—FLOWER OF ADENOCAULON 157 
EXPLANATION OF PLATES XI AND XII 
All figures except fig. 1 were made with a Bausch and Lomb camera lucida. 
The plates are reduced to one-half of the original size. The magnifications 
are for the drawings as reduced. 
PLATE XI 
_ All figures (except fig. 1) 77.5 
Fic. 1.—A mature inflorescence; 8. 
Fic. 2.—The first appearance of raceme between upper leaves (s). 
IG. 3.—First appearance of bracts of raceme (a and c); 6, axis of bract; 
r, receptacle of terminal head. 
Ics. 4 and 5.—Further development of raceme. 
1G. 6.—First appearance of flower primordia (7* and 7”). 
Fic. 7.—Further development of flower primordia. 
Fic. 8.—A primordium dividing (x). 
Fic. 9.—Further division of primordium (x); », widening of top of stami- 
nate iu c, involucral bract; 6, axillary head; a, bract of the inflorescence. 
IG. 10.—Inflorescence completed: x, detain of a primordium almost 
pe r?, staminate isaidy rt, pistillate Ss mr, first pigtuoom 
of corolla by a marginal ring; rolla in more advanced stage; stamen. 
IG. 11.—Further seinen of staminate (7?) ad pistillate ms flowers: 
é, ae st, stamens; ca, carpels 
G. 12.—Further developatumt of fig. 11: oc, ovarian cavity; other parts 
ee as in fig. 11 
PLATE XII 
Fic. 13.—A developed staminate flower: s#i, stigma; st, stamen; oc, 
ovarian cavity; 5", b?, and 03, branching points of the bundles; X30. 
IG. 14.—Ovule: i, integument enveloping megaspore mother cell; a 
cell of the nucellus still remaining parallel to the megaspore mother cell; nu, 
nucellus; 335. 
Fic. 15.—First appearance of gland-hairs by the elongation of epidermal 
cells; X 335. 
Fics. 16-18.—Development of gland-hairs; 335. 
Fic. S —Developed gland; X 250 
Fic. 20.—A mature pistillate dawes showing path of the bundles: s/i, 
cleft sigma; st, sterile stamen; X30. 
IG. 21.—Inner megaspore has become the embryo sac, and its nucleus 
has ses through the first stage of division; mu, nucellus; 766.5 
Fic. 22.—Older embryo; X 550. 
I .—Details of the extine and intine: three germination spots; 
v, ieietalie nucleus; g, two male cells; 766. 5. 
