4 
Xanthium Canadense, Mill. 
G. Fruit with hooked prickles (x 2). H. Akene from side and edge, J. Cross 
sect. of cotyledons, K. Vertical sect. of same. L. Seedling. M. Same older. 
L. and M. nat. size. 
Plate CX XXXVI. 
Chrysanthemum Leucanthemum, L. 
A, Akene (x 8). B. Seedling (x 3). C. Same, older (nat. size), 
Anthemis arvensis, L. 
D. Akene (x 10). E. Seedling with first three leaves (x 2). F. Same, older 
(nat. size), 
Achillea Millefolium, L. 
G. Akene (x 10). H. Seedling (x5). J. Same, older (x 5). 
Artemisia Absinthium, L. 
K. Akene (x 12) L. Seedling (x 3). M. Same, older (x 5). 
Plate CXXXVII, 
Cnicus arvensis (L.) Hoffm. ee 
A. Akene (x 10). B, Embryo (x 10). C. Seedling (x 5). D. Same older. 
flelianthus divaricatus, L, ; 
E, Akene (x 3), F. Embryo (x 3). G. Seedling (nat. size). 
Coreopsis discoidea, Torr. and Gr. 
H. Akene (x 6). I. Embryo removed from coats (x 8). J. Seedling (x 2). K. 
Same older (nat. size). 
Heliopsis helianthoides Cis.) Bis. P. . 
L. Akene (x 5). M. Young seedling (x 2). N. Same older (nat. size). O. 
Internode of stem with two pubescent lines running from the axil of the leaf to 
the point (on the next node above,) between the bases of the leaves, 
Plate CXXXVIII. 
Arctium Lappa, L, oe 
A. Seedling with cotyledons fully developed. B. Akene (x 3). C. Vertical sec- _ 
tion of akene. (x 3). D. Seedling with first leaf developed. E. Seedling - 
with first three leaves developed. F. Cotyledon (x 5). pak ae 
Cnicus muticus (Michx.) Pursh. Ole. 
G. Seedling with cotyledons fully developed. H. Seedling with first two leaves _ 
It and 1? developed I. Akene (x 5). K. Vertical section of aint, So: 1S ee 
Taraxacum officinale, Web, | ee 
L. Seedling (x 2) with cotyledons fully developed. M. Later stage of same — 
with first two leaves I! 12 developed. N, Akene ‘(x 4). p. beak. O. Em- 
bryo (x 6) removed from its coats and with cotyledons spread apart. 
Lactuca spicata (Lam.) Hitch. , eee 
P.R. and S. successive stages in the devolopment of seedling. S, Magnified three — : 
times the others natural size. T. Akene, U. Same (edge) (x5). V. Embryo ed 
_ Temoved from coats (x 5). es ee ee 
Prenanthes Serpentaria, Pursh. 
W. Seedling (x 3) X. Sameat lat 
ee Winige: Cnet tine) 1) 
