68 SIR J. LUBBOCE—PHYTOBIOLOGICAL OBSERVATIONS. 
The first leaves are alternate, lanceolate, obtuse, petiolate, 
alternately nerved on the upper half, and oppositely nerved on 
the basal half, obtusely and obsoletely dentate at the margin, and 
glandular pubescent. Here, again, the foliar portion of the 
cotyledon resembles the true leaf. 
Fig. 144. 
SS 
—— 
Gnothera taraxacifolia : 16 days after germination. Nat. size. 
In Clarkia gaurioides the cotyledons immediately after germi- 
nation (fig. 145) are oblong-orbicular, emarginate, with a small 
tooth in the notch, slightly auricled at the base, and sessile, with 
a scarcely discernible midrib. After five days a new growth has 
taken place at the base (fig. 146), much narrower than the true 
cotyledon, and with a small tooth on each side. After ten days 
the new portion is as long as, though narrower than, the true 
cotyledon, and has 2,3, or 4 teeth on each side, with a well- 
marked midrib.  Eighteen days after germination the new 
portion is both longer and broader than the true cotyledon; the 
whole organ is broadly ovate, cuneate at the base, petiolate, the 
new portion has 4—6 small obtuse teeth on each side, is broadly sub- 
elliptie in outline, and minutely ciliate at the margin. It is 
remarkable also that the cotyledons have become more or less 
distinctly alternate. Here it is still more evident, as figs. 147 
