SIR J. LUBBOCK—PHYTOBIOLOGICAL OBSERVATIONS. 67 
pubescent, and has a pale pink or purplish midrib, ending in a 
roader purple patch at the base of the terminal portion. 
; A ter this stage the apical portion alters but little. The 
asal portion, on the contrary, continues to grow; so that, a 
month after germination, the cotyledons (fig. 143) are oblon 
distinctly petiolate, constricted at the union between the original 
cotyledon and secondary growth, emarginate with a minute 
tooth in the notch, cuneate at the base, with a distinct midrib 
throughout, and a few indistinct alternate nerves on each side. 
Fig. 143. 
1 
; 
j] 
| 
= 
TEST 
TAM 
Fig. 142. Clarkia rhomboidea : 8 days after germination. X3. 
Fig. 143. Ditto: 30 days after germination. Nat. size. 
The first pair of leaves are opposite, ovate, 
the base, alternately incurvinerved, entire, 
and densely pubescent. 
In Enothera taraxacifolia the cotyledons are at first oblong, 
obtuse, entire, sessile, and with glandular pubescence on the upper 
surface. They grow rapidly, and one day after germination they 
are much larger and petiolate, but otherwise unaltered. They 
gradually (fig. 144) become emarginate, and grow more in length 
than in breadth. The petioles also elongate considerably. 
obtuse, cuneate at 
shortly petiolate, 
