ONAGRARIE^E 569 



at the base, oblong, acute, with a short petiole, all having the 

 nerves ascending and incurved towards the tip where they unite 

 with those next above them after having become exceedingly fine. 



DEVELOPMENT OP THE COTYLEDONS. 



(a) Immediately after germination the cotyledons are broadly 

 ovate or oval-ovate, obtuse, entire, with a slightly prominent colour- 

 less tooth at the apex of the midrib, flat and subsessile. 



(a) Another form about equally common at this stage has the 

 cotyledons involute, with one edge inside and the other outside 

 rarely with both edges inside the other cotyledon. 



(b) Nine days after germination they become broadly ovate, 

 obtuse, and entire with an innovation at the base not separated from 

 the true cotyledon by a constriction as in several other species, but 

 by a minute tooth on each side, and distinguished by being ciliate 

 with incurved hairs, while the upper part is glabrous. Petiole 1-25- 

 1-5 mm. long, and ciliate or pubescent. 



(b') The unequal ones still maintain their inequality. Larger 

 one deltoid or rotund, very obtuse, shallowly cordate at the base, 

 with the innovation ciliated with incurved hairs, while the upper 

 part is glabrous, marked with a minute or obsolete tooth on each 

 side. Smaller cotyledon narrower and less rounded. 



(c) Sixteen days after germination the equal cotyledons are still 

 ovate, obtuse, equal at the base, petiolate with the innovation thinly 

 ciliate at the margin. 



(c') The unequal cotyledons are broadly ovate or deltoid, obtuse, 

 entire, generally very unequal at the base, but the two are often 

 dissimilar in that respect, ciliated with incurved hairs on the lower 

 larger part corresponding to the innovation (fig. 365). 



(Enothera Lamarckiana, DC. 



Seeds 1-5-2 mm. long, 1-1-5 mm. wide. 



DEVELOPMENT OF COTYLEDONS. 



The cotyledons immediately after germination are oblong or 

 broadly ovate-oblong, obtuse, entire, sessile and glabrous. Hypocotyl 

 short and glabrous. Primary root simple, with root-hairs. 



Ten days after germination the cotyledons are ovate, obtuse, 

 entire, shortly petiolate, ciliate in the lower part with incurved short 

 hairs. Petioles pubescent. Hypocotyl pubescent. 



Twenty-three days after germination they are broadly ovate, 

 obtuse, entire, rather suddenly narrowed above the middle, with 

 rather long petioles ; upper part glabrous, without a discernible mid- 

 rib ; lower part pubescent at the margins with incurved hairs, and 



