OXAGIIARIE.E 557 



with unequal cotyledons due to contortion or folding in the 

 seed. (E. Lamarckiana agrees with this type, but the coty- 

 ledons are generally quite entire. 



The fourth type consists of annuals represented by (E. 

 stricta (fig. 366). The seeds are of medium size with a mem- 

 branous reticulate testa, and the seedlings are vigorous, exhibit- 

 ing a distinct foliar development in the lower portion of the 

 cotyledons by the venation, the finely ciliate margin, and by a 

 distinct tooth above the middle on each side. The cotyledons 

 at different stages of growth vary from oblong to ovate, broadly 

 ovate, spathulate, and finally oblong-obovate or subrhomboid. 



The fifth type consists of annuals with purple flowers, large 

 rugose or papillosely punctate seed, margined or winged at the 

 chalaza, and sometimes around the raphe. The seedlings are 

 large, vigorous and rapid in growth, while the large cotyledons 

 show a marked foliar, intercalary growth such as occurs in 

 Clarkia sp. and C. integripetala above mentioned. This type 

 of (Enothera is well exemplified by (E. Lindleyana. The coty- 

 ledons exhibit the same phases of growth as Clarkia sp. (figs. 

 357-8), and ultimately become broadly ovate, emarginate with 

 a tooth in the notch, constricted about the middle with two 

 or three teeth on each side below that and finely ciliate. 

 (E. amcena agrees pretty closely with this type, but the cotyle- 

 dons are finely pubescent all over. (E. tenella quadrivulnera 

 has somewhat variable cotyledons. The commoner forms are 

 obovate-cuneate and frequently alternate in the ultimate stage 

 as in Clarkia sp. (figs. 357-8). Another form has obovate-oblong 

 cotyledons with the other characters of the type given. (E. 

 Bornanzowii has obovate cotyledons, considerably tapered to 

 the base in the ultimate stage, and often alternate. The upper 

 or true portion of the cotyledons is much the broader in this 

 species as well as in (E. tenella quadrivulnera, a condition 

 contrary to the general rule in the group. (E. purpurea and 

 (E. cheiranthifolia agree with the other species of this group 

 in all main particulars, and particularly in the lower portion 

 of the cotyledons being of a foliaceous nature. 



The sixth group corresponds to the subgenus Sphsero- 

 stigma, as the fifth did to that of Godetia. (E. macrantha (fig. 

 369) shows the foliar evolution of the cotyledons in this group. 



