420 OX SEEDLINGS 



and brown seeds. In the course of six days, five of the brown 

 seeds germinated, and only one black seed in the course of 

 thirteen days, whereas by that time twenty-three of the brown 

 seeds had germinated. Twenty-three days after being sown, 

 ten of the black seeds had germinated, and twenty-six of the 

 large brown ones. The seed of Chenopodiurn petiolare is 

 small and orbicular and laterally compressed, but in other 

 respects resembles that of C. Bonus-Henricus. 



Seedlings. The cotyledons coming under my notice are 

 all of simple types, notwithstanding the difference in the 

 seeds. Two of the types cannot be separated by hard and 

 fast lines, as they gradually merge the one into the other. 

 One of the simplest and widely prevailing forms is repre- 

 sented by Chenopodiurn Bonus-Henricus (fig. 610) which has 

 linear-lanceolate cotyledons tapered gradually into petioles 

 which are slightly connate at the base. The first two leaves 

 are ovate, the third roundly cordate. The cotyledons of C. 

 Quinoa are shorter and broader and, like the above, one-nerved. 

 The first three leaves are oblong and mealy. The cotyledons 

 of Blitum virgatum minus are small, linear and petiolate. A 

 rather interesting evolution is shown by the leaves. The first 

 is linear, the second spathulate, the third oblong, the fourth 

 and fifth lanceolate-hastate, the sixth and seventh hastate, and 

 the eighth to .the twelfth inclusive cuneate, trifid, and tri- 

 nerved. These characters vary, however, in different seedlings 

 according to the vigour of the same. The cotyledons of 

 Atriplex hortensis are similar to those of Blitum virgatum 

 minus. The leaves are opposite, the two first pairs being 

 oblong-ovate, followed by three other pairs which are tri- 

 angular and variously toothed, angled, or hastate. 



A relatively broader type is represented by Chenopodium 

 ficifoliurn which has oblong-lanceolate, petiolate, one-nerved 

 cotyledons. The two first leaves are opposite and oblong, 

 followed by five which are alternate and lanceolate. The 

 eighth to the thirteenth are more or less hastate, and in 

 robust seedlings most of the primary ones show a tendency to 

 be hastate. The cotyledons of Chenopodium viride are oblong, 

 obtuse and mealy. The first pair of leaves are similar but 

 broader. The cotyledons of Blitum virgatum (fig. 611) are 



