Ranales, Rhoeadctles, and Rosales. 719 
Braya snpina and Biscutella ciliata are described by Chauveaud 
as having the same general features. 
Resedaceae. 
Reseda alba presents a good example of the familiar diarch type of the 
Rhoeadales. 
Reseda odorata and Caylussa abyssmica, according to Chauveaud’s 2 
descriptions, are similar, except that he comments upon the separateness of 
the halves of the double bundle in the latter. 
Papaveraceae. 
Papaver paenijlorum and P. Dan. The transition features are quite 
characteristic of the cohort. Older seedlings of P. Dan show semi- 
obliteration of all the primary xylem, including that of the diarch plate. 
The cotyledons in P. paenijlorum are nearly cylindrical, and the small 
central bundle is not markedly double in the upper part. 
Glaucium serpicri. The comparison of seedlings of different ages 
shows that this is a form in which age causes the almost complete dis- 
Text-figs. 31, 32. 31, Glaucium serpieri ; 32, Ckelidonium majus. Nat. size. 
appearance of the primary elements, which are resorbed at an early stage, 
only a few isolated rings and portions of rings of wall thickening occasionally 
remaining. It is therefore very easy to overlook the central exarch proto- 
xylem elements in the upper part of the seedling. The plumular strands 
lignify late. 
Glaucium jlavum , described by Chauveaud, seems to be quite similar. 
Chelidonium majus. The cotyledons form a well-marked tube. The 
double bundle is of the extended secant form at the base of the cotyledons, 
as in Glaucium , &c. The primary elements disappear later, and a frag- 
mentary appearance is given by the scattered rings of thickening. The 
transition phenomena are quite normal. 
Bocconia japonica is a slender seedling showing the same general 
features as the preceding genera. Evidences of resorption were seen. 
Platysiemon californicus. The cotyledons are centric in structure. At 
1 Loc. cit., 191 1. 
2 Loc. cit., 1911. 
