Lee. — Observations on the 
3i8 
at the centre, the phloem groups unite laterally, and the diarch root is 
complete. 
Dimorphotheca pluvialis, Moench. This species is interesting in that 
the small crop of seedlings grown included many tricotyledonary examples, 
while the rest showed all 
stages between these and 
seedlings with the normal 
number of cotyledons. Re- 
ference to Text-Fig. 1 (p. 
319) will show that the larger 
number is due to the split- 
ting of one of the two original 
cotyledons. 
The seedlings are gener- 
ally about 4-5 cm. long, and 
are very slender. There is no cotyledonary tube, and the transition is 
very similar to that described for Tridax procumbens , but of a much 
reduced type, the vascular bundles being very small. 
Diagram 9. Silybium Marianum. (For I, II, 
and III see Diagram 4.) 
Diagram 10. Dimorphotheca pluvialis. ‘Transition* in seedling with 3 cotyledons. (For 
description see text.) 
Seedlings with three cotyledons. A comparison of Diagram 8 with 
Diagram 10 will reveal the peculiar features of the transition in the 
