KNOX 



PLATE III 



OENOTHERA CRUCIATA. I. Young protuberance. 2. "Stung tip." 3. Old 

 protuberance and bifurcation with one fasciated branch. 4. Protuberances asso- 

 ciated with the flattening of the stem. 5. Protuberance surrounded by fascia- 

 tions. 6. Early stage in the formation of a protuberance. 



