270 Proceedings of hidmna Academy of Science 



was placed the air was caused to stream inwardly through the stomata 

 and out of the petiole continuously for two and one-half hours without 

 renewing the vacuum. 



AN UNUSUAL IRIS. 



F. M. Andrews, Indiana University. 



Two years ago I transplanted the rhizomes of some Irises to a rather 

 damp location. All were the common large blue flag {Iris versicolor) . 

 The rhizomes sent up the aerial parts and produced 60 flowers of which 

 three were unusually large, being 12 cm. long and nearly as broad, 

 whereas the usual length is 5 to 8 cm. This represents an increase in 

 size of at least one third. The inner segments were pure yellow and 

 only about one-half the length and breadth of the sepals. Ordinarily 

 the flowers of this species are colored yellow, green or white toward the 

 centei*^. The petals were marked in places by purple dots which recalled 

 to a degree the appearance of the flower of BcUoxcanda chinensis. The 

 rhizomes from which these three flowers above mentioned came bore in 

 every other instance blue flowers of the normal size and color. 



SECOND BLOOMING OF SNOWBALL BUSH IN THE 



SAME YEAR. 



F. M. Andrews, Indiana University. 



On September 4, 1922, the writer noticed an account of a .^^nowball 

 bush which was in bloom for the second time that year. The plant was 

 at the home of H. P. Carpenter of Elwood, Indiana, who, upon request, 

 very kindly forwarded to me a cluster of the flowers and a branch with 

 some leaves so that a study of the specimen could be made. He wrote 

 that "the first time it was in bloom the bu.sh was literally covered with 

 blossoms, but the last time there were only a few, probably a dozen 

 or more". This agrees with some other plants which have bloomed 

 more than once in a season and to which the author has previously made 

 reference'. The second blooming was conspicuous in specimens that were 

 more or less diseased, due apparently to the attack of fungi or other 

 injury. Injury may easily be caused by the attacks also of insects of 

 vai'ious kinds and the snowball is at times injured to a high degree by 

 this means. 



The characteristics of the specimens at hand agree with Viburmim 

 opulus or what is sometimes called the guelder rose or snowball. The 

 flowers are white and are borne in a long peduncled cyme about 6 cm. 

 in diameter. This however, falls far short of the usual size of the normal 

 cyme clusters of V. opidns which often average 12 cm. in diameter. 



' Gray, Asa. New Manual of Botany Seventh Edition. 



> Andrews, F. M. Proceedings of the Indiana Academy of Science 1905, pp. 187-188; 

 1909, pp. 373-374 ; 1911, pp. 279-281. 



