83 



2°. Tetramerous flower. One of the petals has on its left grown 

 together with an antisepalous stamen, while the antipetalous 

 stamens flanking the same have coalesced. 



BROMELIACEAE. 



Billbeiyia macrocalyx Hook. 

 Habitat Brazil. 

 Coll. Jnne 1896. 



Two antisepalous stamens have grown together with petals ; 

 one sepal partly petaloid. 



GRAMINEAE. 



Andropocjon procerus R. Br. 



Habitat Australia. 



Coll. ? 



The inflorescence shows median foliar prolification. 



Panicum spec. 



Habitat Java. 



Coll. November 1896. 



Median foliar prolification of the spikelets. 



Zea Mays L. 



Habitat trop. and temper, regions. 



Coll. Sept. 1897 by Dr. P. van Romburgh, culture garden at 

 Tjikeumeuh near Buitenzorg. 



On the male panicle there are female flowers to be found. 

 For this rather frequent aberration compare Penzig II p. J:59. 

 The different cases collected by Mr. Smith show that the trans- 

 formation of the d" panicle into the ? spadix presents all 

 degrees of transition, from a few odd grains which replace the 

 male flowers to quite large pieces of the axis and its branches. 

 The condensation of these parts and the dilatation of the sheaths 

 of leaves keep pace with one another. 



Imperata arundbiacea Cyr. 



