BOOK-NOTES, NEWS, ETC. 115 
also of value for taxonomic purposes, each species being found to 
have a definite and characteristic tomentum. Two types of flower 
he 
Keuador to the Cordillera of Santiago in Chili, some species being 
found in the Cordillera of Western Argentina. Only two annual 
species are known. The vertical range of this genus lies between 
3900 and 5700 m. in Tropical South America, and is above 
2500 m. in Temperate South America. The highest recorded 
species are N. flabellata and N. Friesii, which have been found 
between 5600 and 5700 m. 
the same meeting a paper on the Longitudinal Symmetry 
of Centrosperme was read by Dr. Percy Groom. By means of 
