1907]  Robinson,— Scientific Name of the Osage Orange 91 
way much of the original color remains in some species; others obsti- 
nately persist in turning black when drying. The different behavior 
of plants apparently quite similar led me to make some experiments 
last November, which gave me new light on the question. I found 
most beautiful plants of the delicate Callithamnion of a most brilliant 
rosy color growing in deep water on the reef at Woodmont, and was 
much disappointed to find them losing their color in drying. I had 
used sometimes the city water and sometimes water from the shallow 
wells of the region in mounting, and I found a slight difference in 
favor of the city water; I then experimented with rain water, with 
marked success. It was evident that the mineral dissolved in the 
ordinary water was sufficient to destroy the color in drying. 
The rocks on which the seaweeds grow at South Beach are red 
granite. The beach contains a large amount of red sand, sufficiently 
heavy to be easily separated from the quartz sand by washing. A 
superficial examination seems to show zircon and garnet, and a 
mineralogist to whom I sent a sample said that it contained about 
two per cent of monazite. The rocks on which the red Dasya grows 
at Fort Hale are trap. The purple Dasya at Woodmont grows on a 
curious shale or slate, that suggests the vicinity of magnesian lime- 
stone. It is penetrated by fresh water springs from the mainland, 
the water containing iron and lime. 
THE SCIENTIFIC NAME OF THE OsAGE ORANGE.— The Osage 
Orange, although it has borne in the past a variety of scientific names, 
appears to have no designation which is in accord with the Vienna 
Rules. These legitimize the generic name Maclura of Nuttall but 
necessitate the restoration of the earlier specific name of Rafinesque. 
The needed binomial and its synonymy are as follows:— 
Maclura pomifera (Raf.), n. comb. 
Ioxylon pomijerum Raf. Am. Monthly Mag. ii. 118 (1817). 
Maclura aurantiaca Nutt. Gen. ii. 233 (1818). 
Broussonetia tinctoria Spreng. Syst. iii. 901 (1826) in part, not 
HBK. ; 
Toxylon aurantiacum Raf. Med. Fl. ii. 268 (1830). 
T. Maclura Raf. New Fl. N. A. iii. 43 (1836). 
Toxylon pomiferum Sarg. Silv. vii. 89 (1895). 
B. L. Rosinson. 
