MACKENSEN: TWO NEW SPECIES OF OPUNTIA 143 
pink to rose purple outer layer, and a nearly colorless, pleasant- 
tasted pulp: seeds suborbicular, relatively thick (4 mm. long, 2.5 
mm. thick), dirty yellow, with grayish areas on the flat sides, the 
margin thin and whitish at the raphe. 
Flowering in May, the fruit ripening in August and September 
and not proliferous. : 
The flowers and fruit of this species show a close relationship 
to Opuntia macrorhiza, but the decided differences in habit, spines, 
and bristles, and the numerous minor differences, are sufficient 
justification for regarding it as a distinct species. 
The description was drawn from plants growing in their native 
habitat at Kerrville, Texas,in May, 1910. At the same time a 
number of plants were transported to San Antonio, Texas, and 
replanted, and from these the type material was chosen in October 
of the same year. The type is no. 618290 in the U. S. National 
Herbarium. 
The species is named in honor of Dr. J. N. Rose of the United 
States National Museum. 
San ANTONIO, TEXAS. 
