GRIFFITHS: ADDITIONAL SPECIES OF OPUNTIA 531 
with subcircular areoles 3 mm. in diameter, the upper especially 
with prominent spicules 3-4 mm. long, merging imperceptibly 
ong the delicate, fugacious spines which may be a cm. long or 
ess. 
This species was received from the Royal Botanical Garden at 
Berlin as Opuntia Bergeriana A. Weber, and has been grown with 
us in two situations in Texas and one in California. In some re- 
spects the plant does suggest Opuntia Bergeriana but the character 
of the flowers alone would exclude it from that species. It differs 
also in general habit, nature of spination and form and character of 
joints. In the season of 1914 our plants at Chico, California, 
blossomed profusely and set a good crop of fruit, but in no case 
did any seed form, the fruit being made up mainly of rind with a 
very small, empty seed cavity, save for the minute dried ovules. 
In 1915, however, the earlier fruits did not differ very materially 
from those of the previous year except that two or three seeds 
were produced in the fruit; but later crops, blossoming in late 
June and early July, produced an abundant seed crop. The 
species is carried in our collections under No. 2825 S. T. G. Its 
habitat is not known. 
UNITED STATES DEPARTMENT OF AGRICULTURE 
Explanation of plate 30 
OPUNTIA LONGICLADA Griffiths 
Terminal joints and flower buds, about half natural size, cultivated at Chico, 
California, 
