146 
calyx and the remaining floral organs separate. This condition 
of the twin flowers evidentally arose from the longitudinal di- 
vision of the primordial initial cell, which gave rise to two dis- 
tinct ovaries with their accessory parts in place of the customary 
ovary. 
CARNEGIE MUSEUM 
PITTSBURGH, PENNSYLVANIA 
Another Catskill occurrence of Potentilla tridentata 
RAYMOND H. Torrey 
At least two occurrences, in the Catskill Mountains, of the 
Three-Toothed Cinquefoil, Potentilla (Sibbaldiopsis) tridentata, 
may now be recorded, where previously. there had been no record 
of the species in any catalogue of the flora of that region. Some 
time ago I stated in this journal that I had not found it on about 
twenty of the higher Catskills summits, although it is found on 
lower elevations in the same latitude or even farther south, such 
as Mount Beacon, 1640 feet on the Hudson opposite Newburgh, 
and on High Point, on Kittatiny Mountain, 1807 feet, in New 
Jersey; and at elevations of 4000 feet or higher, in Virginia and 
North Carolina. An occurrence at 4000 feet was also reported by 
Dr. R. L. Harper, I think, in Georgia. 
After my statement appeared, Mr. William Gavin Taylor, 
of Arlington, New Jersey, found the plant in 1930 on the top of 
the cliffs of Overlook Mountain, on the eastern front of the 
Catskills in Ulster County, northwest of Kingston, New York. 
It is a bleak, exposed place, such as the species likes, and it ap- 
peared that it flourished there, at about 3000 feet, even though 
not found as then supposed on other Catskill summits, a thou- 
sand feet higher, in the interior of the mountains, which are 
clothed with dense sub-alpine fir and spruce, and are more pro- 
tected than the Overlook cliffs. 
On Aug. 30, 1931, I found plenty of it, at several points, on 
the ledges along the trail north of the Catskill Mountain House, 
in Greene County, at elevations from 2000 to 2400 feet. With it, 
on one ledge was associated a large bed of Bearberry, Arctos- 
taphyllos uva-ursi, which is extremely rare in the Catskills, at 
least in the higher parts, where I have never seen it. Norman 
Taylor, in his catalogue of the flora of the vicinity of New York, 
a EREE 
