Nov. 4, 1923 COOK: PSEUDOPHOENIX INSIGNIS 397 
iodide. This study of lithium iodide thus seems to be another 
example of the difficulties that arise from the use of the unaided 
powder diffraction technique in the determination of the structures 
of even simple crystals. Additional experimental data obtained by the 
present writers in a previous determination of lithium iodide are 
included. It is also pointed out that the intensities of the powder 
lines from rubidium fluoride and the distances between fluorine and 
rubidium atoms are not in agreement with those to be expected from 
the structure which has been given to this crystal. 
TABLE III.—Intensity Data uron RuBiIDIuM FLUORIDE 
INTENSITY 
INDICES 
Observed Calculated 
100(1) - 10 10 
110(1) 8 97.5 
111(1) 2 a 
100 (2) 1 6.2 
110(2) 0.75 5.4 
111(2) Absent 2.2 
120(1) 3 6.1 
112(1) 1.5 15.5 
Note: Only intensity calculations upon the more important reflections are repro- 
duced in Tables II and III. 
BOTAN Y.—Pseudophoenix insignis, a new palm from Haiti, and two 
other new species from the West Indies. O. F. Coox, Bureau 
of Plant Industry. 
The generic type is Pseudophoenix sargentit Drude, a native of the 
Florida Keys. The genus has been considered as monotypic and is 
without any close relatives, so that it has been placed in a separate 
family, Pseudophoenicaceae. Even in the wider sense of family 
relationships, the Pseudophoenicaceae apparently are not allied to 
any North American palms, but may have remote affinities with the 
ivory palms and wax palms of South America. Hence the finding 
in Haiti of a new species of Pseudophoenix, of much greater size than 
the Florida species and with other distinctive characters, seemed 
worthy of note. 
The Haitian Pseudophoeniz is a large palm that grows abundantly 
in dry open forests of limestone mountains in the district of Gonaives, 
in the northwestern part of Haiti. It is much larger and more 
attractive in appearance than the Florida species, having a massive, 
vase-formed trunk attaining a height of 10 meters or more, leaves and 
