EMBRYOPHYTA SIPHONOGAMA 
Angiospermae 
MONOCOTYLEDONEAE 
Embryo with only one cotyledon. Stem consisting of bundles of vascular 
fibres. 
PANDANACEAE 
The family Pandanaceae is peculiar to the tropical regions of the old world, 
and is represented in America by the Cyclanthaceae. The Pandanaceae are 
especially rich in the Malayan region, in Micronesia, in Madagascar, Bourbon 
(Reunion) and Mauritius. Little is known about the distribution of this family 
in West Africa. The Pandanaceae are related to the Palms and Araceae. 
Here in Hawaii we have two species of two different genera which belong to 
this family. One is the well-known Hala or Puhala (Pandanus odoratissimus) 
and the other, the climber Freycinetia Arnotti or Ie ie. Only the former is here 
considered, being the only arborescent representative of this family. 
PANDANUS L. 
Erect trees or shrubs with simple or variously branched stems, mostly with 
aerial roots. Never climbers. Inflorescence often of immense size. 
The genus Pandanus, with its many species, is so far little known, owing to 
its dioecious character. In Hawaii there is only one species represented, which 
is however not peculiar to the islands, as it extends from Hawaii to the Sey- 
ehelle Islands and Arabia. 
In German New Guinea eleven species have been found so far, six of which 
are endemic. 
Pandanus odoratissimus L. has been sunk by Warburg and made a synonym 
of P. tectorius; which he records as oceurring in ‘‘ Hawai.’’ On the same page 
he creates a variety y. sandvicensis from the Sandwich Islands. Prof. War- 
burg evidently regards Hawai and the Sandwich Islands as two different 
groups, and it is possible that his variety came from the higher levels, whence, 
of course, it would differ somewhat from the tree found on the shores, where 
they are exposed to the salt air; while the higher altitude (1800 feet), larger 
precipitation, wind, ete., would undoubtedly cause some differentiation, which 
would not, however, warrant the creation of a new variety. On the strength of 
this, the name Pandanus odoratissimus is here retained. The genus consists of 
about 156 species. 
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