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Psidium rufiim, Martius. 
Brazil, in the province Minas Geraes, on sub-alpine heights. 
This Guava-hush gains finally a height of 10 feet, and is 
likely the hardiest of all the species, producing palatable 
fruit. 
Ptychosperma Alexandrae, B. v. Mueller. 
The Alexandra Palm. Queensland, as well in tropical as 
extra-tropical latitudes. The tallest of Australian Palms, 
and one of the noblest form in the whole empire of vegeta- 
tion. It exceeds 100 feet in height, and is likely destined 
to grace any shady moist grove free from frost in this and 
other countries, as it seems less tender than most palms. 
The demand for seeds has already been enormous. 
Ptychosperma Cunninghami, Wendland. 
East Australia, as far south as Illawarra ; thus one of the 
most southern of all palms. This also is a very high species, 
destined to take here a prominent position in decorative 
plantations. Several species occur in Peegee and other 
islands of the Pacific Ocean, and again others might be 
obtained from India, but they are probably not so hardy as 
ours. Though strictly speaking of no industrial value these 
palms are important for horticultural trade, and are objects 
eminently fitted for expexdments in acclimation. 
Ptychosperma elegans, Blume. 
(P. Seafortliia, Miq. Seaforthia elegans, E. Br.) 
Litoral forests of tropical Australia. Also a lofty magnifi- 
cent Feather- Palm. Its leaflets are erose. It may prove 
hardy. 
Pycnanthemum incanum, Michaux. 
North America. A perennial herb, in odor resembling both 
Pennyroyal and Spearmint. It likes to grow on rocky 
woodland, and on such it might be easily naturalized. 
Pycnanthemum montanum, Michaux. 
The Mountain- Mint of North America. A perennial herb 
of pleasant aromatic mint-like taste. These two particular 
species have been chosen from several North American 
