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224 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Urban describes a new variety, ciocarpum, from the south side of the island. 
Porophyllum ellipticum genuinum is also reported from numerous localities, and 
is identified with P. ruderale of Grisebach and Stahl, while the original Kleinia 
ruderalis of Jacquin is placed under a new variety, ruvderale of Urban. 
Porophyllum ruderale. See Porophyllum ellipticum. 
Portulaca oleracea. VERDOLAGA. 
The common purslane. 
Potamogeton pauciflorus. 
A very delicate, narrow-leaved species. Known from a river near Yauco. A 
coarser, undetermined species was collected by Sintenis in Lake Tortugero, near 
Manati. 
Potato. See Solanum tuberosum. 
Pothomorphe peltata. See Heckeria peltata. 
Pothomorphe umbellata. See Heckeria umbellatu. 
Prickly pear. See Opuntia. 
Primrose willow. See Jussiaea repens. 
Pringamoza. See Tragia volubilis, 
Priva echinata. PrRIVA ERIZADA, 
Family Verbenaceae; a slender, herbaceous annual, 50 centimeters high, grow- 
ng in stony places. (Stahl, 6: 204.) 
Priva erizada. See Priva echinata. 
Prosopis juliflora. Mersguir. 
This leguminous species is reported by Grisebach as being abundant in drv 
situations in Jamaica, where the name ‘* cashaw”’ is applied to it. 
Proustia krugiana. 
A climbing composite, 1 to 4 meters long, known from Coamo and Yauco. 
(Urban, Symb. 1: 471.) 
Prunus occidentalis. ALMENDRILLO. 
Family Rosaceae; a large tree, 15 meters high. The hard wood is used in mak- 
ing furniture. Flower and leaves have an odor of bitter almonds. Bello calls 
this tree ‘‘almendron.’’ (Stahl, 4: 68.) 
A wild tree, about 45 feet (13 meters) high, with a straight, rather long trunk 15 
to 18 inches (37 to 45 centimeters) in diameter, furnishing a much-valued wood, 
strong and elastic. This wood is of ordinary weight and is almost the color of 
light mahogany, and very similar to the cherry of Europe. Specific gravity, 
0,846, The wood is used in the country for the framework of houses, but it 
appears to us that it might be employed, like the cherry of Europe, for cabinet- 
work and the interior of houses. ( Grosourdy, 2: 361.) 
Pseudolmedia spuria. 
Family Moraceae; a high tree, known from Naguabo. 
Psidiastrum dubium. 
A myrtaceous shrub, described from the western coast of the island by Bello. 
Psidium guajava. GUAVA. GUAYAVA. 
Also called ‘‘ guayaba;"’ a bush or small tree of the family Myrtaceae, which 
bears the well-known edible fruit called *‘ guava” in English, and “ guayava ’’ in 
Spanish. 
The guava is perhaps the only fruit now existing on the island in quantities 
sufficiently large to make possible the early establishment of an industry based 
upon it. In some districts neglected land is covered for considerable distances 
with guava bushes, and there seems to be no reason why the manufacture of the 
justly celebrated guava jelly should not be undertaken on a considerable scale. 
