208 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Oxalis frutescens. VINAGRILLO. 
A low, tortuous shrub. (Stahl, 2: 170.) 
Oxalis martiana. See Oxalis corymbosa. 
Oxandra laurifolia. Haya BLANCA. 
An indigenous anonaceous tree, reported by Bello; also called ‘‘ yaya.” It 
reaches a height of 30 feet (9 meters), and fruits in January. (Stahl, 2: 28.) 
Oxandra virgata. HAYA PRIETA. 
An indigenous tree, originally described from Cuba. 
Pacholi. 
The strongly aromatic roots of a grass, perhaps Andropogon nardus, were on 
sale in small bundles in the market of Ponce. They are put in chests to keep 
out moths. 
Pachyrrhizus angulatus. YAM BEAN. FRIJOLILLO DE NAME. 
A shrubby, leguminous vine. having thickened horizontal roots, several inches 
in diameter, and 6 to 8 feet (2 to 2.5 meters) long. Although edible, these roots 
are inferior to the true yam ‘‘ cassava,’’ or ‘‘taro,’’ and when cooked they are 
said to resemble turnips in texture and taste. In some countries they form a 
resource in times of scarcity resulting from the failure of the usual crops. In 
Porto Rico this species was observed only in the vicinity of Rio Piedras, though 
it doubtless exists in other parts of the island. (Stahl, 3: 70.) 
Pachyrrhizus tuberosus. YAM BEAN. 
A leguminous vine with large edible roots; reported from Rincon 
Pacyrrizus angulatus. See Pachyrrhizus angulatus. 
Pajuil. See Anacardiwm occidentale. 
A tree from all parts of the island; height, 12 to 15 feet (3.5 to 4 meters); diam- 
eter, 9 to 10 inches (22 to 25 millimeters). Wood pinkish, soft; specific gravity, 
0.550; fruit tree. (Exp. 1857.) 
Palm. 
The palms thus far reported from Porto Rico are as follows: 
Phoenix dactylifera (date palm), Inodes causiarum (Porto Rican hat palm), 
Thrinax praeceps, Thrinax ponceana, Thrincoma alta, Thringis laxa, Thringis 
latifrons, Aeria attenuata (lame), Areca catechu (Betel nut palm), Roystonea 
borinquena (Royal palm), Acrista monticola (Palma de Sierra), Bactris acantho- 
phylla, Bactris pavoniana, Curima calophylla (coyure), Acrocomia media 
(corozo), Cocos nucifera, and Cocops rivalis. 
A synopsis of the above species appeared in the Bulletin of the Torrey Botanical 
Club for October, 1901. 
Palicourea barbinervis. 
Family Rubiaceae; reported from Lares and Anones. Bello gives the common 
name ‘‘tafetan.”’ 
Palicourea coccinea. 
Reported from Aibonito. 
Palicourea crocea. CACHIMBO. 
A biennial shrub, 1 to 2 meters high, found in waste places; known from 
Lares. (Stahl, 5: 77.) 
Wood light-colored, soft; specific gravity, 0.482; not used. (Exp. 1857.) 
Palicourea pavetta. 
A shrub 6 feet (1.8 meters) high; known from Juncos, on Mount Goyo. 
Palicourea umbellata. CACHIMBO VERDE. 
’ A biennial shrub, 1 meter high, found at the baseof mountains. (Stahl, 5: 78.) 
Palma christi. See Ricinus communis. 

