De CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
These plants have as yet little importance, and are not to be confused with the 
African rubber vines belonging to the apocynaceous genus Landolphia. 
Rubia. See Fagara monophylla. 
Rubial. 
A tree growing near the sea at the east end of the island; natives secure a dye 
from it, and the wood makes very pretty sticks; specific gravity 0.55. (Hansard.) 
Ruda. See Ruta chalepensis. 
Rudolphia volubilis. BEsUucO COLORADO. 
Family Viciaceae; a dark red woody vine, with a rough bark; grows in high 
altitudes and flowers in winter. Said to be known only from Porto Rico and 
Mexico. Called ‘‘ bejuco prieto”’ by Bello. (Stahl, 3: 90.) 
Ruellia coccinea. YERBA MARAVILLA. 
Family Acanthaceae; an erect woody annual, 1 meter high, found in moist 
shady places in the mountains. (Stahl, 6: 242.) 
Ruellia tuberosa. 
A woody herb, 50 centimeters high; grows in dry sandy places along the coast. 
(Stahl, 6: 240.) 
Rumex crispus. Dock. VINAGRILLO. 
A cosmopolitan weed belonging to the family Polygonaceae; reported from near 
Maricao. 
Russellia juncea. LLuvir. 
Family Scrophulariaceae; a tall, slender herb, cultivated for its handsome 
tubular red flowers. Our specimen is from Santurce. 
Ruta chalepensis. RuE. Rupa. 
Family Rutaceae; introduced from the Mediterranean region; collected near 
Mayaguez, by Krug. 
Rynchosia. See Dolicholus. 
.Sabal blackburniana. See Inodes blackburniana. 
Sabicea aspera. SABICEA PELUDA. 
Family Rubiaceae; a woody biennial, 2 to 3 meters high; found in the cool 
shade of the mountains. Stahl has two species, S. hirsuta and S. hirta, which, 
according to the Index Kewensis, are synonyms of S. aspera. (Stahl, 5: 44-45.) 
Sabicea hirsuta. See Sabicea aspera. 
Sabicea hirta. See Sabicea aspera. 
Sabicea peluda. See Sabicea aspera. 
Sabinea florida. RETAMA. 
Family Viciaceae; a shrub 2 to 3 meters high, found in waste places and along 
banks of rivers. Flowers in February and March. Common to all the Antilles. 
(Stahl, 3: 32.) 
Sabinea punicea. CARACOLILLO. 
A leguminous plant, supposed to be a shrub. Known from mountain slopes 
near Mayaguez and Maricao. 
Sabino. See Magnolia splendens. 
This name is given by Hill in a list of trees of the mountains. According to 
Captain Hansard it is never used alone but always in the form of ‘‘ laurel sabino,”’ 
which is believed to be the same as *‘ laurel amarillo.” 
Sabo. See Feviilea cordifolia. 
Sacabuche angulosa. See Physailis angulata. 
Sacabuche peludo. See Physalis pubescens. 
