COOK AND COLLINS—ECONOMIC PLANTS OF PORTO RICO. 165 
Icaco. See Chrysobalanus icaco. 
Icaque. See Chrysobalanus icaco, 
Tleucedran. 
Enumerated by Hill among forest trees yielding timber and fuel, but the name 
is admitted to be doubtful and seems not to have been printed elsewhere. 
Ilex. 
A large genus of Aquifoliaceae, including many West Indian shrubs and trees; 
several of the latter are called by.the natives ‘* cuero de sapo,”’ but J. macoucoua 
and J. ridlaei have no local names reported. 
Ilex dioica. CUuERO DE SAPO. 
A shrub, 83 to 5 meters high, found in the mountains and waste places; also 
called ** brigueta.”’ (Stahl, 4: 36.) 
Ilex macoucoua. BRIGUETA NARANJO, 
A shrub, 3 to5 meters high, found in waste places and in the mountains. (Stahl, 
4: 35.) 
Ilex nitida. 
According to Urban (Add. 1: 35) variously known in Porto Rico as ** cuero de 
sapo,”’ ‘‘ palo de hueso,”’ and ‘* hueso prieto.’’ Reported from Bayamon, Sierra de 
Luquillo, Hato Grande, Cayey. Aibonito, Adjuntas, and Lares, in ‘* coffee forests. ”’ 
Also known from Jamaica, Montserrat, and Martinique. 
Ilex sideroxyloides. GoNnGouin. 
A large tree reported from the Luquillo Mountains. There are two varieties, 
portoricensis and occidentalis. (Urban, Add. 1: 32.) 
Tlex urbaniana. CUERO DE SAPO. 
A tree reported from primeval forest at Mameyes, near Utuado. (Urban, Add, 
1: 33.) 
Ilysanthes gratioloides. See Ilysanthes riparia, 
Ilysanthes riparia. YERBA GRACIOSA. 
Family Scrophulariaceae; a procumbent herb growing in wet places. (Stahl, 6: 
236.) 
India rubber vine. 
See note under ** rubber vine.” 
Indian almond. See Terminaliau catappa. 
Indian corn. See Zea mays. 
Indian creeper. See Yuamoclit quamoclit, 
Indian pink. See Quamoclit quamoclit. 
Indian shot. See Canna. 
Indian sorrel. See Hibiscus sabdariffa. 
Indigo. See Jndigofera anil. 
Indigo berry. See Randia aculeata. 
Indigofera anil and I. tinectoria. InNpiGco. ANIL. 
An annual or biennial leguminous shrub very common as a weed in waste 
places at low elevations in Porto Rico. Many species of plants are now known 
to produce indigo, but the species of Indigofera are preferred. In India /. tine- 
toria is generally cultivated, while in the American tropics /. anil is believed to 
have been much more commonly used. Careful comparative experiments regard- 
ing the value of these and other indigo-yielding plants seem not to have been 
made. Many of these could undoubtedly be grown successfully in Porto Rico, 
but unless improvements in the methods of manufacturing can be made it is not 
likely that there could be successful competition with the East Indies, whence 
