

62 SHADE IIS" COFFEE CULTURE. 



without further demonstration, particularly in view of the fact that the Euphorbiace- 

 ous trees are generally known to make serious demands upon the soil and to permit 

 little or nothing to grow under them. The indications are rather that the planta- 

 tions had been too heavily shaded under Erythrina and appeared at first to profit 

 by the change. 



The sand-box tree is commonly planted for shade along the highways in Porto 

 Eico. The hurricane of August, 1899, injured it badly, though not to the same 

 extent as the Erythrinas. 



The trunk suggests that of the Ceiba, having prominent roots, large stout spines, 

 and a similar light-gray color. The habit of the branches is different, however, and 

 the leaves are simple and cordate instead of palmately compound. They are also 

 peculiar in having unusually numerous white veins. 



The slightly milky juice is acrid and irritant, while the seeds are sometimes used 

 as a purgative. An oil expressed from them is said to be less nauseous than castor 

 oil, and to be effective in smaller doses. The fruits of the Porto Rico trees were 

 much less prominently ribbed than those figured in botanical works; possibly it 

 represents a distinct species. 



Hypaphorus subumbrans. (See Erythrina lithosper?jia, also Ery- 

 thrina siibumhrans.) 



Immortel. (See Erythrina umhrosa.) 



Immortel jaune (Guadeloupe). (See Erythrina jjoeppigiana.) 



Indian corn. (See Zea mays.) 



Indian mulberry. (See Moras indica.) 



Indian nettle tree (British India). (See Trema orientalis.) 



Indigo. (See Indigofera.) 



Indigofera. Indigo. 



The planting of indigo as a soiling crop with coffee is suggested by Lecomte. 



Inga dulcis. 



Common name. — Pois doux (French Antilles). 

 Raoul reports the use of this species as a windbreak in the "West Indies; accord- 

 ing to Guerin, who gives the same common name, I. laurina is used for the same pur- 

 pose in Guadeloupe. The Index Kewensis gives Inga dulcis as a synonym of Pithecolo- 

 bium dulce, but this can hardly apply to the present instance. 



Inga inicuil. 



Synonym. — Inga jiniquil. 



Common names. — Inicuil; Jinicuile. 

 According to Mr. 0. W. Barrett, the iniquil is preferred for coffee shade in the region 

 of Vera Cruz, Mexico. In the Biologia Centrali Americanae this species is said to be 

 both indigenous and cultivated about Jalapa, It is also mentioned by Herrera as 

 considered desirable for coffee shade in the region of Cordoba, Mexico. 



Inga jiniquil. (See Inga inicuil.) 



Inga laurina. (See PI. XIV.) 



Common names.- — Guamo, orGuama (Venezuela, Porto Rico); Pois doux (Guade 

 loupe) . 

 According to Guerin, this tree is one of those employed in the cacao culture of 

 Guadeloupe in making hedges or windbreaks which are planted across the direction 







