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country, ‘‘ huariqui” (/éervzllea sonorae); during the rainy 
season green stems arise from these large woody plant-bodies, 
which at other times remain in a resting condition. 
A group of the lily family will be found in the central 
portion of this house. This comprises members of the genera 
Aloe, Yucca and Dasylirion. A group of cacti will also be 
found here, the most imposing figure of which is the giant 
cereus, Cereus giganteus, known as ‘‘suwarro” by the Mexi- 
cans and Indians of its native country, Arizona and Sonora. 
The plants here shown were obtained by an expedition sent 
to those regions by the Garden in 1902, and they represent 
perhaps the largest specimens in cultivation in the east. 
Several large specimens of: the hedgehog cactus, secured at 
the same time, form part of this group. The Indians in 
the desert often secure a supply of drinking water from these 
plants by cutting off the top and macerating the interior 
substance. A number of other large and rare cacti secured 
by a Garden expedition of 1906 have recently been added to 
this collection. On the remaining corner benches will be 
found the fig marigolds, from southern Africa, desert mem- 
ouse Wo. 7. Many families are shown here, the repre- 
sentatives of which are tropical. ‘The members of the mimosa 
and senna families, largely represented in this house, are 
curious in their sleep movements; as daylight wanes the 
leaves begin to droop and the leaflets to fold up. Belong- 
ing to the senna family may be mentioned: the logwood tree 
(Haematoxylon campechianum), widely distributed through- 
out tropical America; the copaiba tree (Copazva officcnalis), 
one of the trees from which copaiba is obtained; and the 
tamarind tree (Zamarindus cndica), valuable for its fruit. In 
the mimosa family the humble or sensitive plant (AZimosa 
pudica), whose leaves fold at the least touch, is of peculiar 
interest. The mahogany tree (Swzetenta Mahagonz), and the 
cocaine plant (Zrythroxylon Coca), from South America, are 
important economic plants. In the custard-apple family are 
