AT 
central bench across the walk. The central bench also accom- 
modates the large collection of the liliaceous genus Aloe, mainly 
African in distribution, the fleshy spurges, the bromeliads, and 
a single genus of the cactus family, Hylocereus, one of the climbing 
groups of that large family, to which belong some of the plants 
commonly known as ‘‘night-blooming cereus.” 
In house no. 6 are assembled the collection of century plants, 
Agave, and other amaryllidaceous species, and such other plants, 
too Jarge for incorporation in their proper places in the other 
houses. The dracaena family is also well represented here by 
Yucca and Beaucarnea. Here will be found the large cactus, 
Carnegiea gigantea, and other columnar cactuses, also a number of 
large specimens of the hedgehog cactus, Echinocactus. 
In houses 7 and 8 are the true cactuses. It is interesting to 
note that all the members of this family, with a very few excep- 
tions in Africa, are truly American plants. In house no. 7 are 
the Cerioideae, including, on the central bench, such genera as 
Pachycereus, Lemaireocereus, Cephalocereus, and other columnar 
forms; the climbing and slender columnar forms, represented by 
such genera as Selenicereus and Nyctocereus; the leaf-cactuses, 
Epiphyllum, with also a group on a side end-bench; and speci- 
mens of the hedgehog cactus, Echtnocactus, the Turk’s-head cac- 
tus, Cactus, and such genera as Echinopsis, Anhalonium, Echino- 
cereus, and the odd Leuchtenbergia. 
On the north bench are others of columnar habit, mainly of the 
genus Cereus, while on the south bench are the odd mamillate 
cactuses, known for many years as Mamullaria. Hanging over 
the walks is a large collection of Rhipsalis and Hariotea. One of 
these with round stem and branches and white berries is known 
as the mistletoe cactus. 
In house no. 8 are the Opuntioideae and the Pereskioideae. 
The greater part of the plants here belong to the first tribe, and 
represent such genera as Opuntia, Nopalea, and Pereskiopsis, 
the latter with large well-developed leaves. There are many 
representatives on the south bench of the round-stemmed 
opuntias, known as cylindro-opuntias, and on the other benches, 
still more of the flat-stemmed forms known as platyopuntias. 
