Dr. Engelmann on the Cereus giganteus of California. 5 
and even the free upper part of the ovary. In all the Cerei and 
Echinocacti examined by me, I find the lowest part of the tube 
free, the filaments being adnate to some distance above the ovary. 
It is not improbable that the Chilian velvety Cerei ( Velutini , Pr. 
Salm.) are to be classed near our species. The flower of what 
appears to be Cereus Chilensis, Pfr., obtained near Valparaiso, and 
figured by the artist of the U. S. Exploring Expedition, greatly 
resembles that of C. Thurberi: it is a little larger, but has 
the same shape, and the same closely imbricated sepals on the 
ovary ; the tube has about 100 sepals, and the white petals are 
acute ; whether fleshy or not is uncertain. 
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