It rained heavily through the night, and in the morning, hearing from Martinez that the varieties of _C. ovata_, the collection of which had been recommended to me by Dr. Weddell, were only found in a zone at a much greater elevation than that of the _C. Calisayas_, I devoted the day to a search in an almost vertical direction, on the north-east side of the Yana-mayu, towards some heights called Pacchani. Ascending the steep sides of the ravine of Yana-mayu for about two hundred feet, we reached a narrow level shelf covered with ferns and the huge leaves of the _sayal_ palm. The locality was very damp and shady, and the _C. micrantha_, _Huiñapu_, and _Cascarilla Carua_ were in great abundance. We continued to ascend through the forest which covered the sides of the steep mountain, for several hours continuously; the footing consisting of decayed leaves and rotten trunks, moss and ferns covering every tree, and all the vegetation intensely humid. At a height of 750 feet above the river we came to some trees of the _beno-beno_ (_Pimentelia gomphosia_,[337] Wedd.), with its bright laurel-like leaves and minute capsules; the _C. pubescens_, called by Martinez _cascarilla amarilla_, still only in bud, which was very abundant; and large trees of the _morada naranjada_ (_C. ovata, var. α vulgaris_, Wedd.). Near this place a troop of about twenty monkeys went chattering along the tops of the trees, and while I was looking at them a huge black hornet rushed up out of the moss and stung me on the chin. These savage creatures make their nests under the earth, and are called _huancoyru_.