“Erythroxylon du Pérou, _Erythroxylon Coca_. _Erythroxylon foliis ovatis acutis subtrilincatis, ramulis crebre tuberculosis._ ‘Encyclopèdie Méthodique Botanique,’ tome ii. Lamarck. Paris: 1786, 393.” “Leaves alternate, 1½ to 2 inches long, membranous, flat, opaque, acute at both ends, the apex almost mucronate; quite entire, dark green above, pale beneath, 3-nerved in the middle, with fine connecting veins. Petiole 2-4 lines long, with a pair of intra-petiolary ovate-lanceolate brown acute stipules, upon the back of the outside of which, indeed, the petiole is articulated, and from which the leaf readily falls away, leaving the branches scaly with the persistent stipules. Flowers numerous, in fascicles from the branches where the leaves have fallen away, bracteated. Peduncles about as long as the flower, sharply angled. Calyx 5-cleft; segments acute. Petals alternate with the calycine segments, oblong, concave, wavy, with a lacerated and much plaited membrane arising from within and above the base. Stamens 10; filaments longer than the pistil, combined below into a rather short cylindrical tube. Ovary oval. Styles 3, about as long as the ovary. Stigmas thickened. Fruit a 1-seeded, oblong drupe, in a dry state obscurely furrowed. Nut of the same shape and furrowed. A powerful stimulant of the nervous system, affecting it in a manner analogous to opium. Less violent in its effects than that drug, but more permanent in its action.” The chromo-lithograph Frontispiece is from a water-colour, by Mr. J. Allen, of the plant in flower at Kew. 1. Sprig of Erythroxylon Coca. 2. Back of Leaf (full size). 3. Flower (enlarged). 4. Fruit.