This is a creeper, inhabiting the shores in the bay of Rio Janeiro. Its stem is herbaceous, rounded, covered with short and rather stiff hairs. Its leaves are simple, opposite, gradually tapering to a short channelled petiole adhering to that of the opposite side, and forming tufts at certain intervals whence arise adventitious roots. They have a smooth, trapezoid, coarsely intended limb. The flowers form little axillary heads, with from 15 to 20 flowers each, arising from an involucre with five divisions and supported by a somewhat filiform pedicle. Calix tubulous, monophyllous, with five teeth, and much shorter than the tube of the corol. The corol is monopetalous, of a yellowish white, tubulous, puffed up at its extremity, with five reflexed divisions, and five stamens with bilocular, connivent anthers which are longer than the corol. Ovary one-celled, flat at the top, whence proceeds a slender style, terminated by a glandular stygma which is longer than the stamens. Fruit monospermous, elongated, with a crustaceous integument which is covered with a number of stiff hairs that are bent over, and which presents irregular longitudinal furrows. The root is perennial and ramose. We employ the leaves. _First day._—1. Weakness of the joints of the lower extremities, immediately. Vertigo. Slight pain in the right side of the neck, for five minutes. Body and head are very warm. 5. Cold extremities. Violent sexual desire at 11, disappearing afterwards during the remainder of the day. _Second day._—Headache in the morning. Pain in the sides of the chest. Weakness of the lower limbs. 10. Aversion to every thing. Taciturn. Acute pain in the left ear, for some minutes. Hot face, with sickness at the stomach. Passing pain in the left arm. 15. Passing pain in the left lower limb, for ten minutes. Very drowsy after noon. Headache after a walk. Acute pain in the left lower limb, in the evening. In the evening, pain in the limbs. 20. Pain in the head. Internal heat. At night, very hot internally. Pulse hard and small. Passing and lancinating pains in various parts. 25. Lancinations in various parts of the head. Lancinating pain in the kidneys; the parts were all painful as if pricked. Pain at the right shoulder. Painful burning pricking at the right shoulder. Catarrhal sore throat. 30. Frequent and scanty flow of saliva. Passing pains at the neck. Constant pain in the head. Slight sense of heaviness at the stomach. Sense of chilliness at every motion. 35. Vertigo for 3 or 4 minutes, after eating. Heat in the eyes. Sensitive smell all day. Constant headache, especially in the forehead. Pain in the left lumbar region. 40. Heaviness of the head, with vertigo. Drowsy after 9. No stool, red urine.