I. Moraceae

Castilloa elastica, C. Markhamiana.

Ficus elastica, F. Vogelii and other species.

II. Euphorbiaceae

Hevea brasiliensis and other species. Manihot Glaziovii, M. dichotoma, m. heptaphylla, M. piauhyensis and other species.

Sapium Jenmani and other species.

Plate I

Fruits and Seeds of Rubber Plants

Photo H. F. Macmillan

III. Apocynaceae

Alstonia sp. Carpodinus sp. Clitandra sp.

Funtumia elastica, F. africana. Dyera.

Hancornia speciosa.

Landolphia Kirkii, L. Dawei, L. owariensis,

L. Heudelotii, L. Thollonii, etc. Leuconotis sp. Mascarhenasia elastica. Parameria glandulifera. Urceola esculenta. Willughbeia sp.

IV. Asclepiadaceae

Cryptostegia grandiflora. Raphionacme utilis.

V. Compositae

Parthenium argentatum.

American Species.