Monographs Details: Machaonia ottonis (K.Schum.) Urb.
Authority: Maguire, Bassett. 1972. The botany of the Guayana Highland--part IX. Mem. New York Bot. Gard. 23: 1-832.
Family:Rubiaceae
Description:Distribution and Ecology - Distribution. Dry hills of northern Venezuela, usually near the sea or in interior desert areas, at elevations below 400 m; also in eastern Colombia and the West Indies (Curacao; Bonaire).

Discussion:

Machaonia spinosa var ottonis Schum., Mart. FI. Bras. 6(6): 100. 1888.

Machaonia sulphurea Wernh., Jour. Bot. 51: 220. 1913.

Type. Region of Caracas and La Guaira, Otto 375.

Machaonia sulphurea Wernh., based on a specimen collected in Venezuela by Ernst, in no respect differs from M. ottonis. Wernham attempted to differentiate M. sulphurea on the basis of its densely hispidulous ovary covered with sulphur yellow hairs and small corollas with a tube 1.6 mm long and lobes 9 mm long. An examination of the type specimen from BM shows that the flowers are in an early stage of anthesis, therefore smaller than their normal flowering size, and can be matched by various collections of typical M. ottonis obtained in the same stage of early anthesis. Likewise, the ovaries in typical M. ottonis are as equally densely hispidulous as those of M. sulphurea.

Distribution:Venezuela South America| Colombia South America| West Indies| Curaçao South America| Bonaire South America|