A natural hybrid of Coffea racemosa Lour. (2n= 22) and C. arabica L. (2n= 44) is triploid (2n= 33), intermediate in many characteristics between both species and highly sterile. Frequency of trivalents is smaller in the racemosa than in the canephora hybrid; bivalents, however, are more frequent in the racemosa hybrid. Other observations on mierosporogenesis are presented and discussed. New hybrids including other species should be obtained and studied before a definite conclusion be drawn as to taxonomical relationships of Coffea species.