Abdallah, R.A. (fl. 1990) (co-collector)
Bayona, W. (fl. 1999-2001) (co-collector)
Bidgood, Gillian Sally (1948-) (co-collector)
Congdon, T.C.E. (fl. 1986-2001) (co-collector)
Ensermu Kelbessa (1952-) (co-collector)
Festo, Lenin (fl. 2001-2006) (co-collector)
Friis, Ib (1945-) (co-collector)
Getachew Aweke (1937-) (co-collector)
Ghogue, Jean-Paul (1962-) (co-author)
Gilbert, Michael George (1943-) (co-collector)
Harvey, Yvette (Tivvy) Berenice (1966-) (co-collector)
Hassan, Abdisalam (fl. 1987-1996) (co-collector)
Leliyo, G. (fl. 1990-2000) (co-collector)
Malombe, I. (fl. 2006) (co-author)
Mbago, Frank Mgalla (1963-) (co-collector)
Mboya, E. (fl. 1996-2004) (co-collector)
Mesfin Tadese (1951-) (co-collector)
Mungai, G.M. (fl. 1979-2007) (co-collector)
Mwachala, Geoffrey (1965-) (co-author, co-collector)
Mwasumbi, Leonard B. (1938-) (co-collector)
Pócs, Tamás (1933-) (co-collector)
Rasmussen, Finn Nygaard (1948-) (co-collector)
Rodgers, W.A. (fl. 1980-1999) (co-collector)
Sebsebe Demissew (1953-) (co-collector)
Sitoni, D.K. (fl. 1997-2000) (co-collector)
Whitehouse, Chris (fl. 1996-2007) (co-collector)
Zerihun Woldu (fl. 1982-2004) (co-collector)