by Westman, A.L, Levy, B.M, Miller, M.B, Gilles, G.J, Spira, T.P, Rajapakse, S, Tonkyn, D.W, Abbott, A.G
Published in Acta horticulturae (01.01.2001)

by Spira, T.P
Published in American journal of botany (01.03.1980)

by Snow, A.A. (Ohio State University, Columbus, OH.), Spira, T.P
Published in Evolution (01.10.1996)

by Snow, A.A. (Ohio State University, Columbus, OH), Spira, T.P
Published in American journal of botany (01.02.1993)

by Wagner, L.K, Spira, T.P
Published in The American midland naturalist (01.01.1994)

by Spira, T.P, Wagner, L.K
Published in American journal of botany (01.02.1983)

by Snow, A.A. (Ohio State University, Columbus, OH), Spira, T.P
Published in American journal of botany (01.10.1991)

by Spira, T.P
Published in Madroño (01.10.1987)

by Spira, T.P. (Smithsonian Environmental Research Center, Edgewater, MD), Snow, A.A, Whigham, D.F, Leak, J
Published in American journal of botany (01.04.1992)

by Spira, T.P, Pollak, O.D
Published in American journal of botany (01.01.1986)