共 9 条
[1]
COE HS, 1920, 844 US DEPT AGR B
[2]
HAMLY D. H., 1935, Botanical Gazette, V96, P755, DOI 10.1086/334521
[4]
HYDE E.O.C., 1954, ANN BOT, V18, P241
[5]
KUHN O, 1925, KUHN ARCHIV, V9, P332
[6]
LUTE AM, 1928, 326 COL AGR EXPT STA
[7]
Martin J. N., 1944, IOWA STATE COLL JOUR SCI, V18, P457
[8]
Pammel LH., 1899, T ACAD SCI ST LOUIS, V9, P91