共 4 条
[1]
HILDEBRAND F, 1866, BOT Z, V24, P75
[2]
PIPER CV, 1914, B USDA, V75
[3]
ROBERTS HF, 1916, Q REPT KANS STATE BO, V35, P180
[4]
URBAN I, 1873, VERH BOT VER BRANDEN, V15, P13