Werderm., ?Notizbl. Bot. Gart. Berlin-Dahlem 12: 92. 1934.?, 1934.

Werderm., ?Notizbl. Bot. Gart. Berlin-Dahlem 12: 93. 1934.?, 1934.

Werderm., ?Notizbl. Bot. Gart. Berlin-Dahlem 12: 90. 1934.?, 1934.

Werderm., ?Notizbl. Bot. Gart. Berlin-Dahlem 12: 91. 1934.?, 1934.