Dusén, ?Ark. Bot. 9(15) : 12. 1910.?, 1910.

Dusén, ?Ark. Bot. 9(5): 17. 1910.?, 1910.

Dusén, ?Ark. Bot. 9, no. 15: 14, pl. 3. 1910?, 1910.

Dusén, ?Ark. Bot. 9, no. 15: 15, pl. 4. 1910?, 1910.