http://www.biodiversitylibrary.org/
Bulletins de l'Académie royale des sciences, des lettres et
des beaux-arts de Belgique.
Bruxelles.
http://www.biodiversitylibrary.org/bibliography/5550
ser.2:t.37 (1874):
http://www.biodiversitylibrary.org/item/107301 Page(s): Page 651, Page 652, Page 653Contributed by: Missouri Botanical Garden, Peter H. Raven Library Sponsored by: Missouri Botanical Garden
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