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.3:t.3 (1882):
http://www.biodiversitylibrary.org/item/111467 Page(s): Page 278, Page 279, Page 280, Page 281, Page 282, Page 283, Page 284, Page 285, Page 286, Page 287, Page 288, Page 289, Page 290, Page 291, Page 292, Page 293, Page 294, Text, Illustration, Page 295, Page 296Contributed by: Missouri Botanical Garden, Peter H. Raven Library Sponsored by: Missouri Botanical Garden
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