Monocotylar dicotyledons

Dr Stephen L. Jury s.l.jury at READING.AC.UK
Tue Nov 21 14:58:50 CST 2000

There are also some Umbelliferae (= Apiaceae) with one cotyledon, including
Geocaryum, Bunium, Conopodium, Scaligeria and Erigenia. Lennart Engstrand
in his thesis "Biosystematics in  Geocaryum Cosson (Umbelliferae)" [Lund,
1977] reports these as being pseudomonocotyledonous and that this
phenomenon is also found in other families such as the Ranunculaceae,
Papaveraceae, Primulaceae, Portulacaceae, Celastraceae and Asteraceae (A.
Wisse, 1930. Blattstellungsstudien an Saemlingen abnorm keimender
Dikotylen. Beitr. Biol. Pfl. 18: 17--80). Engstrand suggests that the "most
probable theory is that the second cotyledon becomes totally reduced, which
is supported by anatomical features".
Dr Stephen L. Jury
Euro+Med Secretariat
Centre for Plant Diversity and Systematics
Plant Science Laboratories
The University of Reading
PO Box 221

email: s.l.jury at
tel. (0118) 931 8169, overseas +44 118 931 8169
Secretary (0118) 931 8160, overseas +44 118 931 8160
fax (0118) 975 3676, overseas +44 118 975 3676

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