The New Encyclopædia Britannica, Volume 19Encyclopaedia Britannica, 1981 - Encyclopedias and dictionaries |
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Page 520
... genera , 35 are restricted to the Northern Hemisphere and 20 to the Southern . Three genera of cycads ( Cycas , Macrozamia , and Zamia ) , the joint firs , the gnetums , and seven genera of conifers ( Agathis , Dacrydium , Juniperus ...
... genera , 35 are restricted to the Northern Hemisphere and 20 to the Southern . Three genera of cycads ( Cycas , Macrozamia , and Zamia ) , the joint firs , the gnetums , and seven genera of conifers ( Agathis , Dacrydium , Juniperus ...
Page 578
... genera , and about 80 to 150 species . Knowledge is still very incomplete concern- ing several genera ; thus the actual number of species remains uncertain . The families and most of the genera are isolated both morphologically ( i.e. ...
... genera , and about 80 to 150 species . Knowledge is still very incomplete concern- ing several genera ; thus the actual number of species remains uncertain . The families and most of the genera are isolated both morphologically ( i.e. ...
Page 579
... genera Corylopsis , Hamamelis , Liquidambar , and Parrotia . Some other fossils have been described as separate genera ; the oldest ones from the European Eocene are Hamamelidanthium and Stein- hauera . The oldest remains of Platanus ...
... genera Corylopsis , Hamamelis , Liquidambar , and Parrotia . Some other fossils have been described as separate genera ; the oldest ones from the European Eocene are Hamamelidanthium and Stein- hauera . The oldest remains of Platanus ...
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