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Published byDinah Sanders Modified over 9 years ago
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Most massive = Giant Sequoias Sequoiadendron giganteum (Cupressaceae) …... The conifers have the
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..The Tallest = Coastal Redwood (Sequoia sempervirens) (Cupressaceae) ….
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.. And the oldest = Bristlecone Pine Pinus longaeva (Pinaceae).
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Welwitschia mirabilis Welwitschiaceae young plant Note 2 strap-like leaves http://waynesword.palomar.edu/images/welwit3b.gif
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As Welwitschia grows the 2 leaves split into many sections. http://www.biosci.ohio-state.edu/~plantbio/images/greenhouseimages/welwitschia2.jpg
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Welwitschia is dioecious with separate male and female plants. Plant with female cones Plant with male cones
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Welwitschia mirabilis can live for up to 2000 years by which time the two leaves have shredded into multiple straps. ttp://www.cactusandsucculent.org/riviste/2000/fascicolo-4/foto/welwitschia-mirabilis.jpg
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Courtesy of Amy Dieckmann ‘05
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http://www.ut.blm.gov/monument/Science_and_Research/pictures/ephedra.jpg Escalante National Monument, Ephedra in the foreground
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Ephedra Plant Female strobilus (“cone”) Male strobili (“cones”) From Tree of Life Web Site, U. of AZ
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Gnetum, a woody plant with vessels
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a. Longitudinal tracheid of pine. b. Vessel of a hardwood (early wood) c. Vessel of a hardwood (late wood) e. Trachied of a hardwood. c. Hardwood fiber cell (provides support) Gnetophytes and Angiosperms have vessels.
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Anthophyte Hypothesis Gnetifer Hypothesis
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Two trees illustrating the Anthophyte vs Gnetifer Hypotheses Anthophytes Gnetifers (Extinct)
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