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Most massive = Giant Sequoias Sequoiadendron giganteum (Cupressaceae) …...

The conifers have the. Most massive = Giant Sequoias Sequoiadendron giganteum (Cupressaceae) …. ..The Tallest = Coastal Redwood (Sequoia sempervirens) (Cupressaceae) …. .. And the oldest = Bristlecone Pine Pinus longaeva (Pinaceae). Welwitschia mirabilis Welwitschiaceae young plant

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Most massive = Giant Sequoias Sequoiadendron giganteum (Cupressaceae) …...

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  1. The conifers have the Most massive = Giant Sequoias Sequoiadendron giganteum (Cupressaceae) …...

  2. ..The Tallest = Coastal Redwood (Sequoia sempervirens) (Cupressaceae) ….

  3. .. And the oldest = Bristlecone Pine Pinus longaeva (Pinaceae).

  4. Welwitschia mirabilis Welwitschiaceae young plant Note 2 strap-like leaves http://waynesword.palomar.edu/images/welwit3b.gif

  5. As Welwitschia grows the 2 leaves split into many sections. http://www.biosci.ohio-state.edu/~plantbio/images/greenhouseimages/welwitschia2.jpg

  6. Welwitschia is dioecious with separate male and female plants. Plant with female cones Plant with male cones

  7. 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

  8. Courtesy of Amy Dieckmann ‘05

  9. Escalante National Monument, Ephedra in the foreground http://www.ut.blm.gov/monument/Science_and_Research/pictures/ephedra.jpg

  10. Plant Male strobili (“cones”) Ephedra Female strobilus (“cone”) From Tree of Life Web Site, U. of AZ

  11. Gnetum, a woody plant with vessels

  12. Gnetophytes and Angiosperms have vessels. a. Longitudinal tracheid of pine. c. Hardwood fiber cell (provides support) b. Vessel of a hardwood (early wood) e. Trachied of a hardwood. c. Vessel of a hardwood (late wood)

  13. Anthophyte Hypothesis Gnetifer Hypothesis

  14. Two trees illustrating the Anthophyte vs Gnetifer Hypotheses Anthophytes (Extinct) (Extinct) Gnetifers

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