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

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Presentation on theme: "Most massive = Giant Sequoias Sequoiadendron giganteum (Cupressaceae) …... The conifers have the."— Presentation transcript:

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

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

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

8 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

9 Courtesy of Amy Dieckmann ‘05

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

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

12 Gnetum, a woody plant with vessels

13 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.

14 Anthophyte Hypothesis Gnetifer Hypothesis

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


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