.. And the oldest = Bristlecone Pine Pinus longaeva (Pinaceae). Welwitschia mirabilis Welwitschiaceae
young plant Note 2 strap-like leaves http://waynesword.palomar.edu/images/welwit3b.gif
As Welwitschia grows the 2 leaves split into many sections. http://www.biosci.ohio-state.edu/~plantbio/images/greenhouseimages/welwitschia2.jpg Welwitschia is dioecious with separate male and female
plants. Plant with female cones Plant with male
cones 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
Courtesy of Amy Dieckmann 05 Escalante National Monument, Ephedra in the foreground Plant Male strobili (cones)
Ephedra Female strobilus (cone) From Tree of Life Web Site, U. of AZ Gnetum, a woody plant with vessels
Gnetophytes and Angiosperms have vessels. a. Longitudinal tracheid of pine. b. Vessel of a
hardwood (early wood) c. Vessel of a hardwood (late wood)
c. Hardwood fiber cell (provides support) e. Trachied of
a hardwood. Anthophyte Hypothesis Gnetifer
Hypothesis Two trees illustrating the Anthophyte vs Gnetifer Hypotheses Anthophytes (Extinct)
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