Gnetales

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Gnetales

• Ephedra (Mormon Tea)
• Welwitschia
• Gymnosperms with vessels

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Ephedra viridis (mountain joint-fir or Mormon Tea)
http//www.nazflora.org/Ephedra20viridis20branch
ing20habit.jpg
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Ephedra sinica (Ma Huang) Source of ephedrine in
Asian medicine
http//www.ktbotanicals.com/images/ephedra.jpg
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Ephedra californica
http//www.gymnosperms.org/users/dws/3_27_05_2/CAL
IFORNIA1a/Ephedra_californica6.JPG
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http//www.sherwincarlquist.com/images_500/gnetale
s-r.jpg
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http//www.sherwincarlquist.com/images_500/gnetale
s-s.jpg
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http//www.conps.org/Slide20Shows/Semi-desert20W
ildflowers20of20Canyons20of20the20Ancients20
National20Monument/images/Ephedra20torreyana.jpg
8
http//www.ubcbotanicalgarden.org/potd/ephedra_fru
stillata1.jpg
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Ephedra trifurca
http//www.utexas.edu/courses/denbow/pollenimages/
ephedra.jpg
http//www.wnmu.edu/academic/nspages2/gilaflora/ep
hedra_trifurca.jpg
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Ephedra foemina
http//pics.livejournal.com/eu_ralf/pic/000ahzkq
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Ephedra gerardiana
http//flora.huh.harvard.edu/FloraData/110/TaxonIm
age/Ephedraceae/Ephedra20gerardiana.jpg
12
http//www.naturephoto-cz.com/photos/bilek/ephedra
-0134.jpg
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Ephedra viridis cone and seeds
http//www.nsl.fs.fed.us/wpsm/Ephedra_viridis.jpg
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Gnetum tree and liana
http//www.icbgpanama.org/website/gall_pictures/Gn
etumfrutos.jpg
http//www.nparks.gov.sg/nursery/uploadfiles/gnetu
mgnemon01.jpg
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http//www.botanypictures.com/plantimages/gnetum2
0parvifolium200120HK20bg.jpg
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Gnetum gnemon tree wood
http//www.sherwincarlquist.com/images_500/gnetale
s-gg.jpg
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Gnetum schwackeanum vine wood
http//www.sherwincarlquist.com/images_500/gnetale
s-hh.jpg
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http//www.sherwincarlquist.com/images_500/gnetale
s-cc.jpg
http//www.obg.uni-bayreuth.de/images/monatspflanz
e/gnetum_maennl.jpg
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http//www.botany.hawaii.edu/FACULTY/CARR/images/g
ne_mon.jpg
http//www.mpg.de/bilderBerichteDokumente/dokument
ation/pressemitteilungen/1999/pri34_99.GIF
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http//www.und.nodak.edu/dept/biology/web_assets/g
raphics/misc/gnetum.GIF
http//www.botanik.uni-karlsruhe.de/garten/fotos-k
noch/Gnetum20gnemon1.jpg
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Welwitschia mirabilis of Southern Africa (Namib
Desert)
http//ecology.botany.ufl.edu/ecologyf02/graphics/
Welwitschia.jpg
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Welwitschia mirabilis showing some idea of size
http//made-in-afrika.com/aloes/welwitschia.jpg
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Welwitschia mirabilis wood
Cross section
Tangential section
http//www.sherwincarlquist.com/images_500/gnetale
s-i.jpg
http//www.sherwincarlquist.com/images_500/gnetale
s-h.jpg
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The plant has two leaves attached to a lignotuber
producing erect branches with strobili of one sex
or the other
http//www.biolib.cz/IMG/GAL/18227.jpg
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Welwitschia mirabilis
http//biology.fullerton.edu/facilities/greenhouse
/Stories_out_of_School/images-welwitschia/cu-stam-
200X-100.jpeg
Male plants produce microsporangiate cones
http//boga.unibe.ch/data/public/Website_ab_2005/B
ilder_gross/Schauhaeuser-und-Vitrinen-Sukkulentenh
aus/welwitschia-mirabilis-190.jpg
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Welwitschia mirabilis
Male plants produce microsporangiate cones. Each
cone scale produces stalked microsporangia
releasing sticky pollen, as well as a nectary
producing a droplet of nectar as a reward to the
pollinator
http//www.sherwincarlquist.com/images_500/gnetale
s-f.jpg
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Welwitschia mirabilis
Pollen grains are captured by the pollination
droplet on a projection of the ovulate cone scale
http//www.studiomomo.com/blog/diaryphotos/1444.jp
g
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Welwitschia mirabilis
After pollination, the pollination tube dries down
http//www.sherwincarlquist.com/images_500/gnetale
s-d.jpg
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Welwitschia mirabilis
Megasporangiate cones
http//spot.colorado.edu/friedmaw/images/welwitsc
hia400x140.gif
seeds
http//www.b-and-t-world-seeds.com/40487.gif
http//www.sherwincarlquist.com/images_500/gnetale
s-e.jpg
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Welwitschia mirabilis megasporophyll with ovule
and pollination tube
http//biology.fullerton.edu/facilities/greenhouse
/Stories_out_of_School/images-welwitschia/Wseed.jp
eg