10.3. Toxicodendron diversilobum: Pacific Poison Oak http://www.ck12.org
have only half the chromosomes of the parent cell.
Evolution
The first plant ever was ancestral green algae. The first plants that were found on solid ground were bryophytes
such as hornworts, liverworts, and mosses. They were low-growing plants since they didn’t have any vascular
tissue. Vascular tissue are tubes inside the plant that carry nutrients and water to the leaves so that they can use
photosynthesis. They also carry the sugar made by the photosynthesis to other parts of the plant for storage. Ferns
and some similar plants have vascular tissue which helps them grow tall. These plants reproduce with spores, and
the spores need moisture.
After the ferns came the gymnosperms. Some gymnosperms include pines and firs. Their seeds are enclosed in
cones but not completely enclosed. The last of the phases in evolution is the flowering plants. They produce seeds
after having their flowers pollinated. Their seeds are inside the part of the flower that becomes the fruit. Flowering
plants are the most abundant.T. diversilobumis a flowering plant.
Ecology
There are many animals that can eatT. diversilobum, such as deer, rats, sheep, and goats. Birds would eat then
disperseT. diversilobumseeds.
Anatomy and Physiology
T. diversilobumis a dicot, which means that it has both female and male reproductive systems on the same plant.
AsT. diversilobumis a vine, it has a long stem that have other stems coming out of the main vine. The leaves then
come out of those smaller stems. It’s leaves are made of three leaflets with small teeth on each of the leaflets. Its sap
contains urushiol, which can cause an allergic reaction.T. diversilobumhas tiny, white flowers.
References
- "Toxicodendron Diversilobum —Overview." Encyclopedia of Life. http://eol.org/pages/582277/maps
- "Animal and Plant Cells" CK-12 Foundation.http://www.ck12.org/biology/Organelles/lesson/user:am1vcnJvd
0BjbGFzc2ljYWxhY2FkZW15LmNvbQ../Animal-and-Plant-Cells/ - "Biogeog Template." Biogeog Template. http://online.sfsu.edu/bholzman/courses/Fall01%20projects/poison
oakfinalwebsite.htm - "Common Parts of the Cell." CK-12 Foundation. http://www.ck12.org/biology/Common-Parts-of-the-Cell/les
son/Common-Parts-of-the-Cell/ - "Early Evolution of Plants" CK-12 Foundation. http://www.ck12.org/biology/Early-Evolution-of-Plants/le
sson/Early-Evolution-of-Plants/ - "Evolution of Seed Plants" CK-12 Foundation. http://www.ck12.org/biology/Evolution-of-Seed-Plants/les
son/Evolution-of-Seed-Plants/ - "PLANTS Profile for Toxicodendron Diversilobum (Pacific Poison Oak)” USDA PLANTS. http://plants.us
da.gov/java/profile?symbol=todi - "Prokaryotic and Eukaryotic Cells" CK-12 Foundation. http://www.ck12.org/biology/Prokaryotic-and-Euka
ryotic-Cells/lesson/Prokaryotic-and-Eukaryotic-Cells/ - "Toxicodendron Diversilobum." Calflora. http://www.calflora.org/cgi-bin/species_query.cgi?where-taxon=To
xicodendron+diversilobum