Divisions of Seed Plants. Div: Gnetophyta The “Gnetophytes” n 1. Are gymnosperms. n 2. Have vessels as well as tracheids. n 3. Interval between pollination.

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Presentation transcript:

Divisions of Seed Plants

Div: Gnetophyta The “Gnetophytes” n 1. Are gymnosperms. n 2. Have vessels as well as tracheids. n 3. Interval between pollination and fertilization is short. n 4. Mostly dioecious. n 5. Embryogengy has a more limited free nuclear period. n 6. Pollen chamber extends to female gametophyte - short pollen tube rapid fertilization.

Div: Gnetophyta Order: Gnetales Geneus: Ephedra n 1. Resembles whisk ferns. n 2. Most of the photosynthesis occurs in new branches. n 3. Leaves appressed against stem. n 24-3

Div: Gnetophyta Order: Gnetales Geneus: Ephedra n 1. Resembles whisk ferns. n 2. Most of the photosynthesis occurs in new branches. n 3. Leaves appressed against stem. n 24-3

Div: Gnetophyta Order: Ephedrales Genus: Ephedra

Div: Gnetophyta Order: Gnetales Geneus: Ephedra n 1. Resembles whisk ferns. n 2. Most of the photosynthesis occurs in new branches. n 3. Leaves appressed against stem. n 4. Compound megastrobili and simple microstrobili. n 24-6 C, D, E

Div: Gnetophyta Order: Gnetales Geneus: Ephedra n 1. Resembles whisk ferns. n 2. Most of the photosynthesis occurs in new branches. n 3. Leaves appressed against stem. n 4. Compound megastrobili and simple microstrobili. n 24-6 C, D, E

Div: Gnetophyta Order: Gnetales Geneus: Ephedra n 1. Resembles whisk ferns. n 2. Most of the photosynthesis occurs in new branches. n 3. Leaves appressed against stem. n 4. Compound megastrobili and simple microstrobili. n 24-6 C, D, E

Div: Gnetophyta Order: Gnetales Geneus: Ephedra n Young ovule:

Div: Gnetophyta Order: Gnetales Geneus: Ephedra n Mature ovule: n 24-12

Div: Gnetophyta Order: Welwitschiales Genus:Welwitschia n 1. Long underground stems. n 2. Straplike leaves - basal meristem. n (intercalary growth)