Gymnosperm flashcards

Cycadales

An order of plants characterized by being found in tropical and subtropical regions of the Southern Hemisphere, insect-pollinated, dioecious, with brightly colored seeds and pinnate leaves.

Dioecious

A term describing species that have separate male and female plants.

Cycadaceae

A family within the order Cycadales, exemplified by the genus Cycas, known for central thick mid-vein leaves.

Ginkgoales

An order characterized by fan-shaped leaves with dichotomous venation, dioecious reproductive structures, and fleshy seeds with a strong odor.

Cupressaceae

A family within the order Cupressales, distinguished by scale-like leaves and dioecious or monoecious species, noted for round pollen and shreddy bark.

Pinales

An order characterized by needle-like leaves spirally arranged on stems, monoecious reproduction, and woody cones.

Pinaceae

A family within the order Pinales characterized by trees with needle-like leaves, downward hanging cones, and species such as Pinus and Abies.

Gnetales

An order characterized by dioecious plants with a unique non-coniferous appearance, advanced xylem tissue, and double fertilization like angiosperms.

Genus: Cycas

A genus in the family Cycadaceae known for its dioecious nature and presence of a central thick mid-vein on leaves.

Genus: Ginkgo

The only genus in the family Ginkgoaceae, represented by the species Ginkgo biloba, known for its distinctive fan-shaped leaves.

Genus: Pinus

A genus in the family Pinaceae that includes species such as Pinus palustris and Pinus taeda, characterized by having 3-4 needles per fascicle.

Welwitschiaceae

A family distinguished by the genus Welwitschia, known for its unique two-leaf growth extending throughout its lifespan.

Arils

Fleshy structures covering seeds in the Taxaceae family that can be red or yellow.

Insect-pollinated

Refers to plants that rely on insects for the transfer of pollen and fertilization.

Fleshy seeds

Seeds that have a soft texture, often found in Ginkgoales and some other plant families.

Double fertilization

A unique reproductive process observed in Gnetales and angiosperms, where one sperm fertilizes the egg and another forms the endosperm.

Deciduous conifer

Refers to coniferous plants, like Taxodium, that lose their leaves annually.