1 / 10

Ch 22 Part 2

Ch 22 Part 2. Phylum Pinophyta – The Conifers. Other Conifers: Yew ( Taxus ) and California nutmeg ( Torreya ) produce ovules singly at tips of shoots. Each ovule at least partially surrounded by fleshy, cuplike aril . Southern hemisphere conifer - Podocarpus

bridie
Télécharger la présentation

Ch 22 Part 2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ch 22 Part 2

  2. Phylum Pinophyta – The Conifers • Other Conifers: • Yew (Taxus) and California nutmeg (Torreya) produce ovules singly at tips of shoots. • Each ovule at least partially surrounded by fleshy, cuplike aril. • Southern hemisphere conifer - Podocarpus • Fleshy-coated seeds with large appendage at base • Junipers - Seed cones fleshy. Taxus Podocarpus

  3. Other Gymnosperms • Phylum Ginkgophyta – Ginkgo (maidenhair trees) • Only one living species • Only exists in cultivation • Notched, broad, fan-shaped leaves • Leaves on short, slow-growing spurs. • No midrib or prominent veins • Hair-like veins branch dichotomously. • Deciduous

  4. Other Gymnosperms • Phylum Ginkgophyta • Life cycle similar to pines. • Dioecious - Male and female structures on separate trees. • Seeds enclosed in fleshy seed coat with nauseating odor. Seeds and leaves Male strobili

  5. Other Gymnosperms • Phylum Cycadophyta – The Cycads • Slow-growing plants of tropics and subtropics • Tall unbranched trunks • Crown of large pinnately divided leaves • Life cycle similar to conifers. • Pollination sometimes by beetles. • Dioecious • Has pollen and seed strobili Male cycad Female cycad

  6. Other Gymnosperms Part of plant • Phylum Gnetophyta – The Gnetophytes • Unique among the gymnosperms in having vessels in the xylem. • Joint firs (Ephedra) - Shrubby plants of drier regions of southwestern North America Male strobili Female strobilus Ephedra

  7. Other Gymnosperms • Phylum Gnetophyta – The Gnetophytes • Gnetum - Vine-like plants with broad leaves • In tropics

  8. Other Gymnosperms • Phylum Gnetophyta – The Gnetophytes • Welwitschia - Only one species, confined to deserts of southwestern Africa • Short stem • Long taproot • Only two straplike leaves that become tattered and split • Dioecious • Has male and female strobili

  9. Human Relevance of Gymnosperms • Conifers • Edible inner bark and needles of white pine, and seeds of nearly all pines • Masts in sailing vessels • Crates, boxes, matchsticks, furniture • Telephone poles, railroad ties, mine timbers • Turpentine and rosin (both from resin) • Fuel • Pulpwood • Construction lumber • Ornamentals • Pharmaceuticals (taxol for ovarian cancer from yew trees)

  10. Human Relevance of Gymnosperms • Other Gymnosperms • Ginkgo: • Seeds for food (after seed coat removal) • Ginkgo extracts to increase blood circulation • Ephedra - Mormon tea • Drug ephedrine for respiratory problems from a Chinese species

More Related