gymnosperms non flowering seed plants l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
“gymnosperms”: non-flowering seed plants PowerPoint Presentation
Download Presentation
“gymnosperms”: non-flowering seed plants

Loading in 2 Seconds...

play fullscreen
1 / 12

“gymnosperms”: non-flowering seed plants - PowerPoint PPT Presentation


  • 415 Views
  • Uploaded on

“gymnosperms”: non-flowering seed plants Alpha Families Beta Families Cycadales (Order) Welwitschiaceae Ginkgoaceae Podocarpaceae Pinaceae Araucariaceae Cupressaceae (including Taxodiaceae) Taxaceae Ephedraceae Gnetaceae “gymnosperms”

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about '“gymnosperms”: non-flowering seed plants' - Jeffrey


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
gymnosperms non flowering seed plants
“gymnosperms”: non-flowering seed plants
  • Alpha FamiliesBeta Families
  • Cycadales (Order) Welwitschiaceae
  • Ginkgoaceae Podocarpaceae
  • Pinaceae Araucariaceae
  • Cupressaceae
  • (including Taxodiaceae)
  • Taxaceae
  • Ephedraceae
  • Gnetaceae
cycadales cycadaceae zamiaceae stangeriaceae the cycad families 11 185 tropical and subtropical

“gymnosperms”

Cycadales -- (Cycadaceae, Zamiaceae, Stangeriaceae) the cycad families (11/185; tropical and subtropical)
  • Plants seed plants, dioecious
  • Habit shrubs or trees with leaves arranged in terminal rosettes
  • Leaves tightly alternate forming a dense terminal rosette; pinnately compound; some with circinate vernation
  • Pollen borne on strobili with many spirally arranged scales; 6-manypollen sacs per scale (microsporophylls), on underside (abaxial)
  • Ovules borne on strobili with many spirally arranged peltate scales or megasporophylls; Cycadaceae: 2-8 ovules on margin of megasporophyll Zamiaceae: 2 ovules underneath peltate-shaped megasporophyll
  • Seedslarge, fleshy coat
ginkgoaceae the maidenhair tree family 1 1 found in se asia

“gymnosperms”

Ginkgoaceae --the maidenhair tree family(1/1; found in Se Asia)
  • Plants seed plants, dioecious
  • Habit trees
  • Leaves alternate;simple, fan-shaped with dichotomous venation; borne on long and short shoots; petiolate
  • Pollen borne on spike-like clusters of sporangiophores; arising from axil of bud scale or leaf on short shoot; 2 reflexed pollen sacs/sporangiophore
  • Ovules borne on forking “peduncle” arising from axil of leaf on short shoot; 2 (3+) erect ovules each with subtending collar
  • Seeds large, fleshy coat
pinaceae the pine family 9 12 210 cosmopolitan

“gymnosperms”

Pinaceae -- the pine family(9-12/210; cosmopolitan)
  • Plants seed plants, monoecious
  • Habit shrubs or trees
  • Leaves alternate or closely fascicled on determinate or indeterminate short shoots; simple and linear to needle-like
  • Pollen borne on strobili with many spirally arranged scales; 2 pollen sacs per scale, on underside of scale (abaxial)
  • Ovules borne on cones (scale/bract complex) woody at maturity with many spirally arranged scales, flattened and ± free from subtending bracts; 2 ovules per cone scale, on top of scale (adaxial)
  • Seeds usually winged (rarely wingless)
cupressaceae the cypress family includes taxodiaceae 28 156 cosmopolitan

“gymnosperms”

Cupressaceae --the cypress family(includes Taxodiaceae) (28/156; cosmopolitan)
  • Plants seed plants, monoecious or dioecious
  • Habit shrubs or trees
  • Leaves alternate, opposite, or whorled;simple and scale-like, awl-shaped or linear
  • Pollen borne on strobili with many scales; 2-9 pollen sacs per scale, on underside of scale (abaxial)
  • Ovules borne on cones (scale/bract complex) usually woody at maturity (fleshy in Juniperus) with several to many scales, flattened or often peltate; wholly adnate to subtending bract; 2-many ovules per cone scale, on top of scale (adaxial)
  • Seeds small, wingless or narrowly winged
taxaceae the yew family 5 17 20 widely distributed mostly northern hemisphere

“gymnosperms”

Taxaceae --the yew family(5/17-20; widely distributed, mostly northern hemisphere)
  • Plants seed plants, dioecious (rarely monoecious)
  • Habit shrubs or trees
  • Leaves alternate;simple and linear or needle-like, decurrent on twigs
  • Pollen borne on strobili (look like cones) with several flattened sterile basal scales and 4-32 spirally arranged or whorled, peltate or ± flattened structures called sporangiophores that each bear 2-9 pollen sacs
  • Ovules solitary or in pairs, borne on reduced cones (one scale) terminal on short shoots
  • Seeds solitary, surrounded by a tubular green or red fleshy aril
taxaceae comments

“gymnosperms”

Taxaceae --comments
  • Comments: interesting coniferous family: you commonly see Taxus cultivated around Cornell campus. Which is more commonly planted, female plants or male plants? Taxus brevifolia (from the Pacific Northwest) is the source of Taxol, a treatment for breast cancer.
  • The aril is bright red in Taxus and green in Torreya, which is named after the famous American botanist John Torrey (1796-1873).
slide8

“gymnosperms”

Ephedraceae --the mormon-tea family(1/40; desert and semidesert regions of Northern Hemisphere and South America)
  • Plants seed plants, dioecious
  • Habit shrubs, woody vines (rarely trees) with jointed green, photosynthetic stems
  • Leaves opposite or whorled, simple, scale-like, often deciduous
  • Pollen borne on spike-like strobili with 1-8 polleniferous structures on a “filament” (each with 1-several pollen sacs) each subtended by a pair of bracts
  • Ovules borne on strobili with 1-3 ovulate structures each subtended by 2-4 pairs or whorls of scale-like bracts
  • Seeds dry or seeds and subtending structures fleshy

Comments: long-used in Chinese medicine, also as a tea by western settlers. Synthetic analog (pseudoephedrine) of active compound in many cold remedies.

gnetaceae the gnetum family 1 30 pantropical

“gymnosperms”

Gnetaceae --the gnetum family(1/30; Pantropical)
  • Plants seed plants, dioecious (monoecious)
  • Habit shrubs, woody vines or trees
  • Leaves opposite, simple, entire, pinnately veined, petiolate
  • Pollen borne on aggregations of polleniferous structures with 1 or 2 pollen sacs (on “filaments?”) each structure surrounded by a tubular bract
  • Ovules borne whorled on spike-like clusters with a solitary ovule surrounded by a tubular bract
  • Seeds large, with tubular bracts forming a fleshy outer layer

Comments: leaves, seeds, and tubers of several species eaten in Southeast Asia and Africa

welwitschiaceae the welwitschia family 1 1 coastal desert of southwest africa

b family “gymnosperms”

Welwitschiaceae --the welwitschia family(1/1; coastal desert of southwest Africa)
  • Plants seed plants, dioecious
  • Habit woody/fleshy obconical stem with long tap root
  • Leaves 2 opposite, strap-shaped, persisting throughout the life of the plant and growing from the base
  • Pollen stalked polleniferous structures with 3 pollen sacs born in strobili with a non- functional ovule in the center; strobili borne on branched axes
  • Ovules also in strobili on branched axes, ovule borne in bract axile enclosed by two pairs of bracts, the inner pair fused around the ovule
  • Seeds with conspicuous wings formed by inner pair of bracts

Comments: a truly bizarre plant, very slow growing and long-lived (more than 1000 years); vessels present

slide11

b family “gymnosperms”

Araucariaceae --the araucaria family(3/40; Asian tropics and south temperate South American and Australian region)
  • Plants seed plants, dioecious (rarely monoecious)
  • Habit trees
  • Leaves alternate or opposite, simple and needle-like, awl-shaped or ovate
  • Pollen borne on strobili with many scales; many pollen sacs per scale, on underside of scale (abaxial)
  • Ovules borne on cones (scale/bract complex) woody with many spirally arranged, flattened scales, wholly or partially adnate to subtending bract; ovules usually 1 (rarely 2) per cone scale, on top of scale (adaxial) or embedded in scale; cones disarticulating at maturity
  • Seeds winged and breaking free from cone or wingless and disspersed as a unit with scale/bract complex
podocarpaceae the podocarp family 13 17 172 south temperate and tropical

b family “gymnosperms”

Podocarpaceae --the podocarp family(13-17/172; south temperate and tropical)
  • Plants seed plants, dioecious or monoecious
  • Habit trees or shrubs, rarely root parasites, branches sometimes flattened and leaf-like (cladodes)
  • Leaves alternate ( rarely opposite), simple and needle-like, scale like or with flattened blades
  • Pollen borne on strobili with many spirally-arranged scales; 2 pollen sacs per scale, on underside of scale (abaxial)
  • Ovules borne on spikelike or reduced cones with 1-2 terminal ovules, each adnate to a cone scale and bract and to a swollen fleshy cone axis
  • Seeds dry or fleshy sometimes with fleshy aril