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Weeds - PowerPoint PPT Presentation

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Weeds. Plant Body. Shoot system = leaves + stem Root system Meristem = cells that divide for life of plant, can give rise to all plant structures. Blade. Petiole. Plant Body. Leaf = blade + petiole.

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plant body
Plant Body
  • Shoot system = leaves + stem
  • Root system
  • Meristem = cells that divide for life of plant, can give rise to all plant structures
plant body3



Plant Body

Leaf = blade + petiole

FunctionsExposes surface to sunlight Major site of photosynthesis Conserves water Provides for gas exchange

plant body4

Xylem conducts water

and minerals

Phloem transports sugar

Plant Body



Holds leaves up to light

Transport of substances through vascular tissue

plant body5
Plant Body



Anchors plant in soil

Takes up water and minerals from soil

1 tree tobacco nicotiana glauca
1 Tree Tobacco Nicotiana glauca

glauca = bluish-gray,referring to leaf colorLeaves contain high levels of nicoteneIntroduced from South America by missionaries, from imported grain or on purpose…?

2 cheeseweed malva neglecta
2 Cheeseweed Malva neglecta

Seeds and leaves are edible.

Seeds are shaped like rounds of cheese.

castor bean ricinus communis

Ricin in seeds --used to kill a spy on London Bridge --recently discovered in the US mail --possible cancer treatmentOil from seeds has laxative and wound-healing properties.

Castor BeanRicinus communis
4 sweet fennel foeniculum vulgare
4 Sweet fennel Foeniculum vulgare
  • Petioles are eaten, like celery.
  • Folkways medicine: Dried Leaves may repel fleas
  • Priests spread on mission floors for fragrance
5 scarlet pimpernel anagallis arvensis
5 Scarlet Pimpernel Anagallis arvensis

Folkways Medicine: May repel witches

Poisonous to humans and livestock

6 poison hemlock comium maculatum
6 Poison hemlock Comium maculatum

Conin causes muscle paralysis, found in all parts of plant.

7 filaree storksbill erodium
7 Filaree (Storksbill)Erodium
  • Fruit shape is long and pointed
    • Filaree comes from the Spanish name for needle
    • Erodium refers to heron
  • Young foliage is edible
9 sweet clover melilotus albus
9 Sweet clover Melilotus albus

Enhances production of cumarin by moldsOriginal source of heparinImportant source of honey

10 opium poppy papaver somniferum
10 Opium poppy Papaver somniferum

Morphine and codeine from developing seed pods

11 california poppy eschscholtzia californica
11 California PoppyEschscholtzia californica

Young foliage is edibleRoots used for toothache

12 white goosefoot chenopodium
12White GoosefootChenopodium

Young foliage and seeds are edible

13 mexican tea chenopodium ambrosioides
13 Mexican Tea Chenopodium ambrosioides

Folkways Medicine: Seeds act against intestinal worms.

Dried plant is used as seasoning.

14 horehound marubium vulgare
14 Horehound Marubium vulgare

Flavoring in candy, cough drops, and beerFolkways Medicine: good for sore throats

Member of the Mint family

15 california mugwort artemisia douglasiana
15 California Mugwort Artemisia douglasiana

Folkways medicine: Uses for intestinal, respiratory and skin ailments.

16 jimson weed datura meteloides
16 Jimson weed Datura meteloides

All parts of plant have alkaloids like atropine. --medical use --religious observances by Native Americans --hallucinogen in the 60’s

DANGEROUS! Recent hospitalizations and deaths reported in LA County.

17 sea fig charpobrotus chilensis
17 Sea FigCharpobrotus chilensis
  • Edible fleshy fruit forms below the flower
  • Helps to stabilize soil on hillsides or sand near ocean
18 tumbleweed russian thistle salsola tragus
18 Tumbleweed(Russian Thistle)Salsola tragus
  • Noxious weed = targeted for eradication
  • Shoot breaks off close to base and is pushed by wind to distribute seeds.
  • Contains high levels of nitrates or soluble oxalates
19 new zealand spinach tetragonia tetragonioides
19 New Zealand SpinachTetragonia tetragonioides
  • Leaves can be eaten raw or cooked
  • Contains harmless levels soluble oxalates
20 water cress rorippa nasturtium aquaticum
20 Water Cress Rorippa nasturtium-aquaticum
  • Leaves and shoots can be eaten.
  • Rich in Vitamin C
  • Be sure it comes from unpolluted waters!
21 wild celery apium graveolens
21 Wild celery Apium graveolens
  • Escaped from cultivation
  • Petioles are eaten
  • Wild plant has strong taste made milder by cooking
22 chicory cichorium intybus
22 ChicoryCichorium intybus
  • Root scrapings used as coffee flavoring or substitute
  • Leaves of C. endiva used in salads
23 western ragweed ambrosia
23 Western Ragweed Ambrosia

The pollen is a common respiratory or hay-fever allergen.

24 sow thistle sonchus
24 Sow Thistle Sonchus
  • Young leaves are edible
  • One species is a noxious weed
25 plantain platago potagonica
25 PlantainPlatago potagonica
  • Young leaves are edible
  • Folkways medicine:wound healing, laxative
26 curly dock rumex crispus
26 Curly Dock Rumex crispus
  • Young leaves are edible
  • Folkways medicine: to treat cough, blood pressure, itching, sprains
  • Toxic to livestock
27 dandelion taraxacum officinale
27 DandelionTaraxacum officinale
  • Young leaves and roots are eaten
  • Dried roots used as coffee substitute
  • Seeds dispersed by wind
28 black mustard brassica nigra
28 Black Mustard Brassica nigra
  • Young leaves are eaten
  • Seed oil used to make mustard
  • Possibly introduced by missionaries who scattered it along the Camino Real to mark the way between missions
29 wild radish raphanus sativus
29 Wild RadishRaphanus sativus

Scrapings from young roots or young seed pods taste like radishes

30 wild oats avena fatua
30 Wild oats Avena fatua
  • Escaped from cultivation
  • Seeds are edible
31 english ivy hedera helix
31 English IvyHedera helix
  • Juice causes skin irritation
  • Berries and leaves are toxic
32 periwinkle vinca major
32 Periwinkle Vinca major

A related species provides treatments for Hodgkin’s disease, leukemia and other cancers

33 garden nastursium tropaeolum majus
33 Garden NastursiumTropaeolum majus
  • Leaves are eaten in salads
  • Hallucinogenic properties unproven
34 blue gum eucalyptus eucalyptus globosus
34 Blue GumEucalyptusEucalyptus globosus

Added as a flavoring to candies and cough medicines

35 spurge euphorbia
35 SpurgeEuphorbia
  • Milky sap (latex) causes skin irritation
  • Relative of the mildly-toxic Poinsettia plant
36 narrow leaf milkweed asclepias
36 Narrow-Leaf MilkweedAsclepias
  • Cardiac glycoside acts as
    • Medicinal heart stimulant
    • Arrow poison
    • Insect defense mechanism
37 white and purple nightshade solanum
37 White and Purple NightshadeSolanum
  • Berries are poisonous
  • Relatives of the potato
  • Complete page 169 from lab manual
  • Be sure your instructor checks your completed worksheet before you leave the lab