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Presentation on theme: "Weeds."— Presentation transcript:

1 Weeds

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

3 Plant Body Leaf = blade + petiole
Functions Exposes surface to sunlight Major site of photosynthesis Conserves water Provides for gas exchange Blade Petiole

4 Phloem transports sugar
Plant Body Stem Functions Holds leaves up to light Transport of substances through vascular tissue Phloem transports sugar Xylem conducts water and minerals

5 Plant Body Root Functions Anchors plant in soil
Takes up water and minerals from soil

6 1 Tree Tobacco Nicotiana glauca
glauca = bluish-gray, referring to leaf color Leaves contain high levels of nicotene Introduced from South America by missionaries, from imported grain or on purpose…?

7 2 Cheeseweed Malva neglecta
Seeds and leaves are edible. Seeds are shaped like rounds of cheese.

8 Castor Bean Ricinus communis
Ricin in seeds used to kill a spy on London Bridge recently discovered in the US mail possible cancer treatment Oil from seeds has laxative and wound-healing properties.

9 4 Sweet fennel Foeniculum vulgare
Petioles are eaten, like celery. Folkways medicine: Dried Leaves may repel fleas Priests spread on mission floors for fragrance Native to the Mediterranean, fennel has spread to surrounding areas, including India. Known to the Greeks and Romans, is was used as food, spice and medicine. The primary use of fennel seeds is to relieve flatulence, but they also settle colic, stimulate the appetite and digestion. Fennel is also diuretic and anti-inflammatory. Like anise (Pimpinella anisum) and caraway (Carum carvi), it has a calming effect on bronchitis and coughs. An infusion of the seeds may be taken as a gargle for sore throats and as a mild expectorant. Fennel increases breast-milk production and the herb is still used as an eye wash for sore eyes and conjunctivitis. Essential oil from the sweet variety is used for its digestive and relaxing properties. MAIN PROPERTIES: Digestive, antispasmodic, anti-inflammatory.

10 5 Scarlet Pimpernel Anagallis arvensis
Folkways Medicine: May repel witches Poisonous to humans and livestock

11 6 Poison hemlock Comium maculatum
Conin causes muscle paralysis, found in all parts of plant.

12 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

13 8 Saltbush Atriplex canescens
Large numbers of nutritious seeds, Used by native Americans for flour 8 Saltbush Atriplex canescens

14 9 Sweet clover Melilotus albus
Enhances production of cumarin by molds Original source of heparin Important source of honey

15 10 Opium poppy Papaver somniferum
Morphine and codeine from developing seed pods 10 Opium poppy Papaver somniferum

16 11 California Poppy Eschscholtzia californica
Young foliage is edible Roots used for toothache

17 12 White Goosefoot Chenopodium
Young foliage and seeds are edible

18 13 Mexican Tea Chenopodium ambrosioides
Folkways Medicine: Seeds act against intestinal worms. Dried plant is used as seasoning.

19 14 Horehound Marubium vulgare
Flavoring in candy, cough drops, and beer Folkways Medicine: good for sore throats Member of the Mint family

20 15 California Mugwort Artemisia douglasiana
Folkways medicine: Uses for intestinal, respiratory and skin ailments.

21 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.

22 17 Sea Fig Charpobrotus chilensis
Edible fleshy fruit forms below the flower Helps to stabilize soil on hillsides or sand near ocean

23 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

24 19 New Zealand Spinach Tetragonia tetragonioides
Leaves can be eaten raw or cooked Contains harmless levels soluble oxalates

25 20 Water Cress Rorippa nasturtium-aquaticum
Leaves and shoots can be eaten. Rich in Vitamin C Be sure it comes from unpolluted waters!

26 21 Wild celery Apium graveolens
Escaped from cultivation Petioles are eaten Wild plant has strong taste made milder by cooking

27 22 Chicory Cichorium intybus
Root scrapings used as coffee flavoring or substitute Leaves of C. endiva used in salads

28 23 Western Ragweed Ambrosia
The pollen is a common respiratory or hay-fever allergen.

29 24 Sow Thistle Sonchus Young leaves are edible
One species is a noxious weed

30 25 Plantain Platago potagonica
Young leaves are edible Folkways medicine: wound healing, laxative

31 26 Curly Dock Rumex crispus
Young leaves are edible Folkways medicine: to treat cough, blood pressure, itching, sprains Toxic to livestock

32 27 Dandelion Taraxacum officinale
Young leaves and roots are eaten Dried roots used as coffee substitute Seeds dispersed by wind

33 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

34 29 Wild Radish Raphanus sativus
Scrapings from young roots or young seed pods taste like radishes

35 30 Wild oats Avena fatua Escaped from cultivation Seeds are edible

36 31 English Ivy Hedera helix
Juice causes skin irritation Berries and leaves are toxic

37 32 Periwinkle Vinca major
A related species provides treatments for Hodgkin’s disease, leukemia and other cancers 32 Periwinkle Vinca major

38 33 Garden Nastursium Tropaeolum majus
Leaves are eaten in salads Hallucinogenic properties unproven

39 34 Blue Gum Eucalyptus Eucalyptus globosus
Added as a flavoring to candies and cough medicines

40 35 Spurge Euphorbia Milky sap (latex) causes skin irritation
Relative of the mildly-toxic Poinsettia plant

41 36 Narrow-Leaf Milkweed Asclepias
Cardiac glycoside acts as Medicinal heart stimulant Arrow poison Insect defense mechanism

42 37 White and Purple Nightshade Solanum
Berries are poisonous Relatives of the potato

43 Worksheet Complete page 169 from lab manual
Be sure your instructor checks your completed worksheet before you leave the lab

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