AGS221 ASSIGNMENT

ANNUAL

Weeds that complete their life cycle from seed to seed in one year or less.  They grow, set seed, and die out completely.  Only new plants are those germinated from seed and appear the following year. Examples of annual weeds are

1.      groundsel

2.      mallow

3.      pigweed

4.      purslane

5.      African lovegrass

6.      African tulip tree

7.      Aleman grass

8.      Alligator weed

9.      Annual ragweed

10.  Arrowhead vine

11.  Athel pine

12.  Balloon vine

13.  Basket asparagus fern

14.  Bathurst burr

15.  Crabgrass

16.  Chickweed

17.  Morning Glory

18.  Quackgrass

19.  Purslane

20.  Shepherd's Purse

BIENNIAL

Weeds that complete their life cycle in 2 years.  During the first year, they produce leaves, stems, and a root system. The cold winter that follows this vegetative growth will help initiate flower development. In the spring and summer of the second year, the weeds will flower, set seed, and die. Examples of biennial weeds are

1.      sherpherd's purse

2.      Yellow rocket

3.      Wild mustard

4.      Birdsrape mustard

5.      Birdsrape mustard

6.      White campion (cockle)

7.      Hairy vetch

8.      Carolina geranium (crane's bill)

9.      Common mallow

10.  Oldfied toadflax

11.  Common mullein

12.  bristly oxtongue

13.  Bull thistle

14.  Annual fleabane

15.  Prickly lettuce

16.  Bristly oxtongue

17.  Musk thistle

18.  Spotted knapweed (Star thistle)

19.  Common burdock

20.  Giant hogweed

PERENNIAL

Weeds that live longer than 2 years and usually have a more extensive root system that the other two life cycles. Examples of perennial weeds are

1.      White heath aster

2.      bindweeds

3.      oxalis

4.      poison oak

5.      African boxthorn

6.      African fountain grass

7.      Dandelion

8.      Barleria prionitis

9.      Giant hogweed

10.  Dusty miller

11.  Perennial sowthistle

12.  Yellow hawkweed

13.  Orange hawkweed

14.  Mouse-ear hawkweed

15.  Common catsear (false dandelion)

16.  Oxeye daisy

17.  Dogfennel

18.  Chicory (coffee-weed)

19.  Common milkweed

20.  Common yarrow

AUTOTROPHIC WEED

An autotroph weed is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals. Because autotrophs produce their own food, they are sometimes called producers. Plants are the most familiar type of autotroph, but there are many different kinds of autotrophic organisms.

1.      Aloe vera

2.      Trillium cuneatum

3.      Alternanthera

4.      Amaranthus

5.      Celosia

6.      Digeri,

7.      Gomphrena

8.      Notorichium

9.      Ptilotus

10.  Alyssum

11.  Brassica

12.  Cakile

13.  Capsella

14.  Sisymbrium

15.  Agrostemma

16.  Arenaria

17.  Cerastium

18.  Calobanthus

19.  Dianthus

20.  Lychni

PARASITIC WEED

Unlike the other type of weeds, parasitic weeds have neither roots nor leaves as the others. However, they attach themselves to the trees, seeds and thorns from which they absorb moisture and nutrients like the worm does, who creeps on leaves of the trees and stems of plants, cuts up and eats to absorb his nutrients.

1.      Dendrophtoe

2.      Tapinantus

3.      Amyema

4.      Viscum

5.      Phoradendron

6.      Arceutobium

7.      Striga

8.      Parentucellia

9.      Melampyrum

10.  Pedicularis

11.  Bellardia

12.  Orobanche

13.  Cistanche

14.  Phelypaea

15.  Cuscuta

16.  Cassytha

17.  Christisoni

18.  Amyema

19.  Dicaeum

20.  Dendrophthoe pentandra