horticulture crop weeds
DESCRIPTION
Horticulture Crop Weeds. CS 414 Weed Science Laboratory. Hairy galinsoga Galinsoga ciliata Asteraceae Summer annual, upright, branching Pubescent stems & leaves (upper surface of blades) Opposite leaves with toothed margins White flowers – both disk and ray flowers (toothed) present. - PowerPoint PPT PresentationTRANSCRIPT
Horticulture Crop Weeds
CS 414 Weed Science Laboratory
Hairy galinsoga
Galinsoga ciliata
Asteraceae
Summer annual, upright, branching
Pubescent stems & leaves (upper surface of blades)
Opposite leaves with toothed margins
White flowers – both disk and ray flowers (toothed) present
Common purslane
Portulaca oleracea
Asteraceae
Summer annual, prostrate
Rounded leaf apex
Fleshy leaf blade
Yellow flowers in leaf axils open in sun
Similar in appearance to P. pilosa – note flower color, apex, and leaf shape
Common Name: pink purslaneFamily: Asteraceae Genus: Portulaca Species: pilosa Summer annual
•leaves are thick and fleshy, arranged alternately on the stem, and have a prostrate growth habit – pointed apex
Annual sedge
Cyperus compressus
Cyperaceae
Summer annual
Many stems develop in a dense clump
Leaf blades narrow compared to PNS or YNS
Flower spikelets flattened
NO tubers or rhizomes
Cyperus esculentus
Cyperaceae
Yellow nutsedge
Perennial
Tubers are smooth and singular, yellow seed head, lance-shaped leaf
Cyperus rotundus
Purple nutsedge
Cyperaceae
Perennial
Leaf abruptly tapers to a point, broader than YNS
Tubers string together along rhizome
Virginia copperleaf
Acalypha virginica
Euphorbiaceae
Erect, branching summer annual
Rounded cotyledons have notched apex, glabrous
First true leaves opposite, later leaves alternate, lanceolate
Flowers green, in clusters yield a 3-lobed seed pod
Common Name: carpetweedFamily: Molluginaceae Genus: MollugoSpecies: verticillatasummer annual
•Carpetweed has whorls of leaves at each stem node in addition to the circular, light green, mat-like growth
Common Name: large crabgrassFamily: PoaceaeGenus: DigitariaSpecies: sanguinalisSummer annual
•densely hairy leaf and sheath•roots at the stem nodes, smooth crabgrass does not•large, jagged membranous ligule
Common Name: goosegrassFamily: PoaceaeGenus: EleusineSpecies: indicaSummer annual
•Flattened stems with a white center•ligule fringed, uneven, and membranous•Leaves folded in the bud
Datura stramonium
Jimsonweed
Solanaceae
Summer annual
Distinct midvein in cotyledons
Bur-like fruit contains many seeds
Large white flowers
Leaves with lobed margins
Stems become “woody” with age
All parts extremely poisonous
Eastern black nightshade
Solanum ptycanthum
Solanaceae
Erect summer annual
Taproot with lateral branches
Hypocotyls covered w/small hairs
Cotyledons green on upper portion of blade, purple to maroon on lower surface
Star shaped flowers yield small, green, many-seeded berries
Extremely poisonous, ripe berries may be less (not) poisonous