annual plant

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annual plant

any plant that germinates from seed, grows to maturity and produces new seed all within one year or growing season. Since the life-cycle duration is so short, annuals are usually herbaceous rather than woody. Examples include groundsel, shepherd's purse. See BIENNIAL, PERENNIAL.


a member of the vegetable kingdom; living things characterized by absence of locomotion, absence of special senses, and feeding only on inorganic substances.

abortigenic plant
plants that cause abortion include Pinus, Cupressus and Astragalus spp.
plant alkaloids
annual plant
one that completes its life cycle within one year. A winter annual plant germinates in the fall, overwinters as a seedling and flowers and seeds in spring. The dominant grazing species in the early spring. Examples would be many mustard weeds of disturbed places incriminated in the congenital hypothyroid dysmaturity syndrome in foals.
plant awns
sharp, long processes attached to seed casings of plants, mostly grasses; important causes of skin and oral lesions in grazing animals, and to housed animals when fed hay containing the plants.
biennial plant
one that completes its life cycle in two years, generally germinating and growing in the first year and flowering, fruiting and subsequently dying in the second year.
plant eating
both dogs and cats may eat grass; indoor animals sometimes eat ornamental plants, some of which are poisonous.
plant edemagens
plant substances that cause edema in animals, e.g. 3-methyl indole, produced in the rumen from tryptophan.
plant hormones
organic substances produced by plants which are extracted and used as herbicides or plant growth stimulants. Some of them cause long-term ill health in animals if drunk in large quantities.
perennial plant
one that completes its life cycle over more than two years.
plant poisoning
the list of poison plants is very large and it is necessary to know the suspect plant's botanical name to begin an effective search for information about it. In order to exert an effect on an animal the plant has, in most cases, to be eaten. There are a few plants that exert a toxic effect by inhalation or by skin contact.
plant protein
the proteins in plants. Common, protein-rich plants include alfalfa, the oilseed meals, e.g. soyabean, cottonseed and linseed meals, clover, the legume seeds, e.g. peas, beans.
teratogenic plant
plants that cause congenital defects include Lupinus, Lathyrus, Leucaena, Nicotiana, Conium, Astragalus, Oxytropis, Veratrum, Vicia, Salsola spp.
plant toxins
phytotoxins, elaborated by plants, in some cases incorporating an inorganic element, e.g. selenocompounds, and in some cases present in the plant in an inert state, requiring an additional ingredient, e.g. ruminal fermentation to activate it.
References in periodicals archive ?
After which no more weeds are needed but it is time for the winter annual weeds like common chickweeds, annual bluegrass, henbit and deadnettle, and speedwell to start into growth.
Aside from the tarweeds, there are few other late-season winter annual species with a similar life cycle in the native California flora.
In some southern states diquat is used for winter annual weed control in dormant bermudagrass.
Summer annuals are more numerous than winter annuals.
They're sustained by the seed crop of those winter annuals.
Under field conditions, sowing date will strongly influence the developmental stage reached by the winter annuals in autumn.
Robert Davie of Robert Davie and Associates says January is an especially rewarding time to plant winter annuals if you never got around to it in the fall.
On average, winter annuals have larger seeds than do summer annuals (Brown et al.
Winter annuals germinate from September through December and remain as small vegetative tufts or rosettes until March or April when they rapidly grow, reproduce and die by May (Mulroy and Rundel, 1977).
Although rye was used in this study, it is likely that other less cold tolerant winter annuals would be nearly as effective in settings where early planting dates are possible and post-harvest soil nitrate levels are moderate to low.
Creating your own strain by selection is not that difficult but many people treat polyanthus as winter annuals, discarding them after flowering.
When topsoil containing seeds was collected from the Colorado Desert, spread on washed sand in flats, and kept in day and night temperatures of 18 [degrees] C and 8-13 [degrees] C, respectively, winter annuals germinated.