common ragweed
A plant, Ambrosia artemisiifolia, which is the most widespread plant of the genus Ambrosia in North America.

common ragwort
A plant of species Jacobaea vulgaris (syn. Senecio jacobaea), native to Eurasia, widely introduced elsewhere, considered noxious even in some of its native habitat.

common sow thistle
Milk thistle (Sonchus oleraceus), native to western Eurasia.

common spikeweed
Synonym of spikeweed.

common yarrow
Achillea millefolium, a flowering plant widespread in the temperate Northern Hemisphere, formerly and sometimes used to stanch the flow of blood.

compass plant
Any of several plants, the leaves of which become oriented to the morning sun:
Any of several plants, the leaves of which become oriented to the morning sun:
Any of several plants, the leaves of which become oriented to the morning sun:

compassplant
Alternative form of compass plant.

compassplants
plural of compassplant

composites
plural of composite

cone-flower
Alternative spelling of coneflower.

coneflower
Any of several similar flowering plants of tribe Heliantheae in order Asterales, in genera Dracopis, Echinacea, Rudbeckia, and Ratibida, that have a cone-shaped disk of florets.
Any of certain species of genus Isopogon, in order Proteales, principally of temperate Australia

coneflowers
plural of coneflower

consumption weed
Synonym of groundselbush.

coreopses
plural of coreopsis

coreopsis
Any of several composite herbs, of genus Coreopsis, typically with bright yellow flowers.

coreopsises
plural of coreopsis

corn marigold
Glebionis segetum (syn. Chrysanthemum segetum), a herbaceous perennial plant with bright yellow flowers.

cornflower
A small annual plant in the family Asteraceae, Centaurea cyanus, usually with bushy blue flowers which grows natively in European cornfields (i.e. wheatfields).
A plant of the species Cichorium intybus.
A color, cornflower blue.

cornflowers
plural of cornflower

cos lettuce
Synonym of romaine lettuce, a long-leaved variety of lettuce.

cosmoi
plural of cosmos

cosmos
The universe regarded as a system with harmony and order.
The universe regarded as a system with harmony and order.
Harmony, order.

cosmoses
plural of cosmos

costmaries
plural of costmary

costmary
An aromatic plant (Tanacetum balsamita), once used to flavour ale (prior to use of hops); also used as a bookmark in Bibles and other holy texts to dissuade silverfish and other pests.

cota
A perennial herb, Thelesperma megapotamicum (synonym Thelesperma gracile), native to the southwest and western plains of North America and used by the Hopi, Navajo and other American Indians for tea, as a dye, and for other herbal purposes.

cotton thistle
Any of various flowering plants in the genus Onopordum of the family Asteraceae, especially Onopordum acanthium.

cotton thistles
plural of cotton thistle

cottonrose
Any of the genera Filago and Logfia of flowering plants of Eurasia and North America.

cottonroses
plural of cottonrose

cottonthistle
Alternative form of cotton thistle.

cottonthistles
plural of cottonthistle

coughbush
A flowering plant of species Ernodea littoralis.
A flowering plant of species Cassinia laevis.

coughwort
coltsfoot

creeping thistle
Corn thistle.

cretanweed
The annual herb Hedypnois rhagadioloides.

crown daisy
Glebionis coronaria, endemic to the Mediterranean region, introduced in east Asia and north America.

crownbeard
Any of the flowering plants of the genus Verbesina.

crownbeards
plural of crownbeard

cucklebur
Alternative form of cocklebur.

cuckleburr
Alternative form of cocklebur.

cuckleburrs
plural of cuckleburr

cuckleburs
plural of cucklebur

cudweed
Any member of species of flowering plants in family Asteraceae of several genera:
Any member of species of flowering plants in family Asteraceae of several genera:
Any member of species of flowering plants in family Asteraceae of several genera:
Any member of species of flowering plants in family Asteraceae of several genera:
Any member of species of flowering plants in family Asteraceae of several genera:
Any member of species of flowering plants in family Asteraceae of several genera:
Antennaria dioica
Cudbear, a fungus of species (Ochrolechia tartarea, syn. Lecanora tartarea)

cudweeds
plural of cudweed

cup plant
The plant Silphium perfoliatum.

curio
A strange and interesting object; something that evokes curiosity.

curios
plural of curio

curly plumeless thistle
Any of the species Carduus crispus of biennial herbs.

curlycup gumweed
Grindelia squarrosa, a small North American biennial or short-lived perennial plant with yellow flowers.

daisies
plural of daisy

daisy
A wild flowering plant of species Bellis perennis of the family Asteraceae, with a yellow head and white petals
Any of numerous other flowering plants of various species, mostly among the asterids.
A boot or other footwear.
Something splendid; a doozy.

daisy fleabane
Flowering plants of various species in the genus Erigeron, fleabanes which resemble daisies.
Flowering plants of various species in the genus Erigeron, fleabanes which resemble daisies.
Flowering plants of various species in the genus Erigeron, fleabanes which resemble daisies.

daisycutter
Alternative form of daisy cutter.

daisycutters
plural of daisycutter

dandelions
plural of dandelion

degame
Synonym of lemonwood (“Calycophyllum candidissimum”).

degami
Synonym of lemonwood (“Calycophyllum candidissimum”).

desert dandelion
Flowering plants of genus Malacothrix.

devil's paintbrush
Orange hawkweed (Pilosella aurantiaca).
A Maxim gun.

diazeuxes
plural of diazeuxis

diazeuxis
The separation of two tetrachords by the distance of an octave, as that between the hypaton and hyperboleon tetrachords.

dimorphotheca
Any of several composite plants, of the genus Dimorphotheca, Cape marigolds.

dimorphothecas
plural of dimorphotheca

dog daisy
oxeye daisy (Leucanthemum vulgare)

dog fennel
Alternative form of dogfennel.

dog-fennel
Alternative form of dogfennel.

dogfennel
Anthemis cotula, an annual plant native to Europe and North Africa.
Any of various similar American plants, especially Eupatorium capillifolium, a perennial plant.
A plant in the genus Chamaemelum.

dogfennels
plural of dogfennel

doronicum
Any of several plants of the genus Doronicum, including some called leopardsbane.

doronicums
plural of doronicum

doublet
A pair of two similar or equal things; couple.
One of two or more different words in a language derived from the same etymological root but having different phonological forms (e.g., toucher and toquer in French or shade and shadow in English). See also Appendix:Glossary#doublet.
In textual criticism, two different narrative accounts of the same actual event.
An imitation gem made of two pieces of glass or crystal with a layer of color between them.
A word or phrase set a second time by mistake.
A quantum state of a system with a spin of ½, such that there are two allowed values of the spin component, −½ and +½.
A word (or rather, a halfword) consisting of two bytes.
A very small flowering plant, Dimeresia howellii.
A word ladder puzzle.
An arrangement of two lenses for a microscope, designed to correct spherical aberration and chromatic dispersion, thus rendering the image of an object more clear and distinct.
Either of two dice, each of which, when thrown, has the same number of spots on the face lying uppermost.
A game somewhat like backgammon.
Dipole antenna.
A man’s waistcoat.

doublets
plural of doublet

dublet
Obsolete form of doublet.

dublets
plural of dublet

dusty miller
A formulaic phrase for a miller, related to the dust generated in the milling process.
Any of several species of plants with leaves of a dusty appearance: Centaurea cineraria, Jacobaea maritima, Artemisia stelleriana, Spyridium parvifolium, and Silene coronaria, syn. Lychnis coronaria.

dwarf dandelions
plural of dwarf dandelion

dwarf thistle
Synonym of stemless thistle.

dwarfdandelion
Alternative form of dwarf dandelion.