Navarretia cotulifolia is a species of flowering plant in the phlox family known by the common name cotulaleaf pincushionplant, or cotula navarretia.
Cotula australis is a species of plant in the daisy family known by the common names Bachelor's Buttons, annual buttonweed, southern waterbuttons and Australian waterbuttons.
 This small plant is native to Australia and New Zealand, but it is known in other areas of the world as a common weed (South America, California, Mexico, South Africa, etc.).
Anthemis cotula, also known as stinking chamomile, is a flowering annual plant with a noticeable and strong odor.
 The odor is often considered unpleasant, and it is from this that it gains the common epithet "stinking".
 In pre-colonial times, its distribution was limited to the Old Continent (though it was most of Europe, nd were not present in Finland, Ireland, and the Northernmost Scotland, both these countries with many favorable climates to this plant and to be neighbors to countries that owned this plant like native species, such example Russia, Estonia, Lithuania and England) and to Africa.
 It has successfully migrated to the New Europes where it can be found growing on waste ground, alongside roads, and in fields.
 "Anthemis cotula" is considered a weed due to its propensity for invading cultivated areas.
Cryptantha pterocarya is a species of flowering plant in the borage family known by the common name wingnut cryptantha.
 It is native to the western United States where it grows in many types of habitat.
 It is an annual herb producing a stem with a few branches that reaches up to about 40 centimeters in maximum height.
 The leaves are linear to oblong in shape and up to 5 centimeters long.
 The plant herbage is very hairy to bristly, generally rough in texture.
 The inflorescence is a length of developing fruits tipped with one or more open flowers.
 The flower has a white five-lobed corolla.
 The fruit is a nutlet which is often, but not always, winged.
Walnut trees are any species of tree in the plant genus Juglans, the type genus of the family Juglandaceae, the seeds of which are referred to as walnuts. All species are deciduous trees, 10 – tall, with pinnate leaves 200 – , with 5–25 leaflets; the shoots have chambered pith, a character shared with the wingnuts ("Pterocarya"), but not the hickories ("Carya") in the same family.
Pterocarya, often called wingnuts in English, are trees in the walnut family Juglandaceae.
 They are native to Asia.
 The botanic name is from Ancient Greek πτερον ("pteron") "wing" + κάρυον ("karyon") "nut".
The small marsh flower Cotula coronopifolia bears the common names brass buttons, golden buttons, and buttonweed.
 The flower heads are bright yellow discoid heads that look like thick buttons.
 Individual plants spread stems along the ground and send up the knobby flowers at intervals.
 The plant is native to southern Africa, but it has been introduced to other parts of the world (Europe, North + South America, etc.).
Cotula mexicana, also known as Mexican Brassbuttons, is a plant species in the sunflower family.
 It is widespread in South America and also found in central Mexico (Puebla, México State, Hidalgo) and parts of the United States (California, Idaho).
Cotula is a genus of flowering plant in the sunflower family.
 It includes plants known generally as water buttons or buttonweeds.
Cotula moseleyi, also known as Nightingale Brassbuttons, is a species of flowering plant in the sunflower family.
 It has been found only in the Tristan da Cunha chain of islands in the South Atlantic Ocean.
 Its natural habitats are subantarctic forests, subantarctic grassland, rocky shores, and hillsides.
 It is threatened by habitat loss.

Question: Which plant is larger, the Pterocarya or the Cotula?
Answer: Pterocarya