Kingdom: Plantae
(Unranked): Angiosperms
(Unranked): Eudicots
(Unranked): Asterids 
Order: Asterales 
Family: Asteraceae 
Tribe: nthemideae 
Genus: Anthemis
Species: A. arvensis
Binomial name: Anthemis arvensis
Common names: Corn chamomile, Field chamomile, Scentless chamomile

Anthemis arvensis is an annual growing to 0.4 m by 0.3 m. It originates from Europe, N. Africa, Caucasian to Iran and Iraq. It is hardy and is not frost tender.
The plant can grow in all soil types (acid or alkaline). It cannot grow in the shade.
The leaves are alternate and pinnately divided. The inflorescence is a single pedunculate flower (1.2cm in diameter, 4-5mm tall) on a stem. It has +/-15 white petals per head (1.5cm long, 5-6mm broad). The yellow centre disk is 1.2cm broad, becoming globose with age.
The flowers are hermaphrodite (Have both male and female organs) and are pollinated by flies, beetles, self. The plant is self-fertile.

1-Anthemis arvensis Mayweed.JPG

Anthemis arvensis Mayweed Corn chamomile-005.JPG

Anthemis arvensis Corn chamomile Scentless chamomile.JPG

Anthemis arvensis Corn chamomile-11.JPG

Anthemis arvensis Corn chamomile Scentless chamomile-001.JPG

1-Anthemis arvensis Mayweed-001.JPG

Anthemis arvensis Mayweed Corn chamomile-004.JPG

The flowers receptacle cut in half.
Anthemis arvensis Corn chamomile-12.JPG

Thanks to Wikipedia for text and information: