Height: 20–80 cm (8–32 in.).
Usually 1-stemmed.
Stem erect–ascending, branching, glabrous, green.

Flower: Single flower-like, usually 3–5 cm (1.2–2 in.)
capitula, surrounded by involucral bracts.
Capitula's ray-florets white, tongue-like, tip shallowly 3-toothed; disc florets yellow, tubular, small.
Stamens 5.
Pistil of 2 fused carpels.
Involucral bracts different lengths, 1–1.5 mm (0.04–0.06 in.)
broad, light brown–white margins.
Disc stacked, full.
Capitula 1–20 borne in a corymbose cluster.

Cotyledons：oribicular to oblong， very small，3 to 5 mm long, Stalkless
Leaves and stems: Alternate, short-stalked–stalkless.
Blade 2–3 times pinnately lobed (–with leaflets), glabrous, lobes (or leaflets) long, thread-like narrow, sharp-pointed.
Leaves are ¾ to 3 inches long, feathery with a few to numerous thread-like branching lobes.
Stems are single, erect, branched in the upper plant, weakly ridged or lined, hairless though sparsely hairy when young.

Fruit: Flattish, ridged achene, with 2 round–angular oil spots, tip sometimes with small, membranous ring.

Habitat: Fields, fallow land, lawns, wasteland, roadsides, yards, gardens.

Flowering time: June–October.

Life cycle: annual, short-lived perennial
Pollen is collected by solitary bees.

Ecological definition: Weed.
Tripleurospermum inodorum has been classified as a noxious weed (class C) in the state of Washington and is considered invasive in other states (it is resistant to some herbicides); it is a weed of cereals in western Canada.
W. L. Applequist (2002) has shown that the name Matricaria inodora is not a superfluous new name for M. chamomilla as earlier stated by S. Rauschert (1974).
Therefore, the appropriate name under Tripleuro-spermum is T. inodorum.
She also considered its type to belong in T. maritimum and formally recognized it there as subsp.
inodorum, on the basis of hybridization with other T. maritimum subspecies (A. Vaarama 1953); on the same basis, however, Hämet-Ahti maintained the species distinction between T. inodorum and T. maritimum, while making T. phaeocephalum a subspecies of the latter.
 According to Canadian regulations, it is classified as Secondary Noxious, Class 3 and Noxious, Class 5 in the Canadian Weed Seeds Order, 2016 under the Seeds Act.
Height: 20–80 cm (8–32 in.). Usually 1-stemmed. Stem erect–ascending, branching, glabrous, green.
Flower: Single flower-like, usually 3–5 cm (1.2–2 in.) capitula, surrounded by involucral bracts. Capitula's ray-florets white, tongue-like, tip shallowly 3-toothed; disc florets yellow, tubular, small. Stamens 5. Pistil of 2 fused carpels. Involucral bracts different lengths, 1–1.5 mm (0.04–0.06 in.) broad, light brown–white margins. Disc stacked, full. Capitula 1–20 borne in a corymbose cluster.
Cotyledons：oribicular to oblong， very small，3 to 5 mm long, Stalkless
Leaves and stems: Alternate, short-stalked–stalkless. Blade 2–3 times pinnately lobed (–with leaflets), glabrous, lobes (or leaflets) long, thread-like narrow, sharp-pointed. Leaves are ¾ to 3 inches long, feathery with a few to numerous thread-like branching lobes. Stems are single, erect, branched in the upper plant, weakly ridged or lined, hairless though sparsely hairy when young.
Fruit: Flattish, ridged achene, with 2 round–angular oil spots, tip sometimes with small, membranous ring.
Habitat: Fields, fallow land, lawns, wasteland, roadsides, yards, gardens.
Flowering time: June–October.
Life cycle: annual, short-lived perennial
Pollen is collected by solitary bees.
Ecological definition: Weed. Tripleurospermum inodorum has been classified as a noxious weed (class C) in the state of Washington and is considered invasive in other states (it is resistant to some herbicides); it is a weed of cereals in western Canada. W. L. Applequist (2002) has shown that the name Matricaria inodora is not a superfluous new name for M. chamomilla as earlier stated by S. Rauschert (1974). Therefore, the appropriate name under Tripleuro-spermum is T. inodorum. She also considered its type to belong in T. maritimum and formally recognized it there as subsp. inodorum, on the basis of hybridization with other T. maritimum subspecies (A. Vaarama 1953); on the same basis, however, Hämet-Ahti maintained the species distinction between T. inodorum and T. maritimum, while making T. phaeocephalum a subspecies of the latter.  According to Canadian regulations, it is classified as Secondary Noxious, Class 3 and Noxious, Class 5 in the Canadian Weed Seeds Order, 2016 under the Seeds Act.
Tripleurospermum inodorum