Appearance
* Height: 20–80 cm . Usually 1-stemmed. Stem erect–ascending, branching, glabrous, green.⤷ Flower: Single flower-like, usually 3–5 cm 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 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 , glabrous, lobes 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
Naming
Historically included the genus Matricaria, ''Tripleurospermum inodorum'' has been the subject of some controversy, with many revisions in recent years. The Flora Europaea uses ''Matricaria perforata'' for this species. Synonyms/other scientific names include ''Tripleurospermum perforatum'' Lainz, ''Tripleurospermum maritimum'' subsp. ''inodorum''.References:
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