Anthemis arvensis L. - Corn Chamomile

Anthemis arvensis plant

Family - Asteraceae

Stems - Herbaceous, erect to ascending, from fibrous roots, multiple from the base, branching, arachnoid pubescent (less so near base), carinate at apex, green to red in strong sun.

Anthemis arvensis stem

Leaves - Alternate, pinnately divided. Divisions of leaf pinnatifid. Ultimate leaf divisions acute, minutely mucronate. Leaves to 5cm long, 2cm broad, sparse pubescent and punctate (use lens) adaxially, arachnoid pubescent below. Petiole with fimbriate divisions.

Anthemis arvensis leaves

Inflorescence - Single pedunculate flower clusters terminating stems.

Involucre - 1.2cm in diameter, 4-5mm tall. Phyllaries in one or two series, slightly imbricated, to 5mm long, 2mm broad, scarious, with a green midvein, arachnoid pubescent externally, glabrous internally.

Anthemis arvensis involucreInvolucre.

Ray flowers - Pistillate, fertile, +/-15 per head. Ligule white, -1.5cm long, 5-6mm broad, glabrous, 2-3-notched at apex, oblong. Corolla tube to 2mm long, greenish. Style bifurcate, exserted. Achene 1.5mm long in flower, light green, glabrous, truncate at base. Pappus none.

Disk flowers - Disk to 1.2cm broad, becoming globose with age. Corolla -3mm long, translucent at base, becoming yellow at apex, 5-lobed, expanded in apical 1/2. Lobes acute, to .6mm long, recurved. Stamens 5, adnate at base of corolla tube constriction. Filaments very short. Anthers yellow, included, 1.1mm long, connate around style. Style barely exserted beyond anthers, translucent-yellow. Stigmatic portion of style .5mm long. Achene translucent in flower, 1.3mm long, glabrous. Pappus none. Receptacle conic. Chaff thin, translucent, 3mm long, .4mm broad, slightly folded, glabrous, acuminate, linear.

Anthemis arvensis flowers

Anthemis arvensis flowersMature flower head.

Flowering - May - September.

Habitat - Fields, roadsides, railroads.

Origin - Native to Europe.

Other info. - This species can be found scattered throughout Missouri but is uncommon. It can be identified by its divided leaves and Chrysanthemum-like flower heads. The plant is sometimes cultivated. The flowers which occur on the plant in later months are much smaller than those of the early season.

Photographs taken in Brown Summit, NC., 5-17-02, and off Hwy 24, TN., 5-10-04.


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