Globe Chamomile refers to the globe like flower heads.
Matricaria because it was previously in the Matricaria genus
A deeply lobed leaf, erect, annual plant with globular, yellow flower heads in spring on long stalks and with an objectionable smell.
Two. Oval. Tip round. Base tapered. Hairless. No petiole.
Hairy, narrowly egg shaped with an acute tip.
Alternate. Forms a rosette. Strong objectionable smell.
Stipules - None.
Petiole - None.
Blade - Green. Egg shaped to oval in outline, 2 times deeply lobed (i.e. the lobes have lobes also). Lobes parallel sided, less than 1 mm wide, with pointed tips. Hairy with fine hairs.
Stem leaves - Clasping.
Erect, up to 800 mm tall, much branched, longitudinal grooves. Hairy with fine hairs.
Globular, 10 mm diameter, on the ends of long stalks. 2 rows of bracts underneath the flower head.
Yellow. At ends of stems.
Ovary - Conical, elongated receptacle.
'Petals' - None.
Achene, 1-2 mm long by 0.5-1 mm wide, curved, ribbed on the inner face. Pappus is a very small crown of white scales to 1 mm long.
Enclosed in the achene
Achene ribbed on the inner face. Conical, elongated receptacle. Involucre of 2 rows of equal, scarious bracts.
Annual. Germinates in Autumn/winter. Flowers in spring.
Seed Biology and Germination:
Population Dynamics and Dispersal:
Spread by seed.
Origin and History:
Near Moora and in the central wheat belt in WA.
Weed of crops, pastures, roadsides, fallows and disturbed areas.
Not recorded as toxic.
Management and Control:
African Sheep bush (Pentzia incana)
Calomba Daisy (Pentzia suffruticosa)
Plants of similar appearance:
Hussey, B.M.J., Keighery, G.J., Cousens, R.D., Dodd, J. and Lloyd, S.G. (1997). Western Weeds. A guide to the weeds of Western Australia. (Plant Protection Society of Western Australia, Perth, Western Australia). P102. Photo.
Lamp, C. and Collet, F. (1990). A Field Guide to Weeds in Australia. (Inkata Press, Melbourne).
Lazarides, M. and Hince, B. (1993). CSIRO handbook of economic plants of Australia. (CSIRO, Melbourne). #947.1.