Cerastium is from the Greek word kerastes meaning horned and refers to the shape of the capsule.
Sticky Mouse eared Chickweed refers to the sticky nature of the mouse eared shaped leaves.
Mouse eared Chickweed
A hairy, hollow stemmed, annual herb with tight clusters of white flowers in spring with 5 lobed petals. The opposite leaves look like mouse ears.
Two. The cotyledon is 1.5 to 6 mm long overall, oval, with a short merging petiole and is hairless though some hairs may be present at the base of the petiole. The tip is slightly pointed. Base tapered. The seedling has a short hypocotyl and a short epicotyl.
The leaves are paired and in the early stages are 5 to 10 mm long overall, oval, with a short petiole. Long hairs are present on the upper and lower leaf surfaces and the leaves are yellowish/green in colour. There is a small point on the tip.
The plant does not form a rosette. Opposite leaves, united at the base to encircle the stem.
Stipules - None
Petiole - Short and shorter in later leaves or none.
Blade - Often sticky to touch, light green, hairy, egg shaped to lance or spade shaped like a mouses ear. Glandular and or simple and or multi cellular hairs. Tip pointed.
Stem leaves - Upper stem leaves are egg shaped to oblong or elliptical, sessile and semi-clasping with an obtuse or acute tip. They are 5-25 mm long by 3-12 mm wide, glandular and simple hairs, and are yellow/green in colour. In some cases the glandular hairs which are normally a distinctive feature in this species are present in small numbers only.
Initially erect but tend to become prostrate and straggling in older plants. Many branched at the base and reach 70-450 mm vertically or 500 mm when horizontal. They are circular in cross section and hollow with both glandular and simple hairs.
Compact, forked cyme at the ends of stems.
5 to 10 mm in diameter. Bisexual. Flower stalks, slender, 2-7 mm long, shorter than the sepals.
Levantine Mouse-eared Chickweed (Cerastium comatum) has established at Hillman Nature Reserve near Darkan and a reserve near Wickepin.
Little Mouse eared Chickweed. (Cerastium semidecandrum)
Mouse-eared Chickweed (Cerastium fontanum or holosteoides)
Sea Mouse-eared Chickweed (Cerastium diffusum)
Plants of similar appearance:
Sticky Mouse-ear Chickweed is extremely difficult to distinguish from Mouse-ear Chickweed in the early stages. In the mature plant the yellow/green colour and the much broader base of the leaf distinguishes it from the latter. The inflorescence is very much more tightly clustered than that of Mouse-ear Chickweed. The presence of large numbers of glandular hairs on the stem and leaves will confirm the identification of this species but individuals with relatively few or no glandular hairs are not uncommon. The Mouse-ear Chickweeds are, in the seedling stage, superficially similar to Chickweed and Montia. The presence of hairs on the leaves separate the Mouse-ear Chickweeds from these other species. Chickweed leaves have a long thin petiole. The leaves of Montia are relatively thick, stiff, and fleshy.
Cerastium holosteoides, C. fontanum ssp. triviale, C. vulgatum are very similar to C. glomeratum but are perennial .
Australian Crassula, Dense Crassula, Spreading Crassula (Crassula spp.)
Chickweed (Stellaria media)
Four-leaved Allseed (Polycarpon tetraphyllum)
Pearlwort (Sagina apetala)
Pimpernel (Anagallis arvensis)
Waterblinks (Montia spp.)
Pigweed (Portulaca spp.)
Auld, B.A. and Medd R.W. (1992). Weeds. An illustrated botanical guide to the weeds of Australia. (Inkata Press, Melbourne). P143. Diagram. Photo.
Black, J.M. (1965). Flora of South Australia. (Government Printer, Adelaide, South Australia). P354. Diagram.
Burbidge, N.T. and Gray, M. (1970). Flora of the Australian Capital Territory. (Australian National University Press, Canberra). P164-165. Diagram.
Cunningham, G.M., Mulham, W.E., Milthorpe, P.L. and Leigh, J.H. (1992). Plants of Western New South Wales. (Inkata Press, Melbourne). P300. Photo.
Hyde-Wyatt, B.H. and Morris, D.I. (1975). Tasmanian weed handbook. (Tasmanian Department of Agriculture, Hobart, Tasmania). P76-77. Diagrams.
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). #285.5.
Marchant, N.G., Wheeler, J.R., Rye, B.L., Bennett, E.M., Lander, N.S. and Macfarlane, T.D. (1987). Flora of the Perth Region. (Western Australian Herbarium, Department of Agriculture, Western Australia). P105.