L., Sp. Pl. 458 (1753).
Synonymy: Not Applicable
Common name: Short stem carnation weed, cornfield-spurge.
Glabrous erect ascending annual, rarely perennating, to 35 cm tall, simple or branched with usually 4 or 5 axillary rays up to 5 times dichotomous, the umbel usually as long as or longer than the stem, green, maturing reddish; cauline leaves spreading, linear to linear-lanceolate, 15-40 (rarely to 60) x 1-3 mm, entire, somewhat glaucous, eventually caducous; ray-leaves elliptic-oblong, wider and shorter than the cauline; raylet-leaves ovate or deltate-rhombic, obtuse or mucronate, cuneate to subcordate, 2-10 x 3-20 mm, terminal ones replacing the bracts.
Cyathia solitary at the base of the forks axillary or up to 3 terminally; involucre campanulate, c. 1 mm long and wide, attenuated into a very short peduncle; glands lunate, to 1 mm long, yellow, emarginate or with usually 2 rarely 4 long horns; styles ascending, divided to the middle, filiform, capitate.
Capsule depressed-globose, 3-lobed, 2.5-3 x 3-3.5 mm, deeply grooved, granulate-wrinkled on the back; seed ovoid, c. 2 x 1.6 mm, ash-grey, dark-pitted all over; caruncle pyramidal, yellow terminally, often white basally.
||Euphorbia segetalis twig, cyathium, fruit and seed.
Image source: fig 402g in Jessop J.P. & Toelken H.R. (Ed.) 1986. Flora of South Australia (4th edn).|
Fiori & Paoletti (1901) Iconographiae florae Italicae, fig. 2601; Hegi (1924) Illustrierte Flora von Mittel-Europa 5, 1:fig. 1794.
S.Aust.: SL. W.Aust. Native to the Mediterranean region, naturalised as a garden weed.
Flowering time: apparently throughout the year.
SA Distribution Map based
on current data relating to
specimens held in the
State Herbarium of South Australia
When cauline leaves are shed at maturity shows similarities with E. terracina in which the glands always have only 2 long horns, while E. segetalis has 2 or 4 or lacks them on some glands.
Not yet available