Euphorbia segetalis L.

Species description

Annual herb, glabrous. Stem 20-60 cm, erect, simple or rarely branched. Leaves linear to linear-lanceolate, 1-3 mm wide, 5-20 times longer than wide, dense at least in the lower part of the stem, with entire margins. Stipules absent. The terminal inflorescence is an umbel, with 5-7 stems of 1st order (these stems often dichotomous). Supporting bracts in individual inflorescences are unbranched, semicircular in outline (often wider than length), triangular or rhombic, with a small attached tip, which is formed by a central nerve. The glands of the enveloping calyx 2-4, yellow, with horn-shaped appendages that may reach 1.5 mm in length. Capsule 3-3.5 mm long, often scabrous on the back of the 3 fruit segments. Seeds ovate 2.4-2.9 mm long, 1.3-1.7 mm thick, with fine shallow depressions arranged in a grid.

Life form

Habitats

Ecological indicator values by © Landolt & al. (2010)

Soil factors		Climatic factors		Salinity tolerance
Humidity Value H	2	Light Value L	4	Salinity Index	--
Reaction Value R	4	Temperature factor T	5
Nutriments value N	4	Continentality K	3

• Ecological values legend
  

  Humidity Value H
  1	very dry
  1+	dry
  2	moderatly dry
  2+	moist
  3	medium wet
  3+	wet
  4	very wet
  4+	soggy
  5	submerged or underwater
  f	plants living in running water
  u	mostly submerged plants
  v	partly submerged, partly floating plants
  w	humidity moderately variable (± scale of 1-2)
  w+	highly variable humidity (scale exceeding ± 2)

  Reaction Value R
  1	Very acid (pH 2.5-5.5)
  2	acid (pH 3.5-6.5)
  3	lightly acid to neutral (pH 4.5-7.5)
  4	neutral to basic (pH 5.5-8.5)
  5	basic (pH 6-5 -> 8.5

  Nutriments value N
  1	very low in nutrients
  2	low in nutriments
  3	medium-poor to medium-rich in nutrients
  4	rich in nutriments
  5	very rich in nutriments

  Salinity tolerance
  1	halotolerant
  3	halophyle

  Light Value L
  1	very shady
  2	shady
  3	lighted areas
  4	luminous
  5	highly luminous

  Temperature factor T
  1	alpine to nival stages (from the treeline to the snowline)
  1+	suprasubalpine and upper subalpine levels (pine and larch forests)
  2	subalpine level (coniferous forests without beeches up to the upper limit of spruces)
  2+	lower subalpine and upper mountain stages
  3	mountain level (beech and silver fir forests, in the central Alps Scots pine forests)
  3+	lower mountain and upper hill levels
  4	hill level (mixed deciduous oak forests)
  4+	hot places, hill level
  5	very hot places, hill level (only in the hottest places, typical of southern Europe)

  Continentality K
  1	Atlantic (high air humidity, very low temperature variations, mild winters)
  2	Sub-Atlantic (high air humidity, low temperature variations, relatively mild winters)
  3	sub-Atlantic to subcontinental (average air humidity, moderately variable temperature, slightly low winter temperatures)
  4	subcontinental (low air humidity, large temperature variations, rather cold winters)
  5	continental (very low air humidity, very large temperature variations, cold winters)

Match with other reference books

Relation	Nom	Book	No
=	Euphorbia segetalis L.	Checklist 2017	161200
=	Euphorbia segetalis L.	Flora Helvetica 2001	1327
=	Euphorbia segetalis L.	Flora Helvetica 2012	795
=	Euphorbia segetalis L.	Index synonymique 1996	161200
=	Euphorbia segetalis L.	Landolt 1977	1968
=	Euphorbia segetalis L.	Landolt 1991	1611
=	Euphorbia segetalis L.	SISF/ISFS 2	161200
=	Euphorbia segetalis L.	Welten & Sutter 1982	976