THE SPURGE FAMILY (Euphorbiaceae)
This is a large family of flowering plants with 300 genera and around 7,500 species. Most spurges are herbs, but some, especially in the tropics, are shrubs or trees. Some are succulent and resemble cacti.
Members of the genus Euphorbia (to which the species found here in the Lobau belong) have varying leaf forms but are mainly characterised by their unusual flower structure and milky latex exuded from stem and leaves when broken. This latex is poisonous and can cause skin irritations if the plant is handled.
The flowers consist of a highly specialized "false flower" made up of several ‘true’ flowers, each separately either male or female. This false flower is usually a small, cup-like involucre consisting of fused-together bracts and peripheral nectary glands surrounding a ring of male flowers, each a single stamen. In the middle stands a female flower: a single pistil with branched stigmas. This whole arrangement resembles a single flower but the appearance is bizarre.
(source: Wikipedia)
Click on a thumbnail photo to go to full photo and description.
Lobau Location
QUICK KEY
Leaf Types (Simplified)
Flower Types (Simplified)
Structured Clusters
5, small
Inflorescence Types (Simplified)
©
2011 Margaret Eros
LEAF TYPE
PETAL TYPE
INFLORES- CENCE TYPE
HEIGHT OF PLANT
FLOWERING MONTH
HABITAT
PHOTO LOCATION
Cypress Spurge
Euphorbia cyparissias
Other common name(s):
German name(s):
Zypressen-Wolfsmilch
Date:
03 May, 2011
©
2011 Margaret Eros
LEAF TYPE
PETAL TYPE
INFLORES- CENCE TYPE
HEIGHT OF PLANT
FLOWERING MONTH
HABITAT
PHOTO LOCATION
Siberian Spurge
Euphorbia seguieriana
Other common name(s):
German name(s):
Steppen-Wolfsmilch
Date:
18 May, 2011
Cypress spurge is a native of Europe and it thrives in open, disturbed areas and dry grassland. It has soft, narrow leaves that, particularly on non-flowering stems, look like a branch of fir or cypress (see !F! button below). The flowers are unusual in form, the petal-like bracts greenish yellow in colour to begin with, turning pink and then deep red as the flower matures. The main attraction for pollinators are the waxy yellow nectaries, each a horned crescent shape but arranged in a circle giving the impression of a tiny fleshy flower. The other flower parts are difficult to discern with the naked eye but the fruit develops into a very visible warty structure, eventually exploding and shooting the seeds 4-5 metres from the parent plant. Seeds also possess an oily attachment, attracting ants that can aid dispersal. The plant additionally reproduces through lateral root buds, which allow it to spread densely.
When damaged, the plant exudes poisonous latex that protects it from being eaten and heals the wound but it is a serious irritant to the human skin, particularly if in contact with eyes, and can produce painful blisters. It is instinctively avoided by cattle but can poison them if inadvertently eaten with hay.
The rust fungal parasite, Uromyces pisi, uses Cypress Spurge as a host and completely hi-jacks its metabolism, preventing it from flowering and causing it to grow in a different way, tall, upright and with broader leaves, favouring the spread of the fungus. Infected individuals can often be seen amongst the healthy ones and can be easily mistaken for a different species. (see !P! button below)