Scorzonera humilis

Viper's grass
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Asterids
Order:	Asterales
Family:	Asteraceae
Genus:	Scorzonera
Species:	S. humilis
Binomial name
Scorzonera humilis L.

Scorzonera humilis, the viper's-grass,^[1] is a perennial plant. In Britain it is a rare plant, restricted to moist meadows, in Dorset and Warwick in England, and in South Wales.

One unique class of stilbenoid derivative was first isolated from S. humilis. They were named the tyrolobibenzyls after Tyrol in the eastern Alps, where the plant was collected.^[2]

Description

It differs from goat's-beard, Tragopogon pratensis, in that it has short, pale green bracts, whereas in Goats Beard they are long and pointed.

It grows 7 to 50cm.

The leaves are unbranched, elliptical-lanceolate.

The flower heads are 2.5cm wide, and deep yellow in colour. Flowers from May until July.

The achenes are smooth ribbed, beakless, with similar pappus to Tragopogon pratensis.

It exudes a milky juice from its stem.

^{[3] [4]}

References

1. "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-02-25. Retrieved 2014-10-17.
2. Zidorn, C. et al. (2000). "Tyrolobibenzyls ‒ Novel secondary metabolites from Scorzonera humilis". Helvetica Chimica Acta (Zürich; Switzerland) 83: 2920–25. doi:10.1002/1522-2675(20001108)83:11<2920::AID-HLCA2920>3.0.CO;2-5. ISSN 0018-019X.
3. Blamey, Fitter, Fitter, Marjorie, Richard, Alistair (2003). Wild Flowers of Britain and Ireland. A & C Black - London. pp. 294–295. ISBN 0-7136-5944-0.
4. Rose, Francis (1981). The Wild Flower Key. Frederick Warne & Co. pp. 390–391. ISBN 0-7232-2419-6.