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Helix
A helix (/ˈhiːlɪks/; pl. helices) is a shape like a cylindrical coil spring or the thread of a machine screw. It is a type of smooth space curve with tangent lines at a constant angle to a fixed axis. Helices are important in biology, as the DNA molecule is formed as two intertwined helices, and many proteins have helical substructures, known as alpha helices. The word helix comes from the Greek word ἕλιξ, "twisted, curved". A "filled-in"
30 branches of this group, most-observed first
Purple Willow
speciesSalix purpurea
dappled willow
speciesSalix integra
Salix vinogradovii
speciesSalix vinogradovii
Salix kochiana
speciesSalix kochiana
Salix elbrusensis
speciesSalix elbrusensis
Salix koriyanagi
speciesSalix koriyanagi
Blue-green Willow
speciesSalix caesia
Salix miyabeana
speciesSalix miyabeana
Salix ledebouriana
speciesSalix ledebouriana
Salix amplexicaulis
speciesSalix amplexicaulis
Salix caspica
speciesSalix caspica
Salix suchowensis
speciesSalix suchowensis
Salix pycnostachya
speciesSalix pycnostachya
Salix capusii
speciesSalix capusii
Salix niedzwieckii
speciesSalix niedzwieckii
Salix gilgiana
speciesSalix gilgiana
Salix tenuijulis
speciesSalix tenuijulis
Salix blakii
speciesSalix blakii
Salix olgae
speciesSalix olgae
Salix carmanica
speciesSalix carmanica
Salix donggouxianica
speciesSalix donggouxianica
Salix gracilior
speciesSalix gracilior
Salix koeieana
speciesSalix koeieana
Salix sungkianica
speciesSalix sungkianica
Salix tarbagataica
speciesSalix tarbagataica
Salix yanbianica
speciesSalix yanbianica
Salix yumenensis
speciesSalix yumenensis
Salix michelsonii
speciesSalix michelsonii
Salix kirilowiana
speciesSalix kirilowiana
Salix rizeensis
speciesSalix rizeensis
Where it lives
Recorded sightings
—
geo-referenced records in GBIF, from museums, herbaria and field observers.
Drag the globe to turn it. Dots are where records exist, not a range map; darker means more records.
In the old herbals & bestiaries
De medicinali materia libri sex
Dioscorides · 1552 · p.349
Garden of Health
Jacob Meydenbach · 1491 · p.160
Living Images of Plants
Otto Brunfels · 1532 · p.345
Notable Commentaries on the History of Plants
Leonhart Fuchs · 1549 · p.455
On Medical Materials in Six Books
Dioscorides · 1550 · p.341
Commentaries on the Six Books of Dioscorides
Pietro Andrea Mattioli · 1560 · p.454
Commentaries on the Six Books of Pedanius Dioscorides on Medical Matter
Pietro Andrea Mattioli · 1565 · p.797
In the stacks
Searching the stacks…
Every page naming Helix in the Biodiversity Heritage Library →
This page is assembled live from iNaturalist, GBIF, Wikipedia, the Source Library and the Internet Archive. It is not yet part of the hand-edited codex. iNaturalist taxon 1237189.