- Subspecies: Ssp. hastata, Ssp. subintegrifolia
- Family: Willow Family – Salicaceae
- Growing form and height: Shrub, 0.5–1 m (ssp. hastata), 1–2.5 m (ssp. subintegrifolia).
- Flowering time: May–June. Flowers when coming into leaf.
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Hybrids between willow species are common. Halberd willow crossbreeds commonly with woolly willow (S. lanata) and in Enontekiö area (North Lapland) also with dwarf willow (S. herbacea).