Scientific Name:
Valerianella Mill., Gard. Dict., ed. 4, 3, (1754)

Annual herbs.  Lvs simple and entire to sinuate or dentate.  Cymes numerous, small and conspicuously bracteate, or rarely fls solitary.  Fls small and inconspicuous, often overtopped by subtending bracts.  Calyx variously developed, usually conspicuous or reduced to a ring of inconspicuous teeth, sometimes 0, forming a pappus or not at fruiting. Corolla ± actinomorphic;  tube lacking a basal spur, but sometimes slightly gibbous.  Stamens 3.  Fr. flattened to 3–4-angled or rounded in cross-section, glabrous, hairy or echinate.

[From:  Webb et al. (1988) Flora of New Zealand. Volume 4.]

Number of species in New Zealand within Valerianella Mill.
Exotic: Fully Naturalised2
Mabberley, D.J. 2008: Mabberley's plant book, a portable dictionary of plants, their classification and uses. Edition 3. Cambridge University Press.
Miller, P. 1754: The Gardeners Dictionary. Vol. 3. Edition 4. London.