''Pisoniella'' is a

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...

genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...

s belonging to the family

Nyctaginaceae Nyctaginaceae, the four o'clock family, is a family of around 33 genera and 290 species of flowering plants, widely distributed in tropical and subtropical regions, with a few representatives in temperate regions. The family has a unique fruit t ...

. It only contains one known species, ''Pisoniella arborescens'' It is native to (northwestern) Argentina, Bolivia and Mexico. The genus name of ''Pisoniella'' is in honour of

Willem Piso Willem Piso (in Dutch Willem Pies, in Latin Gulielmus Piso, also called Guilherme Piso in Portuguese) (1611 in Leiden – 28 November 1678 in Amsterdam) was a Dutch physician and naturalist who participated as an expedition doctor in D ...

(1611–1678), a Dutch physician and naturalist who participated as an expedition doctor in

Dutch Brazil Dutch Brazil ( nl, Nederlands-Brazilië), also known as New Holland ( nl, Nieuw-Holland), was a colony of the Dutch Republic in the northeastern portion of modern-day Brazil, controlled from 1630 to 1654 during Dutch colonization of the America ...

from 1637 – 1644. The Latin specific epithet of ''arborescens'' refers to ''arboreus'' meaning tree-like. Both the genus and the species were first described and published in Contr. U.S. Natl. Herb. Vol.13 on page 385 in 1911. it has one known subspecies; ''Pisoniella arborescens'' var. ''glabrata'' from Bolivia and northwestern Argentina.

References

{{Taxonbar, from1=Q10350082, from2=Q15471921 Nyctaginaceae Caryophyllales genera Plants described in 1911 Flora of Bolivia Flora of Mexico Flora of Northwest Argentina