Delphinium newtonianum
Delphinium newtonianum is a species of flowering plant in the family Ranunculaceae. It is endemic to the Interior Highlands of Arkansas in the United States.
Description
Delphinium newtonianum is a perennial herb with slender, tuberous, clustered roots and stems that are simple below and loosely branched above, typically reaching 30–130 cm in height. Leaves are deeply divided into three primary lobes, with lower leaves further subdivided into additional lobules.
The inflorescence is an open, spreading cymose panicle. Flowers are typically bright blue but may also be lavender or white, with spreading sepals and a curved or arched spur approximately 2 cm long. The fruits are glabrous, strongly divergent follicles.
Habitat and ecology
The species occurs on forested slopes and in mesic to dry-mesic habitats within the Interior Highlands, including the Boston Mountains and Ouachita Mountains. It grows in temperate forest environments and is associated with upland woodland habitats.
The species flowers from late June to early July.
Distribution
Delphinium newtonianum is endemic to Arkansas, where it occurs in the Interior Highlands region. It was originally described from Newton and Pope counties, Arkansas.
Occurrence data compiled by the Global Biodiversity Information Facility (GBIF) include numerous herbarium specimens and verified observations from across its limited range.
Taxonomy
Delphinium newtonianum was described by Dwight M. Moore in 1939 in the journal Rhodora. The type material originates from Arkansas.
Moore noted that the species was highly distinct, particularly in its inflorescence, and suggested it might warrant placement in a separate section of the genus, though he retained it within Delphinium pending further study.
The species is widely accepted by modern taxonomic authorities.
Conservation
According to NatureServe, Delphinium newtonianum is ranked G3 (vulnerable), reflecting its restricted range and limited number of occurrences. It is considered secure in parts of its range but remains of conservation concern due to its endemism.
Several populations occur on protected lands, including within the Ozark National Forest.
References
newtonianum Category:Endemic flora of the United States Category:Plants described in 1939