Derick B. Poindexter

• Doctor of Philosophy
• University of North Carolina at Chapel Hill

A new species of Helianthus (Asteraceae), Helianthus waccamawensis Ungberg, sp. nov., is described from the Cape Fear Arch Region of North and South Carolina. Most recently, it has been included in H. floridanus A. Gray ex Chapm. but differs in its narrower leaves, achene and floral morphology, and habitat preferences. It superficially resembles H....

As part of ongoing work on the Flora of the Southeastern United States (Weakley & Southeastern Flora Team 2023) and related projects, as well as for general floristic, conservation, and scientific work in eastern North America, it is essential to document taxonomic and nomenclatural changes and significant distribution records. Here, we propose six...

As part of ongoing work on the Flora of the Southeastern United States (Weakley & Southeastern Flora Team 2022a) and related projects, as well as for general floristic, conservation, and scientific work in eastern North America, it is essential to document taxonomic and nomenclatural changes and significant distribution records. Here we describe th...

Trichostema section Trichostema occurs in the North American Coastal Plain biodiversity hotspot. Much of the previously noted morphological diversity in this section has so far gone unstudied. A combination of extensive field studies, principal components analyses and statistical tests on morphological data, common garden experiments, nextRAD seque...

As part of ongoing efforts to understand, document, and conserve the flora of the southeastern United States, we make new combinations to accord with our generic taxonomy, name a new hybrid, re-recognize a species relegated to synonymy in recent decades, lectotypify and generally clarify nomenclatural issues in several genera, clarify taxonomy and...

As part of ongoing efforts to understand, document, and conserve the flora of southeastern North America, we propose two new species, the recognition of a usually synonymized variety, the acceptance of two species of Waltheria as being present in peninsular Florida, taxonomic acceptance of a sometimes deprecated species transferred with a new name...

As part of ongoing efforts to understand, document, and conserve the flora of southeastern North America, we propose a number of taxo-nomic changes, nomenclatural changes, interpretations of nativity, and distributional accounts. Regarding the Asaroideae (Aristolochiaceae), we support continued recognition of Hexastylis (and other segregates of a v...

Marshallia grandiflora (asteraceae, Helenieae, Marshalliinae) is recognized as the 53 rd extinct species to North america, and an endemic species of the Blue Ridge physiographic province of North Carolina. a new name, Marshallia pulchra, is provided for the more broadly ranging species that has been confounded with and generally considered conspeci...

Premise: Counting chromosomes is a fundamental botanical technique, yet it is often intimidating and increasingly sidestepped. Once mastered, the basic protocol can be applied to a broad range of taxa and research questions. It also reveals an aspect of the plant genome that is accessible with only the most basic of resources-access to a microscop...

As part of ongoing efforts to understand and document the flora of the southeastern United States, we propose a number of taxonomic changes and report a distributional record. In Rhynchospora (Cyperaceae), we elevate the well-marked R. glomerata var. angusta to species rank. In Dryopteris (Dryopteridaceae), we report a state distributional record f...

As part of ongoing efforts to understand and document the flora of the southeastern United States, a number of taxonomic changes at generic, specific, and infraspecific rank are made. We also discuss and clarify the recommended taxonomy for other taxa (not requiring nomenclatural acts) and present a point of view about the practical and philosophic...

As part of ongoing efforts to understand and document the flora of the southeastern United States, a number of taxonomic changes at generic , specific, and infraspecific rank are made. We also discuss and clarify the recommended taxonomy for other taxa (not requiring nomenclatural acts) and present a point of view about the practical and philosophi...

In 1906, Clarke described C. hypsipedos based on specimens of Weberbauer 2617 and placed this species in subgenus Vignea. In 1909, Kükenthal also described the name C. umbellata var. depressa on the basis of the number Weberbauer 2617, a species attributed to section Acrocystis of subgenus Carex. Wheeler in 1988 also placed C. hypsipedos in section...

A new species of Scleria (Cyperaceae) is described from the southeastern United States, Cuba, and Mexico. Although widespread, known populations are few and scattered, with 14 in the United States from North Carolina to Texas, and one each in Cuba and Mexico. In the United States, 12 populations are found on the outer Coastal Plain, and two in the...

Cited voucher specimens document Carex albicans var. emmonsii new to Mississippi, C. floridana new to New Jersey and Tennessee, C. reznicekii new to Florida, C. tonsa var. rugosperma new to Tennessee, and C. tonsa var. tonsa new to Kentucky and Tennessee. Members of Carex sect. Acrocystis Dumort. (Cyperaceae) are serious identification challenges i...

Stipulicida is a narrowly endemic, monotypic genus as currently circumscribed. Previous studies have attempted to diagnose additional taxa within the genus, but only one species comprised of two varieties is currently accepted. These two varieties, Stipulicida setacea var. setacea and S. setacea var. lacerata, demonstrate significant phenotypic div...

Abstract. Carex lucorum currently comprises two morphologically similar varieties. We revise the taxonomy of C. lucorum, and map the distribution of the taxa. Based on multivariate analyses and analyses of variance of measured characters, allopatry, and previous studies revealing differences in achene micromorphology, chromosome differences, and fl...

ABSTRACT A vascular plant reconnaissance was conducted at the Berea College Forest (BCF) during 2010–2013. A previous vascular plant report of the BCF, a 3,380 ha managed forest in portions of Madison, Jackson, and Rockcastle counties in east-central Kentucky, documented 1,017 specific and infraspecific taxa, 513 genera, and 139 families. An additi...

Stipulicida is a narrowly endemic, monotypic genus as currently circumscribed. Previous studies have attempted to diagnose additional taxa within the genus, but only one species comprised of two varieties is currently accepted. These two varieties, Stipulicida setacea var. setacea and S. setacea var. lacerata, demonstrate significant phenotypic div...

An inventory of the vascular plant species of Alleghany County, North Carolina was conducted from spring 2008-summer 2012. Extensive fieldwork was augmented by a search of numerous herbaria, resulting in the documentation of 1508 taxa (1457 species) in 642 genera and 161 families. These taxa are represented by nine Lycopodiophyta, 39 Monilophyta, 2...

A new species of Marshallia (Asteraceae, Helenieae, Marshalliinae) is proposed and contrasted with the morphologically most similar and putatively most closely related species, M. grandiflora and M. obovata. The new species is known from a few sites in the Piedmont of north-central North Carolina and south-central Virginia, occurring solely or prim...

A descriptive floristic study was conducted during the growing seasons of 2010-2011 and spring 2012 at Dead Horse Knob (Rucker's Knob), an isolated 2.6 ha steep eroded hill with a 312 m conical summit in southern Madison County, Berea, Kentucky. This Dead Horse Knob survey is the first comprehensive flora of a solitary knob in the Knobs Region of e...

Mile-a-minute weed (MAM), Persicaria perfoliata (L.) H. Gross (Polygonaceae), is an annual vine from Asia that has invaded the eastern US where it can form dense monocultures and outcompete other vegetation in a variety of habitats. P. perfoliata was discovered in several disturbed habitats in Alleghany County, North Carolina in 2010. The Asian wee...

A new hedge-nettle species (Stachys: Lamiaceae) is described from the Southern Section of the Blue Ridge Physiographic Province of the Southern Appalachian Mountains. Stachys appalachiana is a narrow endemic known from northwest North Carolina and southwest Virginia. A key for separating morphologically and geographically related taxa is provided,...

Crataegus chrysocarpa var. dodgei (Rosaceae) is reported for the first time from North Carolina. This hawthorn is an enigmatic variety that has alternatively been given specific status (C. dodgei). A brief statement of the taxonomic interpretation and biogeographic significance of this taxon is provided.

Galax urceolata (Diapensiaceae) is a common evergreen herb of southern Appalachian forests. During the fall and winter, leaves of plants in high light produce substantial amounts of anthocyanins. Oddly, rhizomes in these plants also accumulate anthocyanins. The purpose of this observational study was to identify seasonal trends in anthocyanin produ...

Puccinellia rupestris, British alkali grass or stiff saltmarsh grass, is a European halophyte that has only been documented in North America between 1867 and 1880 from coastal zones of New Jersey, New York, and Pennsylvania. We documented Puccinellia rupestris from southern Ohio along an annually salted roadside habitat in 2007. Our collection repr...

Thirty exotic taxa are reported from northwestern North Carolina. These taxa are either new additions to the vascular flora of the state, provide voucher substantiation for reports in Weakley (2011), or supply additional occurrence records for taxa rarely attributed to North Carolina. Floristic research continues to provide updated records and fill...

Background/Question/Methods Galax urceolata (Poir.) Brummitt (Diapensiaceae) is a common evergreen herb of southern Appalachian forests. During fall and winter, leaves of plants exposed to high light produce substantial amounts of anthocyanins, which attenuate excess blue-green light and prevent photoinhibition and photo-oxidative damage to the sp...

Persicaria perfoliata is documented as established for the first time in North Carolina. This taxon is a state-listed Class A noxious weed that has very aggressive naturalizing tendencies. At least three distinct populations have been discovered in north central Alleghany County. Plants in all localities are fruiting rampantly and spreading to adja...

A qualitative floristic survey of Wallace Woods, Linesville, Pennsylvania, was conducted during the growing seasons of 2005–2007. The 12.9 ha tract is situated in the western portion of Crawford County, within the Northwestern Glaciated Plateau Section of the Appalachian Plateaus Province. Wallace Woods has been the property of the Pymatuning Labor...

A clarification of the distribution and identity of Mentha suavcolens and Mentha xrotundifolia is presented. Naturalized populations of M. xrotundifoha are reported from North Carolina for the first time. Previous reports of M. xrotundifolia were based on misapplication of the non-hybrid name M. rotundifolia to M. suaveokns. Mentha xrotundifolia is...

A qualitative floristic survey of Wallace Woods, Linesville, Pennsylvania, was conducted during the growing seasons of 2005–2007. The 12.9 ha tract is situated in the western portion of Crawford County, within the Northwestern Glaciated Plateau Section of the Appalachian Plateaus Province. Wallace Woods has been the property of the Pymatuning Labor...

A qualitative inventory of the vascular plant species of Mount Jefferson State Natural Area and contiguous areas was conducted from fall 2004-summer 2008. The 368 ha site is the most southeastern peak within the Amphibolite Mountains Macrosite of northwestern North Carolina. The study area is near equidistant from the towns of Jefferson and West Je...

Two taxa previously undocumented for the vascular flora of North Carolina are here reported. Both state records are from mountainous counties located in extreme northwestern North Carolina, in the Blue Ridge Physiographic Province of the Southern Appalachians Silene flos-cuculi ssp flos-cuculi is a European exotic that primarily occurs in the north...

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