selected scholarly activity
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chapters
- Gentianaceae. 453-503. 2018
- Morphological Characteristics of the Family Gentianaceae. 1-12. 2014
- Morphological characteristics of the family gentianaceae. 1-12. 2014
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journal articles
- Nomenclatural notes on South American Gentianella (Gentianaceae, Gentianeae, Swertiinae): G. meyeniana. Ukrainian Botanical Journal. 81:3-7. 2024
- Nomenclatural notes on South American Gentianella (Swertiinae, Gentianeae, Gentianaceae): Gentianella calanchoides, G. ernestii, and G. rima. Ukrainian Botanical Journal. 80:117-127. 2023
- (2936–2937) Proposals to reject the names Gentiana poculifera (Gentianella poculifera) and Ulostoma filamentosum (Gentianaceae). Taxon. 72:213-214. 2023
- Phylogenetics Support the Description of a New Sichuanese Species, Susanne’s Gentian, Gentiana susanneae (Gentianaceae). Systematic Botany. 47:506-513. 2022
- Travel Tales of a Worldwide Weed: Genomic Signatures of Plantago major L. Reveal Distinct Genotypic Groups With Links to Colonial Trade Routes. Frontiers in Plant Science. 13:838166. 2022
- (2825) Proposal to reject the name Glyphospermum ornatum (Gentianaceae: Gentianeae: Swertiinae). Taxon. 70:899-900. 2021
- Phylogenetic relationships and sectional delineation within Gentiana (Gentianaceae). Taxon. 69:1221-1238. 2020
- A Taxonomic Reassessment and a New Synonymy in Peruvian Gentianella (Gentianaceae, Gentianeae, Swertiinae). Novon. 28:40-45. 2020
- Gentianella montesinosii (Gentianaceae, Gentianeae, Swertiinae), a New Species from Peru. Novon. 27:248-252. 2019
- (2678) Proposal to reject the name Cicendia stricta (Gentianaceae: Chironeae: Chironiinae). Taxon. 68:404-405. 2019
- The Identification, Nomenclature, and Naturalized Distribution of Mazus miquelii (Mazaceae) in North America. Castanea. 83:216-223. 2018
- <em>Gentianella canoi</em> S.J.Castillo & J.S.Pringle sp. nov. (<em>Gentianaceae</em>), a new species from Peru. Anales del Jardin Botanico de Madrid. 75:068-068. 2018
- Four New Species ofGentianella(Gentianaceae, Gentianeae, Swertiinae) from Peru, with a Review of the Taxonomy of the Genus. Novon. 25:451-466. 2017
- Out‐of‐Tibet: the spatio‐temporal evolution of Gentiana (Gentianaceae). Journal of Biogeography. 43:1967-1978. 2016
- Erratum. Novon. 24:435-435. 2016
- New South American Species ofGentianaandGentianella(Gentianaceae). Novon. 24:389-398. 2016
- Gentianella zaratei(Gentianaceae), a New Species from Bolivia. Novon. 24:182-185. 2015
- Infraspecific variation in gentiana macrauchena (Gentianaceae), the extension of its known range to india and lectotypification of the name gentiana incompta. Taiwania. 60:208-217. 2015
- New Species and Nomenclatural Transfers in South AmericanGentianella(Gentianaceae). Annales Botanici Fennici. 51:117-124. 2014
- Nomenclatural Notes on North AmericanGyrandra(Centaurium s. lat.) andLomatogonium(Gentianaceae). Rhodora. 115:96-111. 2013
- Two Taxonomic Innovations in South AmericanGentianella(Gentianaceae). Novon. 22:217-219. 2012
- Two new species of Gentianella (Gentianaceae) from Peru. Brittonia. 64:282-288. 2012
- Gentianella weigendii(Gentianaceae), an Unusual New Gentian from Peru. Novon. 22:70-74. 2012
- Validation of the Name Zeltnera texensis (Gentianaceae). Rhodora. 113:514-515. 2011
- Five New Species of South AmericanGentianella(Gentianaceae). Novon. 21:78-89. 2011
- Gentiana latidens (Gentianaceae), the Balsam Mountain Gentian. Rhodora. 111:389-397. 2009
- Four New Species of Peruvian Gentianella (Gentianaceae). Novon. 18:511-516. 2008
- (1806) Proposal to reject the name Swertia recurva (Halenia recurva) (Gentianaceae). Taxon. 57:307-308. 2008
- Peru. Madrono. 55:91-92. 2008
- Type localities of vascular plants first described from Ohio: Supplement. Journal of the Botanical Research Institute of Texas. 22:765-767. 2006
- A new species of Sabatia (Gentianaceae) from Saline County, Arkansas. Journal of the Botanical Research Institute of Texas. 21:1249-1262. 2005
- Nomenclature of the Virginia-bluebell, Mertensia virginica (Boraginaceae). Journal of the Botanical Research Institute of Texas. 21:771-775. 2004
- Notes on the distribution and nomenclature of North American Gentianopsis (Gentianaceae). Journal of the Botanical Research Institute of Texas. 21:524-530. 2004
- Lectotypification of the name Gentiana quinquefolia var. Occidentalis (Gentianaceae). Rhodora. 106:368-370. 2004
- History and eponymy of the genus name Amsonia (Apocynaceae). Journal of the Botanical Research Institute of Texas. 21:379-387. 2004
- Two new combinations in Bolivian Gentianella (Gentianaceae). Journal of the Botanical Research Institute of Texas. 20:1485-1490. 2003
- Type localities of vascular plants first described from Ohio. Journal of the Botanical Research Institute of Texas. 20:1677-1692. 2003
- Nomenclature of the heart-leaved hedge-nettle, Stachys cordata (Lamiaceae). Journal of the Botanical Research Institute of Texas. 20:583-584. 2002
- Macrocarpaea angustifolia (Gentianaceae), a New Species from Peru. Novon. 12:80-80. 2002
- Erratum: (Canadian Field-Naturalist (1995) 109 (291-356)). Canadian Field-Naturalist. 110:354. 1996
- The history of the exploration of the vascular flora of Canada. Canadian Field-Naturalist. 109:291-356. 1995
- The history of the exploration of the vascular flora of Greenland. Canadian Field-Naturalist. 109:362-377. 1995
- The history of the exploration of the vascular flora of Saint-Pierre et Miquelon. Canadian Field-Naturalist. 109:357-361. 1995
- Assessment of random amplified polymorphic DNA (RAPD) as genetic markers for determining the origin of interspecific lilac hybrids. Taxon. 42:531-537. 1993
- W. A. WEISER. The field naturalist. John Macoun, the Geological Survey and natural science. University of Toronto Press, Toronto: 1989. Pp x, [24 illust.], 253; illustrated. Price: £21, Can$34. ISBN 0-8020-2686-9.. Archives of Natural History. 17:389-390. 1990
- LANDMARKS OF BOTANICAL HISTORY - GREENE,EL. Studies in the History of Gardens and Designed Landscapes. 6:179-180. 1986
- GENTIANA-LINEARIS (GENTIANACEAE) IN SOUTHERN APPALACHIANS. Castanea. 42:1-8. 1977
- Book reviews. Economic Botany. 30:97-102. 1976
- Abstracts of Papers to be Presented at the Joint Sessions of the American Society of Plant Taxonomists and the Systematics Section of the Botanical Society of America at the American Institute of Biological Sciences Meetings, University of Minnesota, Minneapolis, 27 August-1 September 1972. Brittonia. 24:117-117. 1972
- Taxonomy and Distribution of Clematis, Sect. Atragene (Ranunculaceae), in North America. Brittonia. 23:361-361. 1971
- Taxonomy of Gentiana, Section Pneumonanthae, in Eastern North America. Brittonia. 19:1-1. 1967