US National Arboretum

 


Floral and Nursery Plants Research Unit

Dr. Joseph H. Kirkbride, Jr.

Research Botanist
{Washington, DC}

Joseph.Kirkbride@ars.usda.gov

PROJECT PLAN TITLE:  
Taxonomy and Genetic Diversity Assessment of Landscape Trees and Shrubs

INTRODUCTION:  
The primary goals for this project are to assess systematic relationships and the amount and apportionment of genetic diversity within and between species. The work focuses on the genus Catalpa and the temperate taxa of Chionanthus, determining the species delimitations and their correct scientific names and developing genetic marker systems that will facilitate this work and at the same time be useful for breeding and selection work in these genera. The project also manages and develops the U.S. National Seed Herbarium, the largest, most comprehensive collection of fruit and seed samples in the world, focused on agriculturally important plants; collaborates in the documentation of emerging invasive woody plants, and the investigation of traits contributing to their invasiveness; and works to determine the valid botanical and cultivar names for landscape trees and shrubs, and to ensure that those names are properly and consistently applied.

PROGRESS:  
Discovered that a widely used name for a Chinese Catalpa species, C. tibetica, was actually a North American species that had long been cultivated in China. The number of native Chinese Catalpa species was reduced from four to three, and the number of accepted Catalpa species was reduced from 10 to nine. Correctly identified the North American Catalpa species and clarified the typical specimens that anchor their names. Developed a library of molecular markers for Chionanthus retusus, the Chinese fringetree, consisting of 195 Simple Sequence Repeat (SSR) markers from 384 primers. These markers were then used to determine that there are six genetic clusters of C. retusus cultivated in North America of which of only two are widely available in the nursery trade, leaving four groups underutilized and suitable for development of new cultivars of the Chinese fringetree.

PLANS:   
To elucidate the genetic structure of Chionanthus virginicus across its entire North American range using molecular markers, and investigate the circumscriptions and relationships of C. pygmaeus, endemic to central Florida, and C. virginicus using molecular markers. Continue to participate in important collaborative taxonomic projects in North and South America.

RECENT PUBLICATIONS:

2003. J. H. Kirkbride, Jr. (1574) Proposal to conserve the name Chloroleucon against Chloroleucum (Fabaceae). Taxon 52:141142

2003. J. H. Kirkbride, Jr., C. R. Gunn, A. L. Weitzman, and M. J. Dallwitz. Legume (Fabaceae) Fruits and Seeds, version 2.0. Beltsville, Maryland: USDA, ARS, Systematic Botany & Mycology Laboratory, URL: http://nt.ars-grin.gov/SBMLWeb/OnlineResources/Fabaceae/.

2003. E. E. Terrell, J. L. Reveal, R. W. Spjut, R. F. Whitcomb, J. H. Kirkbride, Jr., M. T. Cimino, M. T. Strong, and D. F. Farr.Flora of the Henry Agaard Wallace Beltsville Agricultural Research Center, ver. 1.1. Beltsville, Maryland: USDA, ARS, Systematic Botany & Mycology Laboratory, URL: http://nt.ars-grin.gov/barcflora/.

2003. J. H. Kirkbride, Jr., C. R. Gunn, and A. L. Weitzman.Fruits and seeds of genera in the subfamily Faboideae (Fabaceae). U.S. Department Agriculture Technical Bulletin number 1890, 1,212 pp.

2004. J. H. Kirkbride, Jr., C. R. Gunn, and M. J. Dallwitz. Worldwide identification of legume (Fabaceae) seeds using expert computer technology. Seed Science and Technology 32: 53–68.

2004. J. H. Kirkbride, Jr., C. R. Gunn, and M. J. Dallwitz.Interactive identification to genus of legume (Fabaceae) fruits and seeds via the Internet. Acta Horticulturae (ISHS) 631: 55–61. http://www.actahort.org/books/631/631_6.htm

2004. T. S. Filgueiras, G. Davidse, J. H. Kirkbride, Jr., F. Chiang, R. Rueda, and F. O. Zuloaga. (182) Nomenclatural suffrage for all registered herbaria. Taxon 53(2): 595.

2005. J. H. Kirkbride, Jr. and J. H. Wiersema. (1681) Proposal to conserve the name Centrosema pubescens (Fabaceae) with a conserved type. Taxon 54(1): 209–210.

2005. J. H. Kirkbride, Jr. Dupuya, a new genus of Malagasy legumes (Fabaceae). Novon 15(2): 305–314.

2006. J. H. Kirkbride, Jr. The scientific name of Narrow-Leaf Trefoil. Crop Science 46: 2169–2170.

2006. X.-Y. Zhu and J. H. Kirkbride, Jr. (1751–1752) Proposals to conserve the name Thermopsis lanceolata and Sophora lupinoides with conserved types (Leguminosae). Taxon 55(4): 1047–1049.

2006. J. H. Kirkbride, Jr., J. H. Wiersema, and N. J. Turland. (1753) Proposal to conserve the name Ziziphus jujube against Z. zizyphus (Rhamnaceae). Taxon 55(4): 1049–1050.

2006. J. H. Kirkbride, Jr., C. R. Gunn and M. J. Dallwitz. Family guide for fruits and seeds. Beltsville, Maryland: USDA, ARS, Systematic Botany & Mycology Laboratory, URL: http://nt.ars-grin.gov/sbmlweb/OnlineResources/frsdfam/.

2007. J. H. Kirkbride, Jr. and J. H. Wiersema. (1758) Proposal to reject the name Arundo vallatoria (Poaceae). Taxon 56(1): 258.

2007. J. H. Kirkbride, Jr. A 19th Century Brazilian botanical dictionary. Taxon 56(3): 927–937.

2007. J. H. Kirkbride, Jr. and J. H. Wiersema. (1785) Proposal to conserve the name Zinnia elegans (Compositae). Taxon 56(3): 958–959.

2007. E. Araujo da Anunciação, C. Bestetti Costa, R. Cortés, P.G. Delprete, J. H. Kirkbride, Jr.. C. Persson, J. A. Steyermark, C. M. Taylor, A. Vincentini, and D. Zappi. Rubiaceae. In: V. Funk,T. Hollowell, P. Berry, C. Kelloff, and S. N. Alexander, eds., Checklist of the plants of the Guiana Shield (Venezuela: Amazonas, Bolivar, Delta Amacuro; Guyana, Surinam, French Guiana). Contributions from the United States National Herbarium 55: 479–507.

2008. P. G. Delprete and J. H. Kirkbride, Jr. Clarification of Borreria gymnocephala, Diodia gymnocephala, Diodia schumannii, Borreria flavovirens, and Spermacoce schumannii (Rubiaceae). Journal of the Botanical Research Institute of Texas 2(1): 305–308.

2008. M. P. Widrlechner, J. H. Kirkbride, Jr., A. G. Ghebretinsae, and K. R. Reitsma.Cucumis zambianus (Cucurbitaceae): A New Species from Northwestern Zambia. Systematic Botany 33(4): 732–738.

2010. M. P. Widrlechner, K. R. Reitsma, L. D. Clark, and J. H. Kirkbride, Jr. Length and rapid elongation of pedicels of the female flowers of Cucumis anguria L. Cucurbit Genetics Cooperative 31/32: 36–40, back cover.

2010. J. H. Kirkbride, Jr. Lotus alianus, a new species from Cabo Verde and nomenclatural notes on Lotus section Pedrosia (Fabaceae). Pakistan Journal of Botany, Special Issue (Prof. Ali’s festschrift), 42(SI): 1–10.

2011. R. A. Arias, N. Techen, T. A. Rinehart, R. T. Olsen, J. H. Kirkbride, Jr., and B. E. Scheffler.Development of simple sequence repeat markers for Chionanthus retusus (Oleaceae) and effective discrimination of closely related taxa. HortScience 46(1): 23–29.

2011. J. H. Kirkbride, Jr. and R. T. Olsen. Neotypification of Catalpa speciosa (Bignoniaceae). Taxon 60(6): 1760–1763.

2011. J. H. Kirkbride, Jr. and X.-Y. Zhu. (2040) Proposal to reject the name Sophora lupinoides (Leguminosae). Taxon 60(6): 1779–1780. (with X.-Y. Zhu)

2011. J. H. Kirkbride, Jr. and R. T. Olsen.Identity of Catalpa tibetica (Bignoniaceae). Journal of the Botanical Research Institute of Texas 5(2): 625–631. (with R.T. Olsen)

2012. L. Meng, X.-Y. Zhu, and J. H. Kirkbride, Jr. (2059) Proposal to conserve the name Glycyrrhiza inflate against G. paucifoliolata (Leguminosae). Taxon 61(2): 471.

2012. J. H. Kirkbride, Jr, J. H. Wiersema, and P. G. Delprete. (2063–2065) Proposals to reject the names Spermacoce strigosa and S. hyssopifolia Sm. And conserve the name S. hyssopifolia Willd. Es oem. & Schult. (Rubiaceae). Taxon 61(2): 475–476.

2012. J. H. Kirkbride, Jr., J.H. Wiersema and P.G. Delprete.(1) Request for a binding decision on whether Ferdinanda (Compositae) and Ferdinanadea (Rubiaceae) are sufficiently alike to be confused. Taxon 61(2): 479.

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