海量图书期刊资源,随时随地畅享阅读乐趣
Evidence for the Recognition of Viola appalachiensisHarvey E. Ballard, Jr. and Daniel E. Wujek · Systematic Botany · 1994
Three New Rostrate Violet Hybrids from AppalachiaHarvey E. Ballard, Jr. · Castanea · 1993
A New Name for an Endemic Ecuadorian VioletHarvey E. Ballard, Jr. and Peter M. Jørgensen · Novon · 1997
Typifications and nomenclatural notes in Passiflora section Dysosmia (Passifloraceae)SVOBODA, HARLAN T.; MACDOUGAL, JOHN M.; BALLARD, JR., HARVEY E. · Phytotaxa · 2016
A New Zygomorphic-Flowered Rinorea (Violaceae) from the NeotropicsGregory A. Wahlert and Harvey E. Ballard Jr. · Novon · 2009
CLIFF CUDWEED AT SPECIFIC RANK IN PSEUDOGNAPHALIUM (ASTERACEAE: GNAPHALIEAE)Harvey E. Ballard, Jr., Danielle Sky Feller and Guy L. Nesom · SIDA, Contributions to Botany · 2004
A Taxonomic Revision of Collinsonia (Lamiaceae) Based on Phenetic Analyses of Morphological VariationJess A. Peirson, Philip D. Cantino and Harvey E. Ballard, Jr. · Systematic Botany · 2006
Ferns, Lichens, and Hummingbirds' NestsRamón Riba and Teófilo Herrera · American Fern Journal · 1973
A New Selaginella from Southwestern UtahSeville Flowers · American Fern Journal · 1949
Ferns of Barro Colorado Island: IIPaul C. Standley · American Fern Journal · 1927
ErrataAmerican Fern Journal · 1976
The Taxonomic Status of Selanginella eatoniiWilliam R. Buck · American Fern Journal · 1978
Leaf Epidermal Studies in MarsileaJohn T. Mickel and Frank V. Votava · American Fern Journal · 1971
Nomenclatural Corrections in AdiantumPrado, Jefferson · American Fern Journal · 2004
Early Lycophyte EvolutionGensel, Patricia G.; Berry, Christopher M. · American Fern Journal · 2001