Earlier plant flowering in spring as a response to global warming in the Washington, DC, area MS Abu-Asab, PM Peterson, SG Shetler, SS Orli Biodiversity & Conservation 10, 597-612, 2001 | 402 | 2001 |
A provisional checklist of species for Flora North America (revised). SG Shetler, LE Skog | 78 | 1978 |
Seed morphology in North American Campanulaceae SG Shetler, NR Morin Annals of the Missouri Botanical Garden, 653-688, 1986 | 65 | 1986 |
POLLEN‐COLLECTING HAIRS OF CAMPANULA (CAMPANULACEAE), I: HISTORICAL REVIEW SG Shetler Taxon 28 (1-3), 205-215, 1979 | 65 | 1979 |
The herbarium: past, present, and future SG Shetler Papers Presented at a Symposium on Natural History Collections: Past-Present …, 1969 | 43 | 1969 |
Demythologizing biological data banking SG Shetler Taxon 23 (1), 71-100, 1974 | 37 | 1974 |
The Komarov Botanical Institute; 250 years of Russian research SG Shetler | 33 | 1967 |
VARIATION AND EVOLUTION OF THE NEARCTIC HAREBELLS (CAMPANULA SUBSECT. HETEROPHYLLA).(VOLUMES I AND II) SG Shetler | 27 | 1980 |
Checklist of the vascular plants of Plummers Island, Maryland SG Shetler, SS Orli, EF Wells, M Beyersdorfer Bulletin of the Biological Society of Washington 14 (1), 1-57, 2006 | 21 | 2006 |
Flora North America as an information system SG Shetler BioScience 21 (11), 524-532, 1971 | 21* | 1971 |
First flowering dates for spring-blooming plants of the Washington, DC, area for the years 1970 to 1983 SG Shetler, SK Wiser Proceedings of the Biological Society of Washington 100 (4), 993-1017, 1987 | 18 | 1987 |
A checklist and key to the species of Campanula native or commonly naturalized in North America SG Shetler Rhodora 65 (764), 319-337, 1963 | 17 | 1963 |
Annotated Checklist of the Vascular Plants of the Washington-Baltimore Area Part I Ferns, Fern Allies, Gymnosperms, and Dicotyledons SG Shetler, SS Orli Smithsonian Institution, Washington, DC, 2000 | 16 | 2000 |
An introduction to the botanical type specimen register SG Shetler Smithsonian contributions to botany, 1973 | 16 | 1973 |
Exine structure of pantoporate Campanula (Campanulaceae) species JW Nowicke, SG Shetler, N Morin Annals of the Missouri Botanical Garden, 65-80, 1992 | 15 | 1992 |
Pilot data processing systems for floristic information SG Shetler, JH Beaman, ME Hale, LE Morse, JJ Crockett, RA Creighton Data processing in Biology and Geology 1971, 1971 | 14 | 1971 |
A computer system for editing diagnostic keys for Flora North America LE Morse, JH Beaman, SG Shetler Taxon 17 (5), 479-483, 1968 | 13 | 1968 |
Annotated Checklist of the Vascular Plants of the Washington-Baltimore Area: Monocotyledons SG Shetler, SS Orli Smithsonian Institution, 2002 | 11 | 2002 |
Proposals for the simplification of infraspecific terminology PH Raven, SG Shetler, RL Taylor Taxon 23, 828-831, 1974 | 11 | 1974 |
Plants in the arctic-alpine environment SG Shetler, Smithsonian Institution (Washington DC) Smithsonian Institution, 1964 | 11 | 1964 |