Steve Orzell - Academia.edu (original) (raw)
I study the native flora and plant communities of Florida and the southeastern United States. My current research is primarily on fire-climate-vegetation relationships in subtropical and tropical savannas and grasslands. Secondly my research has focused on documenting and describing the unknown biodiversity of peninsular Florida (plants new to science and undocumented plant communities) and Florida biogeography.
I particularly welcome collaboration with other researchers on phylogeny studies that include Florida plants.
"Science commits suicide when it adopts a creed" T. H. Huxley (1885)
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Papers by Steve Orzell
Journal of the Arkansas Academy of Science, 1985
Journal of the Botanical Research Institute of Texas, 2019
Examination of the lectotype and isotype material of Physalis macrophysa Rydb. show its compatibi... more Examination of the lectotype and isotype material of Physalis macrophysa Rydb. show its compatibility with P. longifolia, having nearly glabrous, ovate-lanceolate to broadly lanceolate leaves, and the presence of short, simple antrorse hairs on the petioles and pedicels. Other than its large inflated fruiting calyces (3.0–4.0 cm × 2.5–3.0 cm), it has little in common morphologically with another large inflated calyced Physalis macrosperma which is endemic to deep sands from a portion of the West Gulf Coastal Plain of the United States. Instead, P. longifolia has stems and pedicles that are either nearly glabrous or with antrorse, appressed, non-glandular hair and ovate-lanceolate leaves versus short glandular and non-glandular, spreading, upright hair and cordate to truncate leaves in the aforementioned Physalis macrosperma. We agree with previous authors that P. macrophysa Rydb., if meriting taxonomic status, should be treated as P. longifolia var. subglabrata (Mack. & Bush) Cronqu...
SIDA, contributions to botany., 1989
SIDA, contributions to botany., 2002
Journal of the Botanical Research Institute of Texas, 2019
A new species of Physalinae (Solanaceae) is described and illustrated that is endemic to the West... more A new species of Physalinae (Solanaceae) is described and illustrated that is endemic to the West Gulf Coastal Plain of the southeastern United States, a global biodiversity hotspot. Physalis macrosperma sp. nov. is distinguished by its large obpyramidal fruiting calyx (35–70 mm in length), its large seeds [3.2–4.2(4.8) mm in length and 2.5–3.5(3.9) mm in width], and its coarsely pitted seed testa. The ecological and geographical setting of P. macrosperma and its morphological relationships with similar taxa are presented. Physalis macrosperma is an herbaceous perennial psammophyte inhabiting open sand barrens within pyrogenic savanna-woodlands of xeric sandhills. It occurs on droughty undulating Eocene-age quartzipsamments within south-central and east-central Texas and on younger xeric sands embedded within the fire-maintained pinelands of southwestern Arkansas, western Louisiana, and southeastern Texas.
See next page for additional authors
Fire seasonality, an important characteristic of fire regimes, commonly is delineated using seaso... more Fire seasonality, an important characteristic of fire regimes, commonly is delineated using seasons based on single weather variables (rainfall or temperature). We used nonparamet-ric cluster analyses of a 17-year (1993–2009) data set of weather variables that influence likelihoods and spread of fires (relative humidity, air temperature, solar radiation, wind speed, soil moisture) to explore seasonality of fire in pine savanna-grassland landscapes at the Avon Park Air Force Range in southern Florida. A four-variable, three-season model ex-plained more variation within fire weather variables than models with more seasons. The three-season model also delineated intra-annual timing of fire more accurately than a con-ventional rainfall-based two-season model. Two seasons coincided roughly with dry and wet seasons based on rainfall. The third season, which we labeled the fire season, occurred between dry and wet seasons and was characterized by fire-promoting conditions present annually:...
Journal of the Arkansas Academy of Science, 1985
Journal of the Botanical Research Institute of Texas, 2019
Examination of the lectotype and isotype material of Physalis macrophysa Rydb. show its compatibi... more Examination of the lectotype and isotype material of Physalis macrophysa Rydb. show its compatibility with P. longifolia, having nearly glabrous, ovate-lanceolate to broadly lanceolate leaves, and the presence of short, simple antrorse hairs on the petioles and pedicels. Other than its large inflated fruiting calyces (3.0–4.0 cm × 2.5–3.0 cm), it has little in common morphologically with another large inflated calyced Physalis macrosperma which is endemic to deep sands from a portion of the West Gulf Coastal Plain of the United States. Instead, P. longifolia has stems and pedicles that are either nearly glabrous or with antrorse, appressed, non-glandular hair and ovate-lanceolate leaves versus short glandular and non-glandular, spreading, upright hair and cordate to truncate leaves in the aforementioned Physalis macrosperma. We agree with previous authors that P. macrophysa Rydb., if meriting taxonomic status, should be treated as P. longifolia var. subglabrata (Mack. & Bush) Cronqu...
SIDA, contributions to botany., 1989
SIDA, contributions to botany., 2002
Journal of the Botanical Research Institute of Texas, 2019
A new species of Physalinae (Solanaceae) is described and illustrated that is endemic to the West... more A new species of Physalinae (Solanaceae) is described and illustrated that is endemic to the West Gulf Coastal Plain of the southeastern United States, a global biodiversity hotspot. Physalis macrosperma sp. nov. is distinguished by its large obpyramidal fruiting calyx (35–70 mm in length), its large seeds [3.2–4.2(4.8) mm in length and 2.5–3.5(3.9) mm in width], and its coarsely pitted seed testa. The ecological and geographical setting of P. macrosperma and its morphological relationships with similar taxa are presented. Physalis macrosperma is an herbaceous perennial psammophyte inhabiting open sand barrens within pyrogenic savanna-woodlands of xeric sandhills. It occurs on droughty undulating Eocene-age quartzipsamments within south-central and east-central Texas and on younger xeric sands embedded within the fire-maintained pinelands of southwestern Arkansas, western Louisiana, and southeastern Texas.
See next page for additional authors
Fire seasonality, an important characteristic of fire regimes, commonly is delineated using seaso... more Fire seasonality, an important characteristic of fire regimes, commonly is delineated using seasons based on single weather variables (rainfall or temperature). We used nonparamet-ric cluster analyses of a 17-year (1993–2009) data set of weather variables that influence likelihoods and spread of fires (relative humidity, air temperature, solar radiation, wind speed, soil moisture) to explore seasonality of fire in pine savanna-grassland landscapes at the Avon Park Air Force Range in southern Florida. A four-variable, three-season model ex-plained more variation within fire weather variables than models with more seasons. The three-season model also delineated intra-annual timing of fire more accurately than a con-ventional rainfall-based two-season model. Two seasons coincided roughly with dry and wet seasons based on rainfall. The third season, which we labeled the fire season, occurred between dry and wet seasons and was characterized by fire-promoting conditions present annually:...