Southern Ontario Vascular Plant Species List

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SRank Black Maple Acer saccharum ssp. nigrum ACERSAN Sugar Maple Acer saccharum ssp. saccharum ACERSAS Northern Lady Fern Athyrium filix-femina var. angustum ATHYFIA Plantain-leaved Sedge Carex plantaginea CAREPLA Broad-leaved Wood Sedge Carex platyphylla CAREPLT Slender Wood Sedge Carex gracilescens CAREGRA Graceful Sedge Carex gracillima CAREGRM The Natural Heritage Information Centre uses a ranking system that considers the provincial rank of an element as a tool to prioritize protection efforts. The provincial (Sub-national) rank is known as the SRANK. These ranks have been assigned using the best available scientific information, and follow a systematic ranking procedure developed by The Nature Conservancy (U.S.). The ranks are based on three factors: estimated number of occurrences, estimated community extent, and estimated range of the community within the province. The provincial ranks are summarized below. S1 - Extremely rare in Ontario; usually 5 or fewer occurrences in the province, or very few remaining hectares S2 - Very rare in Ontario; usually between 6 and 20 occurrences in the province, or few remaining hectares S3 - Rare to uncommon in Ontario; usually between 21 and 80 occurrences in the province; may have fewer occurrences, but with some extensive examples remaining S4 - Considered to be common in Ontario. It denotes that a species is apparently secure, with over 80 occurrences in the province S5 - Indicates that a species is widespread in Ontario, it is demonstrably secure in the province These provincial ranks may further be modified. S2S3 - Indicates that an element is rare, but insufficient information exists to accurately assign a single rank SE - Indicates exotic introductions to the flora SH - Indicates that an element is known historically for the province, but it hasn't been verified in the past 20 years. It is not known conclusively to be extirpated in Ontario SHB - Indicates that the species is of a hybrid origin SX - Indicates that an element is extirpated from the province SU - Indicates that the status is uncertain due to insufficient information SRF - Is a species that was recorded falsely for the province iii
With the publication of the new Rare Vascular Plant List for Ontario (Oldham, M. and S. Brinker, 2009) many of the provincial S rankings have also been updated in this version of the list. Species such as Pin Oak is now known to be more common in Ontario and has a S4 ranking. Some species however are in decline due to fungal diseases. Included in this category are Butternut (Juglans cinerea), which was ranked as S4 and is now ranked S3, and American Chestnut (Castanea dentata) which has gone from an S3 to a S2 ranking. Form Code This column describes the general growth form of a plant species. Is it a forb, shrub or tree? Non vascular plants such as moss, liverwort, hornwort, algae and lichen have general placeholder codes which have been included in this listing. In the case of some rock barrens, moss and lichen species can be the dominate plant forms, so it is necessary to record a percent cover for these larger plant groups. If your organization has someone who has expertise with these non vascular plants or lichens, then by all means identify them down to the genus or species level when possible. Generally, only one estimated % cover value is recorded for all of the Lichen species combined together. The following is a listing of the abbreviations used in the table along with a brief explanation of what each represents. AL Algae colonial filamentous algal species found in aquatic habitats FE Fern non-flowering, vascular plant, reproducing by spores (includes the fern allies) FO Forb herbaceous broad-leaved plant GR Grass graminoid plants that have stems with nodes (Poaceae) HR Hornwort members of the Anthocerotophyta division of plants LC Lichen crustose, foliose and fruticose lichen species LV Liverwort members of the Hepaticophyta division of plants MO Moss members of the Bryophyta division of plants RU Rush graminoid plants with round stems (Juncaceae) SE Sedge graminoid plants with angular stems (Cyperaceae) SH Shrub plants with erect, reclining or prostrate woody stems (usually with more than one stem) TR Tree woody perennial plant having a single (1- 3), usually with an elongate main stem more than 10 m high VI Vine herbaceous plant that trail, cling, or twine, and require support to grow vertically VW Woody Vine a vine with a perennial woody stem iv
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Southern Ontario Vascular Plant Species List

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