natural areas inventory - Niagara Peninsula Conservation Authority

Checklist of the Vascular Plants of Niagara Regional Municipality, Ontario(M.J. Oldham March 2010)SCIENTIFIC NAME COMMON NAME NIAG NIAGARA NOTES HAMI HANO COSEWIC MNR SRANK FAMILYAsarum canadense L. Wild-ginger CRare on the Haldimand Clay Plain,frequent only along escarpment woods orsandy ravines and valley slopes.Uncommon-common along the NiagaraEscarpment and steep valley slopes of C C S5 ARISTOLOCHIACEAEthe Fonthill Delta Kame. On the clayplain, it is almost restricted to theOnondaga Escarpment and associatedbedrock plains.Asclepias exaltata L. Poke Milkweed RRare in open, often sandy woods.Very localized, and often only a fewplants are found at each locality.Reported from four NiagaraEscarpment sites by Riley et al. (1996).C C S4 APOCYNACEAEG.H. Hamilton (NFO, det. M.J.Oldham in 2007) from Niagara Glenin 1943.Asclepias incarnata L. ssp.incarnataSwamp Milkweed C Common in open wet areas. C C S5 APOCYNACEAEAsclepias quadrifolia Jacq.Four-leavedMilkweedAsclepias syriaca L. Common Milkweed CAsclepias tuberosa L. Butterfly-weed RRHAsclepias verticillata L. Whorled Milkweed RHKnown historically from several sitesalong the Niagara River (CAN, DAO,MICH, TRT) though no records since1956. Formerly "very abundant in theopen woods opposite the [Niagara]Glen" (Hamilton 1943). Thought to beextirpated in Canada untilrediscovered in southeastern Ontarioin 2006.Common in more or less open disturbedareas.Rare in open, dry sandy areas. Mostrecords are in the Niagara Falls area.M.J. Oldham #32892 (DAO) fromNiagara Glen in 2006.Known from Niagara Falls and theWhirlpool since the late 1800s(Zenkert 1934) and seen there asrecently as 1976 (A.A. Reznicek,TRTE). Not relocated during surveysin 1989 (Varga and Kor 1993) or 2006(Oldham 2007).-- -- S1 APOCYNACEAEC C S5 APOCYNACEAEU6 C S4 APOCYNACEAE-- R1 S4 APOCYNACEAENatural Heritage Areas Inventory, 2010 9-54