. Atlas of the rare vascular plants of Ontario. Rare plants; Botany. ^ ^ y"// After/Oapres: Clewell 1985. S Correll&Correll 1975. Crawford , M 1970. Fasson 1941. Gould 1962. Rodgers 1950. Sloyormark 1963. Stone 1973. Vo68 1985. Wherry «fa/. 1979 r} '-'-^^^. HABITAT: Moist, sandy-clay prairies; rich, wet- mesic, hardwood forests; sandy, swannpy woodlands, thickets, and meadows; open, sandy fields; and occasionally along railway tracks. STATUS: Rare in Canada. Rare in New York. NOTES: At a glance, Oxypolis rigidior looks like many other white-flowered umbellifers and it is sometimes co
. Atlas of the rare vascular plants of Ontario. Rare plants; Botany. ^ ^ y"// After/Oapres: Clewell 1985. S Correll&Correll 1975. Crawford , M 1970. Fasson 1941. Gould 1962. Rodgers 1950. Sloyormark 1963. Stone 1973. Vo68 1985. Wherry «fa/. 1979 r} '-'-^^^. HABITAT: Moist, sandy-clay prairies; rich, wet- mesic, hardwood forests; sandy, swannpy woodlands, thickets, and meadows; open, sandy fields; and occasionally along railway tracks. STATUS: Rare in Canada. Rare in New York. NOTES: At a glance, Oxypolis rigidior looks like many other white-flowered umbellifers and it is sometimes confused with Sium suave Walt. Plants of O. rigidior have once-pinnate leaves with 5-13 leaflets that are entire, or with a few, coarse, irregularly spaced teeth towards the tips. The leaflets of S. suave, however, have numerous, fine, regularly spaced teeth along the margins. Mature fruits of the two species are easily distinguished: O. rigidior has fruits 4-7 mm long, flattened in cross- section, with 5 dorsal ribs over the seed body, and with prominent lateral wings; whereas, those of S. suave are 2-3 mm long, almost round in cross- section, with prominent ribs, and lack wings. The leaves and tuberous roots of O. rigidior are reputedly poisonous if eaten, and cases of dermatitis have been reported after handling the plants. The species is widespread and locally quite common in Essex County (Oldham, pers. comm.). A report of O. rigidior from Port Colborne in the Regional Municipality of Niagara (Macoun 1883, Soper 1962) was not substantiated. HABITAT: Prairies sablonneuses et argileuses humides; riches forêts de feuillus humides à mésiques; boisés, fourrés et prés sablonneux et marécageux; champs sablonneux découverts; et, à l'occasion, le long des voies ferrées. SITUATION: Rare au Canada. Rare dans l'Ãtat de New York. REMARQUES: à première vue, Oxypolis rigidior ressemble à bien d'autres ombellifères à fleurs blanches, et on le confond que
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectbotany
