. The Canadian field-naturalist. Moore: The Dog-Strangling Vine 145. ^- ^.. 1 .: ^. , .. 2 Herbarium specimens of (Figure 1) Cynanchum medium Ottawa, Ontario, and (Figure 2)^Cynanchum nigrmti (L.) Pers. Peoria County, Illinois. Robert Brown (1809) described C. medium from a plant cultivated in the Paris Botanic Garden. This species seems to be absent from western Europe but has been reported from Turkey (Nyman, 1878-82) southern Russia (Ukraine) and the Caucasian republics (Ledebour, 1847-49). The occurrence of C. medium in southern Europe reported by Decaisne (m de CandoUe, 1844) seems
. The Canadian field-naturalist. Moore: The Dog-Strangling Vine 145. ^- ^.. 1 .: ^. , .. 2 Herbarium specimens of (Figure 1) Cynanchum medium Ottawa, Ontario, and (Figure 2)^Cynanchum nigrmti (L.) Pers. Peoria County, Illinois. Robert Brown (1809) described C. medium from a plant cultivated in the Paris Botanic Garden. This species seems to be absent from western Europe but has been reported from Turkey (Nyman, 1878-82) southern Russia (Ukraine) and the Caucasian republics (Ledebour, 1847-49). The occurrence of C. medium in southern Europe reported by Decaisne (m de CandoUe, 1844) seems questionable. These species have been transferred to the genus Vincetoocicum Monch and consequently appear in floras under the following names: Cynanchum vincetoxicum (L.) Pers. or the synonym Vincetoxicum officinale (L.) Moench; C. nigrum. (L.) Pers. or V. nigrum (L.) Moench; C. medium R. Br. or either of the two synonyms V. nigrum (R. Br.) Dene., C. medium (Dene.) K. Sch. The three species can be readily separated by the use of the following key. Flowers greenish white C. â vincetoxicimi (L.) Pers. Flowers purplish Corolla lobes ellipitic-lanceolate, twice as long as broad, glabrous within _____ ,.C. medium Corolla lobes deltoid, as broad as long, fleshy, papillate and pubescent within _____ C. nigrum (L.) Pers. Although not as reliable as the floral characters, the greater length of the flower peduncle is a character of value in the identification of fruiting specimens that no longer bear fresh flowers. The pods of C. medium stand out about one inch from the stem whereas those of C. nigrum, lie close to the twining stem, among the foliage. This character can be seen by comparing the illustrations of the specimen of C. medium (Figure 1) from Ottawa, Ontario, with that of C. nigrum (Figure 2) from Peoria County, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc
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