Yams (Dioscorea) of Northeastern North America

Wild Yam, Dioscorea villosa Chinese Yam, Dioscorea polystachya

Key to the Dioscorea Species of Northeastern North America

1a. Vine from rhizomes; leaf axils without aerial tubers; mature petioles nearly circular in cross section; leaves ovate-cordate, the sides evenly convex, basal lobes absent; fruits winged..... Dioscorea villosa

1b. Vine from woody tuber; leaf axils often with aerial tubers; mature petioles strongly channeled; leaves hastate, sides with some concavity, basal lobes usually present; fruits unknown in North America..... Dioscorea polystachya

Dioscorea polystachya Turcz. – Chinese Yam, Cinnamon Vine
Introduced; NYS Prohibited; present in NYC. Description. iNaturalist observations from New York City. GloBI interactions.
Indiana non-native plant invasiveness ranking form. Pest Risk Management Document for Dioscorea polystachya (Chinese yam) in Canada

Dioscorea villosa L. – Wild Yam
Indigenous; (CoC 6); present in NYC. Description. iNaturalist observations from New York City. GloBI interactions.

פורסם על-ידי danielatha danielatha, נובמבר 16, 2020 06:11 אחה"צ

תגובות

So it seems that the native species has not yet been recorded from Manhattan?

פורסם על-ידי susanhewitt לפני יותר משנה (סמן)

That's right. There are only observations and specimens from the Bronx and Staten Island. It's more common off the Coastal Plain. It is cultivated at Battery Park: https://www.inaturalist.org/observations/53973372

פורסם על-ידי danielatha לפני יותר משנה (סמן)

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