Dioscoreaceae – Yam Family

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DIOSCOREACEAE – YAM FAMILY Plant: herbs or woody vines Stem: rhizomes present Root: may be tuberous Leaves: entire, simple to lobed, often cordate, mostly alternate but may be opposite or whorled; no stipules Flowers: N.A. species imperfect (dioecious); small, in spikes or racemes; 3 petals, adnate with 3 sepals forming a tube; 6 stamens; ovary inferior, 3 pistils, 3 styles, 3 carpels, ovary 1-3-chambered, 2 or more ovules per carpel Fruit: capsule or berry, some seeds winged Other: (Also known as Tamacaceae); mostly found in tropics and subtropics; Monocotyledons Group Genera: 3-20+ genera; locally Dioscorea (yam) WARNING – family descriptions are only a layman’s guide and should not be used as definitive DIOSCOREACEAE – YAM FAMILY Chinese Yam [Cinnamon Vine]; Dioscorea oppositifolia L. (Introduced) Wild Yam [Yamroot]; Dioscorea villosa L. Chinese Yam [Cinnamon Vine] USDA Dioscorea oppositifolia L. (Introduced) Dioscoreaceae (Yam Family) Wilson’s Creek National Battlefield, Greene County, Missouri Notes: vine; flowers small and inconspicuous, in panicles from leaf axils; leaves opposite but some are usually alternate, leaf base cordate, all veins (7-9) arise from the base of the leaf, mostly glabrous, leaf edge often reddish-purple; fruit a bulbil (above ground tuber) arising at the nodes, plant mostly propagates vegetatively by these bulbils; spring to summer [V Max Brown, 2010] Wild Yam [Yamroot] USDA Dioscorea villosa L. Dioscoreaceae (Yam Family) Oak Openings Metropark, Lucas County, Ohio Notes: vine; flowers of 6 tepals, greenish-white to yellow, small, in mostly upright spikes (racemes); leaves entire, mostly alternate, cordate with a long point, some may be whorled toward base; stem smooth mostly without knobs; fruit a 4-angled capsule; spring to summer [V Max Brown, 2006].

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