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Dioscorea polystachya Decne.
CHINESE YAM
Cinnamonvine; Dioscorea batatas

Life   Plantae   Monocotyledoneae   Dioscoreaceae   Dioscorea

Dioscorea polystachya, whole plant - juvenile
© Copyright Steve Baskauf, 2002-2011 · 4
Dioscorea polystachya, whole plant - juvenile

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Dioscorea polystachya, leaf - basal or on lower stem
© Copyright Steve Baskauf, 2002-2011 · 4
Dioscorea polystachya, leaf - basal or on lower stem
Dioscorea polystachya, stem - showing leaf bases
© Copyright Steve Baskauf, 2002-2011 · 4
Dioscorea polystachya, stem - showing leaf bases

Dioscorea polystachya, stem - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Dioscorea polystachya, stem - unspecified
Dioscorea polystachya, stem - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Dioscorea polystachya, stem - unspecified
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Following modified from Flora of Taiwan, National Taiwan University
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Following modified from Taiwan Biodiversity National Information Network
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Kingdom Plantae  
 Phylum Tracheophyta  
 Class Magnoliopsida  
 Order Dioscoreales  
 Family Dioscoreaceae  
 Genus Dioscorea  
  Dioscorea polystachya    Turcz. 
Provider: Ching-I Peng 
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Synonyms: Dioscorea batatas clavata Dioscorea batatas daikok Dioscorea batatas flabellata Dioscorea batatas rakuda Dioscorea batatas tsukune Dioscorea cayennensis pseudobatatas Dioscorea decaisneana Dioscorea potaninii Dioscorea pseudobatatas Dioscorea rosthornii Dioscorea swinhoei   details
Citation: Flora of Taiwan 2nd ed. 5: 98, 2000
Name Code: 201778
  
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Following modified from Flora of North America
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FNA Vol. 26 Page 478, 480, 481, 483 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 26 | Dioscoreaceae | Dioscorea

3. Dioscorea polystachya Turczaninow, Bull. Soc. Imp. Naturalistes Moscou. 10(7): 158. 1837.

Cinnamon vine, Chinese yam

Dioscorea batatas Decaisne

Plants tuberous; tubers 1—many, on long stalks and deeply buried, spindle-shaped. Stems twining clockwise, unwinged, terete, climbing to 5 m, producing small bulbils (less than 2 cm diam.) in leaf axils. Leaves alternate proximally, usually opposite distally, occasionally ternate, 3—9 × 3—11 cm; petiole as long as blade, base not clasping; blade 7(—9)-veined, hastate-cordate, glabrous, margins 3-lobed, basal lobes spreading, rounded to ± rhombic, median lobe deltate to ovate, apex acuminate or mucronate; primary veins 7(—9); basal leaves often less distinctly lobed or entire and ovate-cordate. Staminate inflorescences axillary, in fascicle of (1—)3—5 spikes, each spike shorter than 5 cm, or primary inflorescence axis elongate and bearing multiple fascicles; spikes bearing flowers singly, flowers bracteate, distributed along rachis in markedly zigzag pattern, internodes less than 2 mm. Pistillate inflorescences 1 per leaf axil, few-flowered, shorter than 5 cm, internodes between mature flowers greater than 1 cm. Staminate flowers: perianth drying dark, tightly cup-shaped; tepals ovate, ca. 1 mm, margins hyaline, apex acute; fertile stamens 6; filaments connate basally; anthers as long as or longer than filaments, thecae distinct, weakly spreading. Pistillate flowers: perianth as in staminate flowers; staminodes 6 in 2 subequal whorls, anthers and filaments more strongly differentiated in inner whorl, filaments less developed in outer whorl, all smaller than fertile stamens. Capsules not reflexed at maturity, broadly ovate, (1.2—) 1.7—2 cm wide. Seeds winged all around. 2n = 140.

Staminate plants flowering summer. Thickets, ravines, stream banks, creek bottoms, limesinks, granite outcrops, alluvial woods, roadsides, drainage canals, waste places, fence rows; 0--500 m; introduced; Ala., Ark., Conn., D.C., Fla., Ga., Ky., Md., Mass., Miss., Mo., N.J., N.C., Ohio, Pa., S.C., Tenn., Va., W.Va.; e Asia.

Dioscorea polystachya is native to eastern Asia, where it is cultivated for its edible tubers. In North America, it is planted as a garden ornamental and has become naturalized throughout much of the eastern United States.

Only one pistillate specimen was encountered from the flora area, the plants apparently propagating vegetatively. Dioscorea polystachya is the earliest published name for this species. The name D. oppositifolia Linnaeus, which has been misapplied to this species, actually refers to an ovate-leaved species that is native to the Indian Subcontinent and is not found in the flora area. For a more detailed nomenclatural history of D. polystachya, see Ting C. T. and M. G. Gilbert (2000).

Updated: 2020-04-08 21:17:48 gmt
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