檢視Dioscorea polystachya的原始碼

[[Dioscoreaceae]]

''Dioscorea batatas'' Decne.

2. ''Dioscorea batatas'' Decne. in Rev. Hort. Ser. 4, 3:243. 1854; Bentham, Fl. Hongkong 368. 1861; Prain & Burkill in Journ. Asiat. Soc. Bengal n.s. 10:27. 1914; Knuth in Engl. Pflanzenr. 87(4-43):261,f.55. 1924; Sasaki, List Pl. Form. 113. 1928; Hand.-Mazz., Symb. Sin. 7:1240. 1936; Nemoto, Fl. Jap. Suppl. 1083. 1936; Prain & Burkill, Ann. Bot. Gard. Callcutta 14(2):243. 1939; Ohwi, Fl. Jap. 314. 1965; Liu, T. S. & T. C. Huang in Bot. Bull. Acad. Sin. 3(2):142. 1962; Liu, T. S. & T. C. Huang in Fl. Taiwan 5:101. 1978.

BY:Liao chunkuei


==SYNONYMS==


==HABIT　DESCRIBE==

　A glabrous, scandent vine from annual tuber; underground tuber cylindrical, growing down vertically to 1m long; epidermis greyish or brown; flesh white, edible, never poisonous; aerial stems annual, dextrorse, terete, herbaceous, ridged, green or violet; axillary aerial tubers globose and somewhat irregular branched, 5-15 mm long, 5-10 mm in diameter, greyish, glabrous, with reticulate lines and warts on surface.  Leaves opposite or alternate near the base of stem, occasionally whorled, thick chartaceous, ovate-triangular, 3-10(16) cm long, 4-6(14) wide, 3-lobed, acuminate at apex, cordat or hastate or auricalate at base, warped inward, glabrous, green on both surfaces; nerves 7-9, concave at upper surface and convex at lower surface; petioles violet, 1.5-2 cm long, 2-3 mm thick, twisted and dilated at base, sulcate above.

　Staminate inflorescence axillary, spicate, 1-3 together; spikes with 25 flowers, 2-3 cm long; rachis zigzag, greenish, rigid.  Male flowers alternate on rachis, globose, 1.5-2 mm in diameter, 2-bracted; outer bract widely ovate, ca. 2.2 mm long, ca. 1.1 mm wide, acuminate at apex; inner bract widely depressed ovate, ca. 1.5 mm long, ca. 1.2 mm wide, acute at apex, round at base; perianths 6, yellow-green with black- brown short-line spots; outer 3 perianths ovate, ca. 1.7 mm long, ca. 1.1 mm wide, obtuse at apex; inner 3 perianths ovate, ca. 1.5 mm long, ca. 1.2 mm wide, acute and thickened at apex; stamens 6, subequal; filament ca. 1.2 mm long, terete; anthers oblong, ca. 0.8 mm long, ca. 0.4 mm wide, dorsifixed, longitudinally dehiscent; pistillodium rudimentary, conicus, ca. 0.5 mm tall; stigmatiform 3-lobed.  Pistillate inflorescence spicate, axillary, pendulous.  Fruit capsulate, pendulous, tripterous.  Seeds orbicular, broadly membranously winged around.

This introduced species has been cultivated for a long time.  It has  never been collected in the field of Taiwan. 

The species is flowering from June to September, fruiting from July to November.



==SPECIMENS EXAMINED==

SPECIMENS EXAMINED.  Kaohsiung Hsien: K’ao-t’an (Fenshan-shih) , C. K. Liao 990,991 (NSYSU).


== GALLERY ==

<gallery>
圖像:TsugaLiao_Dioscorea_batatas_6187.JPG|By:Liao chunkuei
圖像:TsugaLiao_Dioscorea_batatas_6189.JPG|By:Liao chunkuei
圖像:TsugaLiao_Dioscorea_batatas_6190.JPG|By:Liao chunkuei
圖像:TsugaLiao_Dioscorea_batatas_6192.JPG|By:Liao chunkuei
圖像:TsugaLiao_Dioscorea_batatas_6193.JPG|By:Liao chunkuei
圖像:TsugaLiao_Dioscorea_batatas_6194.JPG|By:Liao chunkuei
圖像:TsugaLiao_Dioscorea_batatas_6195.JPG|By:Liao chunkuei
</gallery>