568 



Leguminosae 



side; stamens diadelphous (9 and 1); style flattened, abruptly geniculate at the middle, fimbriate on one side below the stigma, 



extended beyond the discoid stigma into a subulate point; legumes linear or cylindric, sometimes rather flat, many-seeded. 



More than 10 species, in e. and s. Asia. 



lA. Bracteoles longer than the calyx -tube, 4-8 mm. long; hilum of the seeds flat. 



2A. Terminal leaflets ovate to broadly so, broadest below the middle, abruptly acuminate; upper racemes very short-peduncled or 



subsessile; bracteoles 6-8 mm. long, about twice as long as the calyx -tube 1. A. angularis 



2B. Terminal leaflets narrowly ovate, broadest above the base, gradually acuminate; peduncles always distinct; bracteoles slightly longer 



than the calyx-tube, 4-5 mm. long 2. A. reflexopiloia 



IB. Bracteoles shorter than the calyx-tube, 2-2.5 mm. long; hilum of the seeds sulcate; very slender plants with the terminal leaflets 2-5 

 cm. long ^- ^- nakashimae 



1. Azukia angularis (Willd.) Ohwi. DoUchos angularis Hime-tsuru-azuki. Slender twining annual; stems elongate, 



Willd.; Phaseolus angularis (Willd.) W. F. Wight Azuki. retrorsely short-pilose while young; stipules small, 2-3 mm. 



Erector slightly twining annual; cotyledons hypogeal; primary long, the stipels acuminate, the terminal leaflets ovate, some- 

 leaves simple, long-petioled, cordate; stems 30-80 cm. long, times lanceolate, 2-5 cm. long, loosely appressed-pilose; ra- 

 sparsely branched above, sometimes slightiy twining above; cemes 2- to 5-flowered, long-peduncled, the bracteoles lanceo- 

 ordinary leaves petioled, spreading-pilose especially on under late, 1-nerved, acute, slighdy shorter than the calyx-tube; 

 side, the terminal leaflets broadly ovate, usually 3-lobed, 6-10 flowers about 10 mm. across; legumes linear, 3-4 cm. long, 



cm. long, 5-8 cm. wide, the stipels lanceolate, acuminate; ra- smooth, the seeds ellipsoidal, dark brown. July-Sept. 



cemes short-peduncled or subsessile, sometimes long-peduncled, Kyushu; rare. Korea and Manchuria. The following are 



the bracteoles narrowly ovate, few-nerved, acute; flowers 15- cultivated in our area. 



18 mm. across; legumes pendulous, linear, 6-10 cm. long, Azukia umbellata (Thunb.) Ohwi. DoUchos umbellatus 



nearly glabrous, slighdy inflated above the ellipsoidal seeds, Thunb.; Phaseolus calcaratus Roxb. Tsuru-azuki, Kani- 



the hilum flat. Aug.-Sept. Widely cultivated in our area. me. Stems strongly twining, slender, soft-pubescent; cotyle- 



Var. nipponensis (Ohwi) Ohwi. Phaseolus nipponensis dons hypogeal; primary leaves lanceolate, long-petiolate; termi- 



Ohwi; P. angularis var. nipponensis (Ohwi) Ohwi ^Yabu- nal leaflet of the ordinary leaves narrowly ovate; bracteoles 



TSURU-AZUKI. Twining and more slender; terminal leaflets linear, 1-ribbed, acuminate, about twice as long as the calyx; 

 narrowly ovate; racemes pilose; legumes blackish, 4-5 cm. racemes elongate, long-peduncled; legumes narrow, slighdy in- 

 long, the valves thinner. Aug.-Sept. Thickets and grassy curved, scarcely inflated over the seeds; seeds cylindric-oblong, 



places in lowlands; Honshu, Shikoku, Kyushu; rather com- the hilum sulcate. Introduced from India. 



mon. Azukia radiata (L.) Ohwi. Phaseolus radiatus L.; P. 



2. Azukia reflexopilosa (Hayata) Ohwi. Vigna re- aureus Roxb.; Rudua aurea (Roxb.) F. Maekawa Bundo, 



flexopilosa Hayata; Phaseolus reflexopilosus (Hayata) Ohwi Yae-nari. Stems erect or slighdy twining, yellowish brown 



O-yaeu-tsuru-azuki. Coarsely pilose twining annual, hispid; cotyledons epigeal; primary leaves broadly lanceolate, 



allied to the preceding variety, but slightly larger, with longer short-petioled; terminal leaflet of ordinary leaves orbicular- 

 peduncles, and elongate racemes and smaller bracteoles; leg- ovate, hispid, dark brown when dried, the stipels caudate, the 

 umes pendulous, 5-6 cm. long, 4-5 mm. wide, nearly straight, bracteoles deciduous, broadly ovate, obmse, several-ribbed, 

 dark brown, the seeds black with paler blotches, truncate at shorter than the calyx-tube; legumes spreading, straight, 



both ends, 3.5 mm. long, the hilum flat. Kyushu (Hyuga slightly flattened, hispid to scabrous, the seeds rather small, 



Prov.) ; rare. Ryukyus and Formosa. ellipsoidal, green or dark brown, the hilum sulcate. Intro- 



3. Azukia nakashimae (Ohwi) Ohwi. Phaseolus na\a- duced from India. 

 shimae Ohwi; P. minimus sensu auct. Japon., non Roxb. 



25. VIGNA Savi Sasage Zoku 



Twining or trailing, sometimes erect herbs; leaves pinnately 3-foliolate, the stipules rather small, sometimes peltate; racemes 

 axillary, with thickened nodes, the bracteoles small, deciduous; flowers yellow to reddish purple, sometimes white, in pairs; 

 legumes linear, rather cylindric, often inflated at the seeds, dehiscent, 2-valved, the seeds several to many, nearly globose to 

 reniform, with a short hilum. About 60 species, widespread in warmer and tropical regions. 



lA. Keel distinctly beaked and incurved; leaflets membranous, coarsely pilose, acuminate; flowers large, 25-30 mm. long and as wide, 

 bluish purple, becoming reddish brown; calyx-teeth narrowly lanceolate, acuminate, as long as the tube. 



1. V. vexillata var. tsusimensis 



IB. Keel not beaked; leaflets rather thick, chartaceous or herbaceous, often glabrescent, acute to obtuse; flowers smaller, 15-18 mm. long 

 and as wide, yellow; calyx-teeth strongly depressed-triangular, much shorter than the tube 2. V. manna 



1. Vigna vexillata (L.) Benth. var. tsusimensis Matsum. 

 Aka-sasage. Twining perennial, the stems rather slender, 

 spreading to reflexed brown-pilose; stipules broadly lanceolate, 

 few-nerved, 3-4 mm. long, acuminate, attached slightly above 

 the base; leaflets coarsely pilose on both sides, the terminal 

 6-10 cm. long, 3-4 cm. wide, the stipels small, linear; ra- 

 cemes very short, umbellike, 2- to 4-flowered, on a long pedun- 



cle 10-20 cm. long, the bracteoles lanceolate, caducous, the 

 pedicels very short; calyx short-hispid, 8-10 mm. long, the 

 teeth rather equal; keel gradually curved; legumes densely 



brown-hispidulous. Sept.-Oct. Kyushu; rare. A variable 



widespread plant of tropical regions. 



2. Vigna marina (Burm.) Merr. Phaseolus marinus 

 Burm.; DoUchos luteus Sw.; V. lutea (Sw.) A. Gray; V. 



