Compos iTAE 



901 



1 B. Achenes linear, narrowed to the tip. 



5A, Achenes 2-a\vned; leaves much dissected, the ultimate segments about 2 mm. wide; tubular corollas 4-toothcd 5. B. parviflora 



5B. Achenes 3- or 4-awncd; leaves at most 2 or 3 times pinnate; tubular corollas 5-toothed. 



6A. Involucral bracts spathulate, broadened at tip; leaves usually ternate 6. B. pilosa 



6B. Involucral bracts lanceolate, not broadened at tip; leaves usually 2 or 3 times pinnate. 



7A. Terminal leaf segments narrow, acuminate, few-toothed 7. B. bipinnata 



73. Terminal leaf segments ovate, short-acuminate, rather prominently toothed 8. B. hitcrnata 



1. Bidens cernua L. S. cemua var. radiata DC. Sept. Wet places; Hokkaido. s. Kuriles, Sakhalin, Korea, 



Yanagi-ta-ukogi. Stems 25-90 cm. long, branched, short- Manchuria, and Dahuria. The typical phase occurs from Si- 

 pilose or glabrate; leaves lanceolate, 8-17 cm. long, acuminate beria to Europe. 



at both ends, mucronate-toothed, minutely scabrous on both 5. Bidens parviflora Willd. Hosoba-sendangusa. 

 surfaces; upper leaves slighdy dilated, clasping at base; heads Stems 20-70 cm. long, often short-hairy; median leaves 2 or 3 

 ligulate; involucral bracts 5-7, herbaceous, lanceolate, about 2 times pinnately compound, short-hairy above, with longer hairs 

 cm. long; ligulate corollas 12 mm. long, about 5 mm. wide, on nerves beneath, the petioles 2-3 cm. long, the leaflets pin- 

 yellow; tubular corollas 5-toothed; achenes narrowly cuneate, nately divided and again pinnatilobed to pinnatiparted, or 

 4-angled, retrorsely spinulose on the angles, the awns 4, 2 or 3 toothed, the ultimate segments oblong, about 2 cm. wide, 



mm. long. Sept. Wet places; Hokkaido, Honshu (n. acute; heads eligulate; outer involucral bracts herbaceous, 4 or 



distr.). Korea, China, and widely distributed in the N. 5, lanceolate, 4 mm. long in anthesis, 6-9 mm. long in fruit, 



Hemisphere. gradually narrowed at apex, the chaff 10-12 mm. long in fruit; 



2. Bidens frondosa L. Amerika-sendangusa. Stems tubular florets 6-12; achenes linear, 13-16 mm. long, about 1 

 1-1.5 m. long, nearly glabrous; leaves and leaflets petiolate, mm. wide, tetragonous, compressed, short-strigose, the awns 2, 



the leaflets 3-5, lanceolate to lanceolate-ovate, 3-13 cm. long, 3-3.5 mm. long. Sept. Honshu (centr. distr. and westw.), 



coarsely toothed; heads ligulate; involucral bracts foliaceous, Kyushu. Korea, Manchuria, China, and e. Siberia. 



tlie inner bracts and chaff 5-9 mm. long; ligulate corollas 6. Bidens pUosa L. Ko-sendangusa. Stems 25-85 



short, yellow; tubular corollas 4-toothed; achenes cuneate, the cm. long, loosely crisped-pilose in upper portion; median leaves 



outer ones 5-7 mm. long, the inner ones 7-10 mm. long, the 12-19 cm. long inclusive of the petiole, usually ternate, loosely 



awns 2.5-5 mm. long. Sept.-Oct. North American weed short-hairy on both sides, the lateral segments ovate, acute, 



widely naturalized in lowlands in our area. short-peUolate, the terminal segments ovate or narrowly so, 



3. Bidens tripartita L. B. taquetii Lev. & Van't.; S. short-acuminate; involucral bracts 7 or 8, spathulate, 3-4 mm. 



shimadae Hayata; B. tripartita var. cernuaejoUa Sherff. long in anthesis, 5 mm. long in fruit, the inner chaff to 9 mm. 



Ta-ukogi. Stems 20-150 cm. long, glabrous, branched; me- long, narrow; heads eligulate; tubular corollas 5-toothed; 



dian leaves simple, oblong-lanceolate, or more commonly achenes linear, 7-13 mm. long, about 1 mm. wide, flat, 4- 



3(-5)-parted, the terminal segments larger, oblong-lanceolate, angled, short-strigose, the awns 3 or 4, 1.5-2.5 mm. long. 



toothed, gradually narrowed at both ends, the lateral seg- Kyushu (Hyuga Prov.). Widespread in tropical regions, 



mcnts spreading, die petioles more or less winged, 5-13 cm. Var. minor (Bl.) Sherff. B. sundaica var. minor Bl.; B. 



long; heads eligulate, the involucral bracts oblanceolate, 1.5- pilosa var. radiata Schultz-Bip.; B. albiflora Makino; B. pilosa 



4.5 cm. long in fruit, the outer chaff oblong, 9-11 mm. long; var. albiflora Maxim. Shirobana-sendangusa. Heads 



tubular corollas 4-toothed; achenes 7-11 mm. long, retrorsely with 5-7 sterile ligulate florets, the corollas 5-8 mm. long, 



spinulose on margin and ribs, the well-developed awns 2, 3-4 3.5-5 mm. wide, white. Honshu and Kyushu. Korea, 



mm. long, with 1 or 2 additional imperfect ones at the tip. China, Formosa, Ryukyus, and generally in the tropics. 



Aug.-Oct. Hokkaido, Honshu, Shikoku, Kyushu. 7. Bidens bipinnata L. B. pilosa var. bipinnata (L.) 



Formosa, Ryukyus, China, Korea, Eurasia to N. Africa, and Hook. f. Koba-no-sendangusa. Stems 25-85 cm. long, 



Australia. slighdy hairy on upper part; median leaves 11-19 cm. long, 



Var. repens (D. Don) Sherff. B. repens D. Don; B. mi- slightly hairy on both sides, bipinnately parted, the petioles 



nuscula Lev. & Van't. Hai-ta-ukogi. Stems 1-40 cm. 3.5-5 cm. long, the lower segments often 2 or 3, or pinnately 



long; leaves or the segments unequally and coarsely toothed; cleft, the terminal segments narrow, acuminate, few-toothed 



achenes 6.5-7.5 mm. long, glabrous; awns 2, 2-3 mm. long, near base; involucral bracts 5-7, lanceolate, 2.5 mm. long at 



retrorsely spinulose or smooth. Reported in Honshu (Oomi anthesis, to 5 mm. long in fruit, the outer chaff 3.5-4 mm. 



Prov.). Korea, China, India, and Malaysia. long in anthesis, 6-8 mm. long in fruit; ligulate florets 1-3, 



4. Bidens radiata Thuill. var. pinnatifida (Turcz.) sterile, the corollas yellow, 5-6 mm. long, 2.5-3 mm. wide; 

 Kitam. B. tripartita var. pinnatifida Turcz. ex DC; B. maxi- achenes linear, 12-18 mm. long, about 1 mm. wide, flat, 3 or 4 



motvicziana Oett. Ezo-no-ta-ukogi, Kik.uba-ta-ukoci. angled, more or less short-strigose, the awns 3 or 4, 3-4 mm. 



Stems 15-70 cm. long, nearly 4-angled, nearly glabrous; me- long. Aug.-Oct. Waste grounds; Honshu. Korea, 



dian leaves about 15 cm. long inclusive of the petiole, glabrous, Manchuria, China, Malaysia, India, Australia, Europe, and 



pinnately parted, the segments 2 or 3 pairs, usually linear- America. 



lanceolate, acuminate, with incurved coarse teeth, the terminal 8. Bidens bitemata (Lour.) Merr. & Sherff. Coreopsis 



segments larger, lanceolate, acuminate, lobulate; involucral bitemata Lour.; B. chinensis Willd.; B. pilosa sensu auct. 



bracts 12-14, 1-seriate, foliaceous, 2-3.5 cm. long, rarely to 7 Japon., non L.; B. robcrtianaejolia Lev. & Van't. Sendan- 



cm. long, linear-lanceolate, pinnately lobulate, the outer chaff gusa. Stems 30-150 cm. long, subtctragonous, loosely 



about 8 mm. long; ligulate corollas absent; tubular corollas crisped-pilose; median leaves 9-15 cm. long inclusive of the 



4-toothed; achenes flat, 4.5-5.5 mm. long, glabrous, rcu-orsely 5-cm.-long petiole, prominendy soft-pubescent on both sur- 



spinulose on margins, the awns 2, 2.5-3 mm. long. Aug.- faces, once or twice pinnately parted, the terminal segments 



