Cruciferae 



487 



lA. Flowers distinctly pediccllcd, bractlcss, in racemes. 

 2A. Siliques narrowly linear, 15-25 mm. long; style thick and short. 



3A. Flowers apetalous; siliques straight 1. R. dubia 



3B. Flowers with spathulate petals slightly longer than the sepals; siliques more or less arcuate 2. R. indica 



2B. Siliques globose to narrowly oblong, 3-6 mm. long; style slender and short. 



■lA. Siliques cylindric-oblong; biennial 3. /?. islandica 



4B. Siliques globose; perennial 4. /?. nik.ll,oensis 



IB. Flowers subsessile, solitary in leaf-axils 5. R. cantoniensis 



1. Rorippa dubia (Pers.) Hara. Sisymbrhim dubium 

 Pers.; R. sinapis Ohwi & Hara, excl. syn.; Nasturtium hetero- 

 phylhim B!.; Cardamine sublyrataMiq.; N. siiblyratum (Miq.) 

 Fr. & Sav.; R. sublyrata (Miq.) Hara; A^. indicum forma 

 apetahim Makino Michibata-garashi. Glabrous peren- 

 nial with short rhizomes; stems branched at base, 10-20 cm. 

 long, often ascending-spreading, few-leaved; radical leaves 

 narrowly ovate, the lower cauline more or less lyrate, petiolate, 

 4-10 cm. long, irregularly dentate-serrate; racemes 3-5 cm. 

 long, erect or ascending, straight; flowers about 10 in a ra- 

 ceme, small, the pedicels 4-6 mm. long; petals absent; sepals 

 2-2.5 mm. long; siliques narrowly linear, straight, 20-25 mm. 



long, 1-1.2 mm. wide; seeds minute, about 0.5 mm. long. 



May-Aug. In shaded places around houses and on roadsides 

 in lowlands; Honshu, Shikoku, Kyushu. India, China, Ma- 

 laysia, Ryukyus, and Formosa. 



2. Rorippa indica (L.) Hiern. Sisymbrium indicum 

 L.; 5. sinapis Burm.; R. sinapis (Burm.) Ohwi & Hara; Nas- 

 turtium indicum (L.) DC; 5. atrovirens Hornem.; A^ atro- 

 virens (Hornem.) DC; R. atrovirens (Hornem.) Ohwi & 

 Hara; N. montanum Wall, ex Benth.; N. montanum var. 



obtusuhim Miq.; N. obtusulum (Miq.) Koidz. Ind-garashi. 



Resembles the preceding; stems often more branched, 20-40 

 cm. long; terminal segment of radical leaves often larger, 1-2 

 cm. wide, irregularly dentate-serrate, the upper leaves sessile, 

 lanceolate; racemes 4-6 cm. long, often branched below; petals 

 yellow, spathulate, slightly longer than the petals, about 3 

 mm. long; siliques narrowly linear, 15-22 mm. long, about 

 1.2 mm. wide, slightly incurved, the pedicels 5-8 mm. long; 



st>'le thick and short. May-Sept. Rather wet places in 



lowlands, especially in paddy fields and along roadsides; Hok- 

 kaido, Honshu, Shikoku, Kyushu; common. China, Ryu- 

 kyus, Formosa, Malaysia, India, and Africa. 



3. Rorippa islandica (Oed.) Borb. Sisymbrium islandi- 

 cum Oed.; Nasturtium palustre (L.) DC; R. palustris (L.) 

 Bess.; 5. amphibium var. palustre L.; Radicula palustris (L.) 

 Moench Sukashi-tagobo. Nearly glabrous biennial herb; 



stems spreading, branched, 30-50 cm. long; radical leaves 

 petiolate, lyrate, 7-15 cm. long, 15-30 mm. wide, toothed, the 

 cauline leaves sessile, auriculate, toothed, lobed or undivided; 

 racemes 5-15 cm. long, many-flowered, the pedicels spreading 

 or reflexed, 5-7 mm. long; petals cuneate-obovate, about 3 mm. 

 long, slightly longer than tlie sepals, yellow; siliques short, 

 oblong or oblong-cylindric, 4-6 mm. long, 2-2.5 mm. wide; 



style very short; seeds minute. Apr.-Oct. Wet places in 



lowlands especially in paddy fields and along river margins; 

 Hokkaido, Honshu, Shikoku, Kyushu; common. Tem- 

 perate and warmer regions of the N. Hemisphere. 



4. Rorippa nikkoensis Hara. Nasturtium ainphibium 



sensu auct. Japon., non R. Br. Migiwa-carashi. Glabrous 



perennial herb; stems to 50 cm. long, branched; lower leaves 

 lyrate, the upper ones parted to cleft, 7-15 cm. long, 15-50 

 mm. wide, auriculate, the terminal segments narrowly ovate 

 to oblong, irregularly toothed, the lateral segments 2-10, 

 rather small; racemes rather many-flowered, the pedicels 

 spreading, 4-6 mm. long; petals nearly as long as the sepals, 

 1.5-2 mm. long, broadly spathulate; siliques globose or 

 broadly ellipsoidal, 3-4 mm. long, 2-3 mm. wide; style rather 



slender; seeds about 0.8 mm. long. July-Aug. Mountains; 



Honshu (Nikko). 



5. Rorippa cantoniensis (Lour.) Ohwi. Ricotia can- 

 toniensis Lour.; Nasturtium microspermum DC; N. si){pki- 

 anum Fr. & Sav. Ko-inu-garashi. Glabrous branched an- 

 nual or biennial, 10-40 cm. high; leaves cleft, 3-6 cm. long, 

 1-2 cm. wide, irregularly incised and toothed, auriculate, the 

 upper leaves (or bracts) broadly lanceolate, 5-20 mm. long, 

 incised, sessile; flowers solitary in leaf-axils, nearly sessile; 

 petals broadly oblanceolate, about 3 mm. long, slighdy longer 

 than the sepals; siliques short-cylindric, 6-10 mm. long, 2-3 



mm. wide; style short and thick; seeds minute. Apr.-June. 



Edge of paddy fields and along margins of rivers in lowlands; 

 Honshu (Kanto Distr. and westw.), Shikoku, Kyushu; com- 

 mon. China and Manchuria. 



13. CAPSELLA Medic. Nazuna Zoku 



Annual or biennial herbs, stellate-pubescent; radical leaves rosulate, lyrate; stems erect, few-leaved; flowers small, white, bract- 

 less; sepals equal; siliques cuncate or obtriangulate, flattened laterally or subterete, the valves navicular, flattened, keeled on 

 back, the septum narrow, membranous; style short, the stigma sessile; seeds many, wingless; cotyledons incumbent or sometimes 

 accumbent. Few species, in both hemispheres. 



1. Capsella bnrsa-pastoris (L.) Medic. Thlaspi bursa- 

 pastoris L. Nazuna. Annual or biennial herb with sim- 

 ple and stellate hairs; radical leaves lyrate, the cauline lanceo- 

 late, auriculate and sessile, toothed; stems 10-40 cm. long, 

 often branched below; flowers many, in racemes, the pedicels 

 slender; petals obovatc, clawed, about 2-2.5 mm. long; silicles 



obtriangular, glabrous, flattened, 6-7 mm. long, 5-6 nun. 

 wide, shallowly and broadly retuse to emarginate; style short; 



seeds 20-25, obovate, about 0.8 mm. long. Mar.-June. 



Cultivated fields and along roadsides in lowlands; Hokkaido, 



Honshu, Shikoku, Kyushu; very common. Temperate 



regions of the N. Hemisphere. 



