Cruciferae 



489 



below, the cauline sessile, broadly linear, 5-12 mm. long, 1.5-2 

 mm. wide; racemes glabrous, rather few-flowered; petals about 

 3.5 mm. long, cuneate-obovate; silicles broadly linear, often 

 slightly contorted; style minute; seeds with obtuse margin, not 



appendaged, 1-1.5 mm. long. July-Aug. Dry gravelly or 



rocky slopes in alpine regions; Honshu (centr. distr., on 

 Mount Shirouma and in Akaishi Mts.) ; rare. 



Draba okamotoi Ohwi is a sterile, alleged hybrid possibly 

 between D. shiroumana and Arabis tanal^ana. 



7. Draba kitadakensis Koidz. D. na\aiana Hara; D. 



\amtschatica var. yezoensis Nakai; D. oiana Honda Kita- 



D.\KE-NAZUNA, SouN-NAZUNA. Perennial gray-green herb, 



densely appressed stellate-puberulent; stems 10-15 cm. long, 



short-branched and with short sterile shoots at base, erect, 3- 

 to 10-leaved; rosulate leaves oblanceolate or narrowly so, 6-12 

 mm. long, 1.5-3 mm. wide, acute, narrowed at base, few- 

 toothed or entire, the cauline narrowly ovate or broadly 

 lanceolate, 8-20 mm. long, acute, toothed; racemes rather 

 densely more than 10-flowered, the pedicels 3-7(-15) mm. 

 long, densely minute-puberulent; petals about 3 mm. long, 

 narrowly cuneate-obovate; silicles lanceolate, contorted, 7-10 

 mm. long, about 2 mm. wide; style 0.2-1.5 mm. long, the 

 stigma scarcely thickened, truncate; seeds about 1 mm. long, 

 obtuse on margin, not tailed. — —May-June. Rocky cliffs in 

 mountains; Hokkaido, Honshu (e. Shinano and Kai Prov.); 

 rare. 



15. ARABIS L. Hatazao Zoku 



Annuals, biennials, or perennials, nearly glabrous or with bifurcate, stellate, or simple hairs; radical leaves usually spathulatc, 

 toothed or entire, the cauline sessile, often toothed or lobed; racemes bractless; flowers white or rose-purple; sepals obtuse, equal 

 or the lateral ones gibbous; petals clawed, entire, longer than the sepals; siliques linear, sessile, the valves flat, sometimes with a 

 midrib, the septum membranous; style short, the stigma simple or shallowly bilobed; seeds in 1 or sometimes 2 series, flat, some- 

 times narrowly winged on margin; cotyledons accumbent. Many species, mainly in temperate to northern regions of the N. 



Hemisphere. 



lA. Cauline leaves sessile and clasping or when not clasping, the plants erect, 50-80 cm. high; radical leaves entire or toothed. 

 2A. Cauline leaves auriculate and clasping, at least in the lower ones. 

 3 A. Petals 5-10 mm. long, cuneate-obovate, white. 



"lA. Siliques nearly appressed to the axis; style 0.3-0.7 mm. long, stout \. A. steUeri var. japonica 



4B. Siliques spreading to ascending, rarely suberect; style usually about 2 mm. long, slender 2. A. serrata 



3B. Petals 4—5 mm. long, cuncate-oblanceolate, white or creamy white; siliques obliquely ascending, erect, or appressed. 



5A. Seeds narrowly winged; plant coarsely hirsute; petals white; seeds 1-seriate 3. A. hirsiita 



5B. Seeds not winged; plant glaucous, coarsely pubescent only on lower half; petals creamy white; seeds imperfectly 2 -seriate. 



"t. A. glabra 

 2B. Cauline leaves not auriculate or clasping. 



6A. Stems 50-80 cm. long, often branched above, hispid; cauline leaves hispid; petals cuneate-oblanceolate, 3-4 mm. long; siliques 



nodding or pedulous 5. A. pendiila 



6B. Stems scapelike, 3-25 cm. long, simple, appressed stellate-pubescent; cauline leaves appressed stellate-pubescent; petals cuneate- 

 obovate; siliques spreading to ascending. 

 7A. Style 3-5 mm. long; plants stoloniferous; leaves toothed, 1-7 cm. long, 8-12 mm. wide; petals 7-12 mm. long. 



6. A. ftagellosa 

 7B. Style less than 3 mm. long; stolons absent; leaves entire, 3-10 mm. long, 1-3 mm. wide; petals 2.5-3 mm. long. 



7. A. tanakana 

 IB. Lower cauline leaves often petioled; radical leaves usually lyrate. 



8A. Siliques (2.5-)3— 4 cm. long, not torulose or scarcely inflated; style stout, about 0.5 mm. long; stems erect, bearing no innovation- 

 shoots on the upper part. 

 9A. Green or only slightly glaucescent perennial; seeds rather many, 1.5 mm. long, with a narrow wing at the end. 



8. A. lyrata var. kamtschatica 



9B. Glaucescent biennial; seeds many, about 1 mm. long, wingless 9. A. I^awasal^iana 



8B. Siliques 10-20 mm. long, slightly torulose and somewhat inflated; style slender, about 1 mm. long; stems usually decumbent after 

 anthesis and bearing innovation-shoots 10. A. gemmijera 



1. Arabis stelleri DC. var. japonica (A. Gray) F. rata (Fr. & Sav.) Makino; A. serrata var. platycarpa Ohwi 



Schmidt. A. stelleri sensu auct. Japon., non DC; A. alpina Fuji-hatazao. Usually more or less tufted perennial with 



var. japonica A. Gray; A. japonica (A. Gray) A. Gray; A. 2- to 4-branched short hairs; stems 10-30 cm. long, few-leaved; 



yoJipscensis Fr. & Sav. Hama-hatazao. Rather densely radical leaves rosulate, 1.5-7 cm. long, 8-15 mm. wide, promi- 



hairy with usually 2- to 3-branched hairs; stems erect, rather nendy coarse-toothed, narrowed to the relatively long petiole; 



stout, 20-40 cm. long; radical leaves oblong to oblanceolate, flowers white, few to rather many; petals cuneate-obovate, 



3-7 cm. long, 8-25 mm. wide, few-toothed, gradually nar- 6-10 mm. long; siliques 3.5-6 cm. long, 1.5-2 mm. wide; 



rowed to a rather broad petiole at base; racemes often slightly style 1.5-2 mm. long; seeds 1.2 mm. long, narrowly winged. 



branched; flowers rather large and many; siliques appressed July-Aug. Rocky or sandy places in mountains; Honshu 



to the axis, dense, 4-6 cm. long, 1.5-2 mm. wide; style short (Mount Fuji); very variable. 



and stout; seeds narrowly winged, about 1.5 mm. long, in 1 Var. sikokiana (Nakai) Ohwi. A. boissieuana var. sikpki- 



series. Apr.-June. Dunes along the sea; Hokkaido, Hon- ana Nakai; A. siliokiana (Nakai) Honda Shikoku-hata- 



shu, Shikoku, Kyushu; common. Korea, Amur, and Sak- ZAO. Radical leaves long-attenuate at base; siliques 7-9 cm. 



halin. long. Mountains; Honshu (Tokaido and Kinki Distr. and 



2. Arabis serrata Fr. & Sav. A. amplexicauUs var. scr- westw.), Shikoku, Kyushu. Korea (Quelpaert Isl.). 



