Cruciferae 491 



16. ARABIDOPSIS Heynh. Shiro-inu-nazuna Zoku 



Biennials or perennials with tlie habit of Arabis l{au'asa\iana, the hairs bifurcate; radical leaves lyrate; flowers white, small, in 



racemes; style very short, the stigma bilobed; siliques narrowly linear; seeds in 1 or 2 series; cotyledons incumbent. Few 



species, in the N. Hemisphere. 



1. Arabidopsis thaliana (L.) Heynh. Arabis thaliana petals oblanceolate, about 3 mm. long; stamens slightly 



L.; Slenop/iragma tbaliana (L.) Cehk.; Arabii piibicalyx Miq.; shorter than the petals; siliques obliquely spreading to sub- 



Arabis thaliana var. pubicalyx (Miq.) Makino 5hiro-inu- erect, 15-20 mm. long, about 0.7 mm. wide; seeds about 0.5 



NAZUNA. Biennial herb; stems 20-30 cm. long, branched mm. long, the margin obtuse. Mar.-May. Sunny grassy 



below, often with simple spreading hairs on the lower portion; places in lowlands, especially near the sea; Hokkaido, Honshu, 



radical leaves rosulate, 1-5 cm. long, broadly oblanceolate, Shikoku, Kyushu. Europe, Africa, centr. Asia, China, Ko- 



3-15 mm. wide, gradually narrowed below, with few obsolete rea, and N. America. 

 teeth, the hairs bifurcate, the cauline leaves few or absent; 



17. DONTOSTEMON Andrz. Hana-hatazao Zoku 



Erect annual, biennial, or perennial branched herbs, the hairs simple, often glandular-tipped; leaves entire to pinnately cleft; 

 flowers in bracdess racemes, rather small, pale rose to white; sepals equal; stamens of the longer 4 with the filaments united in 

 pairs; siliques linear-cylindric, angled, the valves inflated; style short, stout, the stigma simple; seeds many, in 1 series, somedmes 

 margined; cotj'ledons linear, incumbent. Few species, in e. Asia. 



1. Dontostemon dentatus (Bunge) Ledeb. Andreos\ia as the sepals; siliques 4-5 cm. long, about 1.5 mm. across, the 



dentata Bunge. Hana-h.w.izao. Biennial with short in- pedicels 7-10 mm. long, rather stout, obliquely spreading, gla- 



curved puberulence; stems erect, rather firm, 25-50 cm. long, brous, straight or slighdy curved; style stout and short; seeds 



often branched, puberulent; leaves rather many, pedolate in narrowly margined, about 1.5 mm. long. June-July. Hon- 



the lower ones, sessile in the upper, lanceolate, 2-8 cm. long, shu (centr. distr. and s. part of n. distr.) ; rare. 



3-10 mm. wide, sparingly toothed, narrowed at both ends, Var. glandulosus Maxim. Nebari-hana-hatazao. Hairs 



sparsely puberulent; flowers rather many; petals 8-10 mm. glandular. Occurs with the typical phase. e. Asia. 



long, obovate, clawed, pale rose-purple, about 2.5 times as long 



18. BERTEROEIXA O. E. Schulz Hana-nazuna Zoku 



Erect branched stellate-pubescent annuals; cauline leaves rather numerous, obovate-oblong or oblanceolate, narrowed below, 

 nearly sessile, entire, rounded and mucronate at apex; petals pale rose; filaments of the inner stamens dilated at base; siliques 

 sessile, stellate-puberulent, linear, the valves 3-nerved; style rather long, glabrous, the stigma small, truncate; seeds wingless; 

 cotyledons incumbent. A single species. 



1. Berteroella maximowiczii (Palib.) O. E. Schulz. 3-8 mm. long; petals 3-4 mm. long, cuneate-oblong; siliques 



Sisymbrium maximowiczii Palib. Hana-nazuna. Gray- white-pubescent, erect, subulate-linear, 10-12 mm. long; style 



green biennial, densely stellate-pubescent; stems erect, 20-40 about 2.5 mm. long; seeds few, about 1.5 mm. long. May- 

 cm. long, often branched above; leaves 1.5-3 cm. long, 5-13 Oct. Honshu (Chugoku Distr.), Kyushu (Tsushima Isl.); 

 mm. wide; racemes many-flowered, the pedicels erect, slender, rare. Korea, Manchuria, and n. China. 



19. DESCURAINIA Webb & Berthel. Kujiragusa Zoku 



Annuals, biennials, or perennials, the minute hairs stellate or bifurcate; stems usually branched, leafy; leaves pinnate or 

 bipinnate; flowers small, white or yellow, in bracdess racemes; siliques linear, on long slender pedicels, the valves 1-nerved; style 



very short, the stigma simple; seeds small, in 1 or 2 series; cotyledons incumbent. About 40 species, in the N. Hemisphere and 



S. America. 



1. Descurainia sophia (L.) Prantl. Sisymbrium sophia mm. long; petals oblanceolate, white, about 2.5 mm. long, 



L. Kujiragusa. White-pubescent annual or biennial; slighdy longer than the sepals; siliques narrowly linear, 15-25 



stems erect, 30-60 cm. long, sometimes branched; leaves ses- mm. long, about 1 mm. across, ascending, slightly curved; 



sile, 3-5 cm. long, 2-2.5 cm. wide, narrowly ovate, bipinnate, seeds about I mm. long, unappendaged, in 1 series. June- 



the ultimate segments oblanceolate, subentire, 3-5 mm. long, Aug. Honshu (centr. distr., naturalized in Kanto Distr.). 



1-1.5 mm. wide; flowers small, the pedicels slender, 10-15 Europe and Asia. 



20. ERYSIMUM L. Ezo-suzu-shiro Zoku 



Annuals, biennials, or perennials, the hairs appressed, 2- or 3-branched or stellate, rarely tomentosc; stems erect, branched; 

 leaves linear to oblong, entire, sinuate, toothed or rarely pinnatifid; racemes bractlcss; flowers yellow, orange-yellow or rarely 

 purple; lateral sepals gibbous; stamens free, entire; siliques linear, 4-angled, terete or sometimes flat, the valves linear, often 

 1-nerved, the replum often keeled on back; style short or elongate, the stigma 2-lobed, capitate or emarginate; seeds in 1 scries, 

 oblong; cotyledons incumbent. About 100 species, in the temperate regions of the N. Hemisphere. 



