23 



Scirpus (Monostacbyi) pseudo-fluitans Makino sp. nov. 

 Quite pale green. Roots c^espitose, fibrous. Stems caespitose, simple, 

 or loosely short-ramose above, decumbent, radicant, multinodulose, partly 

 enclosing with sheaths of leaves, foliate throughout, slender, terete, smooth, 

 attaining about 32 cm. in length, the internodes much shorter than leaves. 

 Leaves alternate, but subfasciculate at the top of stems, sheathing at the 

 base, angustato-linear, entire with smooth edges, but hardly scabrous towards 

 the apex, acute or subobtuse, flat but often shallowly subcanaliculate below 

 in front, flatly rounded dorsally, rather thickish, rather strongly 3-4-nerved, 

 with very loose transverse distinct veinlets between nerves, attaining 16 cm. 

 long including the shething portion, |-2 mm. wide ; sheath tubular and 

 often at length breaking, with a suhtruncate mouth, i)ale-membranaceous, 

 attaining 2J cm. in length. Peduncles 1 or 2 (approximately placed) at 

 the top of stems, slender, rather stout, compressed (oblong in section), 

 with smooth edges, slightly contracted at the top, monostachyus, shorter 

 or longer than leaf-like bracts, but, when there 2 present, its superior one 

 enclosed by sheaths with a much reduced lamina, 5-14 cm. long, enclosed 

 with the sheath of bracts at the base. Spickelet solitary, terminal, ellip- 

 tical to oblong, obtuse or acutish-obtuse, 5-7 mm. long in flower, many- 

 flowered (about 17-30 in number), glumes all fertile, without inferior empty 

 glume. Glumes densey imbricated, ovate to oblong-ovate, obtuse, hyalino- 

 membranaceous towards the quite entire margin, green towards the midrib, 

 concave, subcarinate with a smooth edge, delicately and indistinctly 6-9-striate 

 on each side of the midrib, 4-4i ram. long, 2-3 mm. broad, the outermost 

 one erect, shorter or sometimes somewhat longer than spikelet, with a flower 

 in its axil, subulato-oblong to oblong-linear, or linear, acute or subobtuse, 

 entire, often leaf-like and thickish above, 3-4-nerved, with transverse veinlets 

 between nerves, dilated and embracing the base of spikelet at the base, 

 4-9 mm. long. Rachilla notched, glabrous. Stamens 3 ; filaments fiH- 

 form ; anther linear, yellow, subbifid-truncate at the base, acute with a 

 connective-tip at the apex, about li mm. long. Ovary sessile, oblong- 

 elliptical, compressed, smooth, pale, about 1 ram. long ; style much longer 

 than the ovary, about 5^ mm. long, rather stout, very deeply bifid, arms 

 filiform, minutely puberulent, much longer than the smooth connate portion. 



Nora. Jap. Bijalcko-i, Uki-i (nov.). 



Hah. Prov. Iwashiro : Tonokuchi-hara {G. XakaJiara \ Aug. 1904); 

 Prov. Shimotsuke : Otahara (T. Watanahel Jan. 3, 1905). 



Rare. This species is very closely allied to Scirjms Jluitans Linn., 

 from which it differs by its robustness and stifihess in every respect, quite 



