21 



lateral ones patent-reflexecl, slightly oblique in shape, ovato-lanceolate or 

 oblong-lanceolate, obtuse, longer than the upper one, 3-5-nerved, 8-10^ mm. 

 long. Petals erect, slightly lower than the upper sepal, thickish, subfal- 

 cately ovato-linear or oblong-linear, obtuse, 3-nerved, about 6-6^ mm. long. 

 Labellum lanceolato-ligulate, obtuse, entire, carnosulate, sub-5-nerved, about 

 10 mm. long, 3-3 J mm. wide at the base ; spur longer than the ovary, 

 elongate, narrow, falcate towards the apex, about 2^-3 cm. long. Column 

 short, broad, emarginato-bifid at the top; anther-cells remote, obovoid- 

 oblong ; rostellura broadly obtuse ; column-auricles ellipsoid. Ovary angus- 

 tate, arcuate, gradually attenuated above, about li cm. long, 



Nom. Jap. Hachijo-tsuresagi (nov.). 



Hah. IsL. Hachijo : Nishiyama {Sahuro Okuho ! herb, Sc. Coll, Imp. 

 Univ. Tokyo, May 13, 1887). 



This species is known only from Isl, Hachijo. It is allied to Platan- 

 thera japonica (Thunb.) Lindley, of which the tuber is horizontal, the 

 lower larger leaves more than two, the upper sepal subovato-elliptical and 

 much concave, the lateral sepals shorter and broader, and the base of the 

 anther-cells more produced ; the veinlets of leaves are also different. It 

 differs also from PlatantJiera chlorantlia Oust, in all the respects except the 

 bifolious habit. The nearest allied species seems to me to be Platanthera 

 orhiculata (Pursh) Lindl. of North America. 



Platanthera (Bifoliaa) ussuriensis (Kegel et Maack) Maxim, in 

 Mel. Biol. XII, p. 551 (1886) ; Kranzl. Orchid. Gen. et Sp. I. p. 629 ; 

 Rolfe in Journ. Linn. Soc. XXXVI. p. 57. 



Hahenaria itssuriensis Miyabe Fl. Kuril. Isl. n, 251. 



Platanthera tipuloides var. y. ussuriensis Hegel et IMaack, Tent. FI. 

 Ussur. n. 477, tab. 10, fig. 7-9 (pess.) ; Franch. et Sav. Enum. PI. Jap. 

 II. p. 32. 



Platanthera herhiola var. japonica A. Finet. in Bull. Soc. Bot. France, 

 XLVII. (1900) p. 281. 



A terrestrial orchid, 20-52 cm. in height, glabrous. Tuber slender, 

 root-like, horizontal or obliquely so ; roots few, simple. Stem erect, slender, 

 sheathing at the base. Leaves several, membranaceous ; lower 2 larger, 

 erect-patent, vaginate, remote or approximate one another, the lowest one 

 largest, oblanceolate to obovato-oblong, gradually cuneato-attenuated belowj 

 obtuse at the apex, delicately several-nerved on each side, with oblique 



