26 BOTANICAL MAGAZINE. LVoi. xix, 



10-20 cm. long, 3-5 era. broad, approximate, erect-patent, elliptical to nar- 

 rowly oblong, obtuse at the base, obtusely to narrowly attenuated and 

 amplexicaul at the base, evaginate, membranaceous, 7-8-nerved on each 

 side ; transverse veinlets oblique and loose, with a few simple or 2-3-: 

 forked erect branches on the upper side ; upper leaves laxly disposed, ad- 

 pressed or erect-patent, lanceolate, attenuated above with an obtuse point ; 

 semiamplexicaul, evaginate, 2-6 cm. long, the lowest one sometimes attain- 

 ing about 12 cm. long. Raceme erect, densely or rather densely many- 

 flowered, 5-10 cm. long, 3-4 cm. wide ; rachis straight ; bracts erect-patent, 

 foliaceous, lanceolate to ovato-lanceolate, acuminate with an obtuse point, 

 equal to or slightly longer than ovaries, membranaceous, 3- several-nerved, 

 with loosely anastomosing veinlets, attaining about 2J cm. long. Flower 

 viridescent white ? Sepals membranaceous ; the upper one erect, ovate or 

 subdeltoid-ovate, obtuse, sub-5-nerved, 6-8 mm. long, 4-6 mm. wide ; 

 lateral ones patent-reflexed, 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^ 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 ; rostellum broadly obtuse ; column-auricles ellipsoid. Ovary angus- 

 tate, arcuate, gradually attenuated above, about 1£ cm. long. 



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



Hob. Isl. Hachijo : Nishiyama (Saburo Okubo ! 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 Platanthera chlorantha Oust, in all the respects except the 

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

 orbiculata (Pursh) Lindl. of North America. 



Platanthera (Bifoliae) ussuriensis (Regel et Maack) Maxim, in 



