192 ORCHIL ACEM. [ PACHYSTOMA* 



P. senile, Reickb. /. in Bonpl. Hi, 251 ; F. B. I. v, 812 ; K & P. 

 IT* Ann. R. Bot. Gard. Calc viii, 101, t. 140 ; Duthie id. ix, pt. 2, 

 108 ; Prain Beng. PI. 1014. 



An erect terrestrial herb, leafless when in flower. Rhizome rather 

 stout, producing scapes and solitary leaves at intervals of about 2 in. 

 Leaf longer than the scapes, linear, membranous, 4-5-nerved. Scapes 

 about 12 in. high, clothed with many pale striate sheaths 1-2 in. long. 

 Racemes many-flowered. Flowers about \ in. across, greenish-white 

 tinged with pink or purple, gland-puberulous ; floral bract longer 

 than the curved stalked pubescent ovary, erect, lanceolate, acuminate. 

 Sepals unequal ; dorsal oblong, rounded at apex ; lateral pair spreading 

 oblong-lanceolate, subacute. Petals narrowly spathulate, re-curved 

 puberuJous as are the sepals. Lip sessile on the base of the column, 

 3-lobed, broadly oblong, gibbous at the base, pubescent ; side-lobes 

 acutely falcate ; terminal one suborbicular, recurved and abruptly 

 ' acuminate at the apex ; upper surface of disk with 5 stout crested 

 : ridges extending from base to apex. Column dilated upwards, 

 puberulous. Anther on the back of the column, indistinctly 8- 

 celled. 



Dehra Dun (T. Thomson, Mackinnon) ; also in many localities within 

 the area of this flora from the Jumna eastwards to Moradabad and 

 N. Oudh. Flowers in April. DISTRIB. : Outer Himalayan ranges 

 from Garhwal to Sikkim ; also on the Khasia Hills, and eastwards 

 to the Nicobar Islands, and the Malay Archipelago to S. China. It 

 occurs also in N. Bengal and Chota Nagpur and extends southwards 

 to S. India ^and Ceylon. 



8. THUNIA, Reichb. ; included under Phaius in Fl. Brit. Ind. 

 v, 816. 



Terrestrial, rarely epiphytic herbs. Stems slender or equally 

 thickened along their entire length, elongate, leafy, with many 

 foliaceous sheaths below. Leaves distichous, lanceolate, glaucous. 

 Flowers appearing with leaves, large, showy, in terminal drooping 

 racemes ; bracts large, scarious. Sepals erecto -patent, subequal, 

 lanceolate, acute. Petals like the sepals. Lip adnate to the base 

 of the footless column, shortly spurred ; side-lobes short, involving 

 the column ; mid-lobe fringed. Anther narrow, pendulous, incom- 

 pletely 4-celled ; pollinia 8, waxy, attached in fours to a granular 

 membrane ; rostellum 3-lobed. Species about 9, in tropical and 

 temperate regions of the OJd World. 



