PHANEROGAMS— PROFESSOR BAYLEY BALFOUR. 285 



Order LXXII. ORCHIDE^. 



A very vast order largely represented in tropical regions, rarer in dry 

 districts. 



HABENARIA. 



Habenaria, Willd. Sp. PI. iv. 44 ; Benth. et Hook. Gen. PI. iii. 624. 



A vast and polymorphous genus widely dispersed over the temperate and 

 warmer regions of the globe. 



H. socotrana, Balf. fil. in Proc. Roy. Soc. Edin. xii. (1882), 96. Tab. 

 LXXXII, B. 



Glabra caule gracili ; foliis menibranaceis oblanceolatis v. oblongis ; racemis elongatis floribus 

 distantibus ; bracteis ovario brevioribus attenuato-acuminatis ; sepalis petalisque obtusis, 

 labello 3-partito lobis linearibus calcare gracillimo ovario longiore. 



Sesquipedalis glabra caule gracili erecto basi tuberosa. Folia plus minus basi rosulata v. per 

 partem infimam caulis approximatim disposita, lamina ssepe 5£ poll, longa 1 poll, lata sed 

 ad 1£ poll, longam et \ poll, latam varians oblanceolata v. longe oblongo-elliptica apice 

 acuta ssepe cuspidata basi gradatim attenuata margine integra v. obscure crenulata ; vagina 

 3^ poll, longa integra laxa. Folia bractealia cauliuia pauca remota lanceolata acuminata 

 amplexicaulia sed vix vaginantia. Bacemi sublaxi elongati ssepe f ped. longi, pedicelli 

 £ poll, longi ; bracteae oblongo-ellipticae acuminata^ ad medium ovarii attingentes. Sepala 

 intus glandulosa, posticum ellipticum obtusum subapiculatum concavum erectum 3-nervium 

 \ poll, longum i 1 ^ poll, latum ; lateralia ovata obtusa 1-nervia. Pctala lateralia oblonga 

 falcata apice venulis conjunctis 1-nervia intus glandulosa. Ldbellum alte trifidum 

 medio segmento \ poll, longiore lobis linearibus obtusis, calcare longissimo £ poll, longo 

 arcuato binervoso lineari acuto. Stigmatici appendices breves rotundatae. Capsula \—L 

 poll, longa. 



Socotra. On the hills near Galonsir. B.C.S. n. 315. Nimmo. 



Distrib. Endemic. 



A species having a close alliance with H. attenuata, Hook. f. (in Journ. Linn. 

 Soc. vii. (1864) 221), a plant of the Cameroon mountains at an elevation of over 

 7000 feet, but it is readily distinguished from it by the more delicate habit with 

 rosulate basal leaves, and the bracts of the racemes shorter than the ovaries. 

 Welwitsch's Angola plant described as II. Spiranthes by Keichenbach f. in Flora 

 1865, 178, is also not far removed. 



A small and new species which we only gathered in one spot on the island. 

 It is amongst the plants in Kew Herbarium from Nimmo. 



Order LXXIII. IBIDEM. 



An order widely dispersed over the old and new worlds, especially in tem- 

 perate regions, and having a great development in the Mediterranean region, 

 and south Africa. The two genera in Socotra are of much interest. One, 



