HELLEBORINE VIRIDIFLORA IN BRITAIN 343 



side of the nodes, usually in pairs, and just behind the point of 

 origin of a leaf. There is nothing in their appearance, structure, 

 or mode of origin which calls for comment. 



Explanation of Plate 528 a. 



Fig. 1. Agropyrum repens L. (nat. size), rk = rootstock; r = root; a = 

 sclerotic apex; l'..l" scale leaves ; s = erect shoot. Fig. 2. Longitudinal 

 section, growing apex, x 4, semidiagramatic, showing growing apex (a) and 

 successive leaves (l-l 5 ). Fig. 3. 1-8 successive sections taken at the levels 

 indicated in fig. 2, 1-8. Fig. 4. Transverse section of stem internode. v.b. = 

 vascular bundle ; x = xylem ; p = phloem; e = endodermis; s = sclerenchyma. 

 Fig. 5. Longitudinal section, showing several successive leaves and the growing 

 apex (a), a = apex ; l 1 l a l 3 l 4 = successive leaves ; v. b. = vascular bundle ; 

 t. b. = tracheal bed ; h = hairs ; s = sclerenchyma ( x 450). Fig. 6. Longitudinal 

 section of vascular bundle, snowing px = protoxylem ; x = xylem ; s = pitted 

 sclerenchyma (x 450). Fig. 7. Leaf apex, showing arrangement of bands of 

 sclerenchyma (x 4). Fig. 8. Epidermis of leaf showing alternate long and 

 short cells whence barb hairs arise. Fig. 9. Longitudinal section of outer 

 layers of leaf showing sclerenchyma and barb hairs. Fig. 10. Transverse 

 section of leaf showing vascular bundle and sclerenchyma (x 450). 



HELLEBORINE VIRIDIFLORA IN BRITAIN. 

 By J. A. Wheldon, F.L.S., and W. G. Travis. 



On p. 307 we announced the discovery of Helleborine viridi- 

 flora (Epipactis viridiflora Reichb.) on the Lancashire coast, and 

 are now in a position to give further particulars of this addition 

 to the British Flora. 



In the field-work which is being undertaken in connection 

 with the preparation of a Flora of South Lancashire, we have 

 devoted much attention to the study of the sand-dune flora ; and, 

 during the past summer more especially, considerable attention 

 has been paid to the orchids, a dozen species of which are recorded 

 in the local lists as occurring on the sandhills of the South 

 Lancashire coast. 



An orchid which seemed particularly to call for critical 

 examination was a plant hitherto referred by local botanists 

 to Helleborine latifolia Druce. We had long thought it differed 

 considerably in appearance from the inland plant in some not 

 readily definable way, but until last summer had never compared 

 fresh examples of H. latifolia with the dune plant, or made a 

 critical examination of the latter. This comparison of flowering 

 specimens was rendered a matter of some difficulty by the fact 

 that, when the coast plant was in flower, the inland plant was only 

 in bud, and, by the time the flowers of the latter were sufficiently 

 developed, we found it difficult to get flowering examples of the 

 coast plant, and had to pay several visits to different localities 

 before securing a few belated blooms. 



The result of our comparisons led us to the conclusion that 

 the dune plant was certainly not ordinary H. latifolia, and, in 

 fact, it did not seem to agree with anything described in British 



2 d 2 



