1913-14.] BOTANICAL SOCIETY OF EDINBURGH 223 



Chinglebraes, Saint Ola, Mainland, but it has been lono- 

 extinct there through the land on which it grew ha vino- 

 been cultivated. Dr. James Grant informs me that the 

 Juniper grows at Mousland, Stromness, Mainland ; and Mr. 

 Robert C. Tait also told me that he has seen a few more 

 plants of this species growing on other parts of the hills 

 in Stromness parish. 



Class II. — Monocotyledons. 



Orchis incarnata, Linn. — Bogg} T ground near the 

 Dwarfie Stane, Hoy, 7th July 1877, H. H. Johnston ( ride 

 J. T. I. B. Boswell) ; pasture, Bay of Islands, Loch of 

 Harray, Stenness, Mainland, 26th June 1883, H. H. John- 

 ston (fide J. T. I. B. Boswell ; sepals and petals white, 

 see " Annals Scot. Nat. Hist.," July 1895, p. 180) ; and rare 

 in a marsh 60 feet above sea-level, Kirbister, Orphir. 

 Mainland, 2nd July 1912, H. H. Johnston (stem hollow, 

 sepals and petals pink and marked with dark crimson lines 

 and spots). Native at all these stations. See " Journ. Bot.," 

 vol. xxxix., August 1901, p. 272; and Bennett, "Suppl. 

 Top. Bot., ed. ii.," 1905, p. 79. 



Potamogeton natans, Linn, {fide Arthur Bennett). 



P. heterophyllus, Schreb. (fide Arthur Bennett). 



P. perfoliatus, Linn., var. cordato - lanceolatus, 

 Mert. et Koch (fide Arthur Bennett; leaves li to 3 inches 

 long). 



P. pectinatus, Linn, (fide Arthur Bennett). — These 

 four native species of Potamogeton were growing in mud 

 at the bottom of water, 4 to 6 feet deep, in a loch 51 feet 

 above sea-level, Loch of Boardhouse, Birsay, Mainland, 29th 

 September 1913, H. H Johnston ; and they are all remark- 

 able in having neither flowers nor fruit on them, although 

 in the same loch, at the same time, in water 5 feet deep, 

 Myriophyllum spicatum, Linn, (fide Arthur Bennett), was 

 flowering and fruiting copiously. Specimens of P. natans, 

 Linn., neither in flower nor fruit, were also collected from 

 the Loch of Boardhouse, in July 1885, by Mr. W. A. Irvine 

 Fortescue, and on 9th September 1885 by H. H. Johnston: 

 and these specimens were identified as " P. polygoni- 

 folius, Pour-r., var." by the late Dr. J. T. I. B. Boswell, 

 but Mr. Arthur Bennett, in the " Bot. Exch. Club Report," 



TRANS. BOT. SOC. EDIX. VOL. XXVI. 1 7 



