302 THE JOURNAL OF BOTANY 



at the same stage have narrow oval or elliptic nuts with no 

 acuminate beak. The spikes are lax, with the lower spikelets 

 remote, differing obviously from the Lochnagar plant in this ; and 

 as yet I believe C. approximata has not been found on the Breadal- 

 banes. — G. acuta x Hudsonii ? Specimens sent me by the Rev. 

 H. J. Riddelsdell from Crymlyn Bog, near Swansea, may be this, 

 unless it is merely 0. Hudsonii Ar. Benn. starved into sterility by 

 the poisonous fumes of chemical works. I also am inclined to 

 believe that a plant from which Mr. R. A. Phillips sent me 

 specimens labelled C. stricta from Castle Connell, Co. Limerick, 



is C. acuta x Hudsonii. — C. acuta x Goodenowii occurs just 



north of the railway, Christchurch, S. Hants, and at Wareham, 

 Dorset, and I have seen specimens from other localities ; Mr. 

 R. A. Phillips sent it me lately from Banagher, King's County. 

 G. trinervis, from Ormesby Common, Norfolk, E., was sterile in 

 its native locality and affected with Pnccinia, and continued so in 

 my garden. I have long entertained the suspicion that this plant 

 is not C. trinervis Degland, but G. Goodenowii x fiacca. — C. aqiiatiiis 

 X Hudsonii (C. hibernica Ar. Benn.). See Journ. Bot. 1897, p. 250. 

 C. aquatiiis x rigida, moorland near Clova, Forfar. — G. aquatiiis 

 X Kattegatensis var. salina {C. Grantii Ar. Benn., I.e. p. 250). — C. 

 aquatiiis x Goodenowii, known from Clova, Forfar, Caithness, and 

 Spittal of Glen Shee, E. Perth (B. E. C. Rpt. 1906, 246).— C. Good- 

 enowii x rigida has been gathered by Mr. Marshall from the White 

 Water, Forfar, 1904, and so named by Pfarrer Kiikenthal " in 

 spite of its apparent fertility,' 1 and also on Lochnagar, 1906; and 

 by myself and the Rev. W. R. Linton in Glen Doll, Forfar, 1890, 

 near the Dhu Loch, S. Aberdeen, 1889, and on Meall nan Tar- 

 machan, Mid-Perth, 1891. I agree with the naming of the first- 

 named gathering, but demur to the supposed fertility ; my speci- 

 mens show flat unfertilized nuts. — C. fulva Good, is stated to be a 

 hybrid of G.Jiava and C. Homschuchiana. Mr. Marshall reports 

 three hybrids of this group : C. lepidocarpa Tausch., G. (Ederi Retz. 

 and its var. ctdocarpa, each crossing with C. Homschuchiana, and 

 he considers the last to be the most frequent. — C. acutiformis x 

 riparia ought to occur frequently, if proximity of the parents 

 favoured union. But I have not seen or heard of it till the Rev. 

 H. J. Riddelsdell sent me specimens from Peterston, Glamorgan, 

 labelled C. riparia L., which 1 have no doubt are this hybrid. This 

 led me to recognize the same hybrid with much probability in 

 specimens I had laid in from Brandon, Norfolk, as G. acutiformis 

 Ehrh. var. — (7. acutiformis x rostrata — so I interpret a puzzling 

 plant gathered by Mr. C. Waterfall near Tewkesbury, Glos., in 

 1902, and labelled C. acuta L., which it somewhat resembled. 

 G. rostrata xvesicana is believed by Mr. Marshall to be the solution 

 of C. involuta Bab. ; and Messrs. Groves (Bab. Man. ed. ix.) allow 

 it as possibly correct. The form of the hybrid I have gathered at 

 Wareham, Dorset, is not identical, and seemed to me peculiar in 

 having its stigmas included ; it was, of course, sterile. Speci- 

 mens have been sent me as crosses between C.fiava aggreg, and 



