274 THE JOURNAL OF BOTANY 



records G. boreale x verum. I see no reference to fruit in the brief 

 descriptions. 



Composite. — Erigeron acer X canadensis, reported by Rev. E. S. 

 Marshall (p. 164), does not appear to be known for France, but is 

 given by Focke for several places in East Germany. — Senecio vul- 

 garis x squalidus is perfectly fertile, and has become something of 

 a weed in the Cambridge Botanic Garden ; so I learn from Mr, 

 R. I. Lynch, who adds that he believes S. albescens ($• cineraria x 

 Jacobcea, see Joum. Bot. 1902, 401) to be also quite fertile. — Carduus 

 crispus x nutans (C. Newbouldi H. C. Watson), occurring here and 

 there with the parents, is sterile in my experience. — Cnicus palustris 

 X pratensis (C. Forsteri Sm.) was sterile in Westmeath. — C. hetero- 

 phyllus X palustris (C. Wankelli Reich.) is given by Nyman for 

 Saxony, Bohemia, &c. ; and as C. Carolorum Jenner by Dr. Focke 

 for England, E. Germany, Styria, Bohemia, and Russia. — C. 

 acaulis x arvensis (C. Clarkei H. C. Watson) and C. acaidis X pra- 

 tensis (C. Woodivardii H. C. Watson) are recorded as British. 



Hieracium in the London Catalogue has two hybrids indicated in 

 the usual way, viz., H. anglicum x hypochceroides and H. boreale x 

 sciaphilum. Of the latter I know nothing, but understood that it 

 was found growing with the supposed parents, and judged by Mr. 

 F. J. Hanbury to be a hybrid. The former (teste W. R. Linton) 

 cultivation has proved to be a mistake, and it has been named 

 H. hypocharoides Gibs. var. land folium W. R. Linton. The Rev. 

 A. Ley writes to me that he has found undoubted wild H. corym- 

 bosum x boreale, and one or two hybrids have come up in his 



Hawkweed garden spontaneously; but I have no particulars of 

 these. Under cultivation Mendel and Schultes have raised hybrids 

 in this genus; but neither the Rev. W. R. Linton, nor Rev. E. S. 

 Marshall, nor Mr. F. J. Hanbury, nor myself, who have all culti- 

 vated large numbers of different species in close proximity at the 

 same time, have been able to detect any hybrid among the 

 numerous seedlings which were allowed to flower ; we are none of 

 us opposed to the theory of hybridity accounting for the multitu- 

 dinous forms, if the evidence prove favourable ; but in our several 

 experience the supporting evidence has not been forthcoming. 



Ericaceae. — Vaccinium Myrtillus X Vitisldcea (F. intermedium 



Ruthe) I believe has not been reported from any but the original 

 station. 



■ 



Erica cilians x Tetralix (E. Watsoni Bentham). I did not 

 examine this plant for fruit when I had it, but assumed its sterility 

 (perhaps too readily) ; it produced no seedlings during the years it 

 was in cultivation with me, and in a native station near Parkstone, 

 Dorset, I observed the plants of the hybrid continuing to flower 

 some time after E. ciliaris had entirely ceased ; E. Tetralix had 

 stopped still earlier. E. Mackaii is, says Focke (/-. c, p. 232), 

 11 evidently a hybrid of E. Tetralix L. ; the other parent is pro- 

 bably E. cinerea L. (or E. mediterranea L., or E. ciliaris L.?)." I 



do not think, nor does Mr. Marshall, that anybody who has 

 gathered E. Mackaii, or seen it fresh gathered, as I have done, 

 would agree that any of these suggestions hits the mark. 



