336 THE JOURNAL OF BOTANY 



and bright blue flowers resemble this form, but are quite fertile. 

 Other plants with a habit approaching that of S. officinale and 

 with bright blue flowers are probably very near to S. co&ruleum, 

 but have not been seen in fruit. 



X S. coeruleum is the only form of S. officinale x peregrimi^m 

 which I have as yet recognized in the herbaria which I have 

 examined, and even that occurs more rarely than might be ex- 

 pected. The specimens which I have seen are labelled as folio w^s : — ■ 



" S. acutum. In h. Genev. cult. Juin, 1850, Huet de Pavilion." 

 Conservatoire Botanique, Geneve. 



" S. officinale v. patens. Telford, Surrey, E. S. Marshall." 

 Herb. Mus. Brit. 



''S. patens Sibth." Aalen, Wiirtemberg, 1909, Braun." Herb. 

 G. Bichnell (Bordighera). 



" S. peregrinum. Selkirk, July, 1910." Herb. G. C. Druce. 



While S. peregrinum produces fruit abundantly, S. officinale, 

 even when growing alone, and without any suspicion of hybridity, 

 is often quite sterile. In the case of the hybrids above described 

 some plants are sterile, while others produce • fruit sparingly — 

 never in such abundance as S. peregrimim. In the Oakford Valley 

 a careful search in a large patch of x S. discolor failed to reveal 

 a single nutlet, while on the Land Yeo the same plant produced 

 them in fair number. In the case of x S. densiflorum, one group 

 of plants was completely barren, while others bore a small quantity 

 of w^ell- developed fruit. It is possible that there are other hybrids 

 between S. officinale and S. peregrinum, w^iich cannot be included 

 with either of those described in this paper. I have, indeed, 

 gathered a single specimen of a form which appears to be nearer 

 to S. officinale a ocliroleucum than any of these, but more material 

 and further observation are necessary before deciding whether this 

 is worthy to be described as a distinct form. 



In order to comply with the Vienna Eules, a description in 

 Latin of the new hybrids is appended : — 



X S. DiscoLOE mihi. [S. officinale a ocliroleucum x < peregri- 

 num.) Planta parce fertilis vel sterilis. Caule l'5-2 m. alto, ramoso, 

 setis interdum in tuberculis insidentibus aspero ; foliis puberulis 

 setosisque, inferioribus ovatis, basi rotundatis in petiolum decur- 

 rentibus, superioribus lanceolatis, acuminatis, a basi dilatata 

 decurrentibus ; racemis brevibus, post anthesin paulo elongatis ; 

 calyce hispido ad tertiam partem inferiorem in laciniis lanceolatis 

 acutis acuminatisve diviso ; fructifero subsetoso ; corolla tubuloso- 

 infundibuliformi, ventricosa, albida aut colore dilute roseo coeru- 

 leove tincta, sicca caesia, in lobis ovatis apicibus interdum flavidis 

 subreflexis fissa, calycem duplo triplove excedente ; fornicibus 

 subulatis obtusiusculis ; antheris filamentis paulo longioribus ; 

 stylo vix exserto infra apicem inflexo ; nuculis inter illas parentium 



* There is no doubt that the name of patetis has often been applied to 

 S. peregrmnm and its hybrids. In Journ. Bot. 1900, p. 279, Mr. J. W. White 

 points out that the figure t. 1516 in Eng. Bot. ed. iii. does not represent 

 Sibtliorp's S. patens. It does, in fact, represent either S. peregrinum, or the 

 blue-flo^Yered hybrid, S. coeruleum. 



