No. 56S] X CAP SELLA BURSA-PASTORIS ARACHNOIDEA 223 



It must be granted that the approximation is fairly 

 close, and that, taken in consideration with the others, it 

 offers ample support for the correctness of the diagnosis 

 of the zygotic constitution of the original plant. It at 

 least offers a working basis. One would be tempted to 

 accept it as a final solution were it not for the fortunate 

 appearance of a plant which does not fit into our scheme 

 and which, provisionally, has been named Caps ellaBursa- 

 pastoris orbicularis. 



Capsella Buksa-pastoris orbicularis 

 This form differs from any other plant encountered 

 in my cultures. While in a general manner resembling 

 simplex, it differs in being more robust, having larger 

 flowers (though not as large as those of C. grandifora), 

 and in having orbicular first 

 leaves (Fig. 13). All leaves 

 are covered with stout hairs. 

 It is a plant which tempts us 

 to draw a parallel between it 

 and (Enothera gig as, a name 

 which I have not used for the 

 sake of avoiding an implied 

 comparison. 



The first plant of this type appeared in a culture of 

 attenuata (26,012#i?3P5) and was of sufficiently striking 

 appearance, though but four or five leaves had developed, 

 to call for a special note and a photograph. Later the 

 plant was potted and finally seed was gathered from the 

 unguarded plant. From this seed four seedlings were 

 obtained. At least three of them closely resembled the 

 parent, the fourth having somewhat narrower leaves. 

 Later the differences between these plants and those of 

 simplex became more apparent (Fig. 14). Those of my 

 students to whom the differences have been pointed out 

 have not the slightest difficulty in distinguishing between 

 the two forms. It is hoped that later, when by means of 

 prolonged cultures I shall have made myself more familiar 

 with this form, it may be made the subject of a distinct 

 paper where histological and cytological studies will find 



