THE ROGUE WALLFLOWER 



265 



obtusis pubescentibus pbylla suboequantibus, receptaculi alveolis 

 ore pubescentibus, corollis tiavis ex involucro plane eminentibus 

 horum labio exteriori ovato-oblongo 3-clenticulato inteiioii alte 

 bipai'tito, acbyeniis linearibus basi leviter angustatis apice breviter 

 contractis papillosis, pappi setis copiosis 2-senatis scabriusculis 

 dilute stramineis. 



Hab. Valley between Pacasmayo and Eail-head, 7000 ft. 



Folia exempl. unici nobis obvii summum 3x1 cm., pleraque 

 equidem circa 20 x 5 mm., in sicco griseo-viridia ; costa media 

 supra plana, subtus maxime prominens ; petioli 4-5 mm. long. 

 Paniculae 2-5 x 2-5 cm. Pedunculi proprii saepius 2-4 mm. long., 

 pubescentes. Bracteae 6-7 mm. long. Involucri pbylla 7*5 mm. 

 long., 1'5 mm. lat., coriacea, margine membranacea, dilute griseo- 

 brunnea. Corollarum tubus anguste infundibularis, 7 mm. long. ; 

 labium exterius 4-4-5 x 2 mm. ; labium interius 3'5 x "4 mm. 

 Achaenia 5-6 mm., pappus 8 mm. long. 



Distinguishable at once from T. paradoxa DC. by means of 

 the small, narrow leaves and the short involucres. 



THE ROGUE WALLFLOWER. 



By F. J. Chittenden, F.L.S. 



[Reprinted by permission from the Journal of the Boyal 

 Horticultural Society, xl. 83-87 (August, 1914). In addition to 

 the papers cited, reference may be made to a note in this Journal 

 for 1882 (p. 282) by Robert Holland, and to a paper by Duchartre 

 — " sur une monstruosite de la fleur du vioHer {Cheiranthus 

 Chein) " in Ann. Sci. Nat. (Bot.) ser. 5, xiii. 315-339, t. 1.— Ed. 



JOURN. BOT.] 



From time to time there appears among wallflowers a rogue 

 form apparently without petals and looking at a cursory glance as 

 though the flowers had failed to open. This rogue form is not 

 confined to any one variety, but occurs in both yellows and reds. 



The form has been known for a long time and has even received 

 a botanical name, for A. P. de Candolle ''■'- describes it under the 

 name Cheiranthus Cheiri y gynantherus, with the following 

 diagnosis : " Antheris nempe in carpella mutatis." It appears to 

 arise suddenly from time to time, but, as the observations to be 

 described below show, it may possibly be that certain apparently 

 normal individuals among wallflowers are so constituted that their 

 seed necessarily produces both normal and rogue form. That is, 

 they may be hybrids in the Mendelian sense and, so to speak, 

 carry the characters of both normal and rogue forms. On the 

 other hand, we have no evidence to show that the rogues do not 

 arise suddenly as seminal sports. 



The malformation existing in the rogues is a very peculiar one, 

 in which both petals and stamens are involved. The petals are 



* DC. Prodromus, I. p. 135 (1S24). 



