i 9 2o] ' SHERFF—BIDENS 109 



Bidens linearif olia (O. and H.) , comb. nov. — Coreopsis linearif olia 

 Oliver and Hiern, FL Afr. Trop. 3:390. 1877; Bidens Schweinfurthii 

 Sherff, Bot. Gaz. 59-3°9- I9J5- — In 1915, on finding it necessary 

 to transfer this species from Coreopsis to Bidens, I purposely 

 created the new name Bidens Schweinfurthii "to avoid any possible 

 confusion with Bidens linearif olia Schz. Bip." (Bot. Gaz. 59:309). 

 This appeared to me to be much the most desirable procedure. 

 Nevertheless, in view of the fact that Bidens linearif olia Schz. Bip. 

 is not a true Bidens, but is rather a species of Cosmos (C. linearif olius 

 Hemsley, Biol. Centr. Amer. 2:200. 1881), the International Rules 

 require the retention of Oliver and Hiern's trivial name. 



University of Chicago 



EXPLANATION OF PLATES XI-XIV 



PLATE XI 



i 



a, an entire plant 



X0.64; a', fruiting head Xo. 64; b, b', exterior involucral bracts X 5; c,interior 

 involucral bract X5; d, palea X5; e, disk floret X5; /, /', outer and inner 

 achenes X 5 ; g, branch and portion of main stem Xo .64; h, exterior involucral 



ligul 



-f, from type 



type 



PLATE XII 



Bidens asplenioides (a-f) and B. Stokesii (g-o): a, branch X0.61; b, 

 exterior involucral bract X6; c, interior involucral bract X6; d, ovary X6; 

 e and/, fragments of mature achenes X6; g-i, branch and additional leaves 

 X0.61; /, exterior involucral bract X6; k, interior involucral bract X6; 

 I, ligulate floret X6; m, palea X6; n, disk floret X6; 0, achene X6; a-f, 

 from type of B. asplenioides, g-o, from type of B. Stokesii, both in Herb. Bishop 

 Mus. 



PLATE XIII 



Bidens gracilis (a-i) and B. cuneata (j-p) : a, branch Xo . 71 ; b, leaf Xo . 71 ; 

 c, exterior involucral bract X7; d y interior involucral bract X7; e y ligulate 

 floret X7; /, palea X7; g, disk floret X7; h and i, achenes X7; /, branch 

 and two old peduncles, apparently of previous season's growth X0.71; k, 

 exterior involucral bract X5; /, interior involucral bract X5; **> ligulate 

 floret X5; n, palea X5; 0, disk floret X5; ^ ? achene X5; a, c-i, from Mann 

 • and Brigham 98, Herb. Bishop Mus.; b, illustrating trifoliate leaf, from Forbes 

 1184O. Herb. Bishop Mus.; j-p, from type of B. cuneata, Herb. Bishop Mus. 



PLATE XIV 



Bidens Forbesii: a, upper portion of plant X0.61; b, leaf from sterile 

 branch X0.61; c, exterior involucral bract X6; d, interior involucral bract 

 X6; e, ligulate floret X6; /, palea X6; g, disk floret X6; h, very young 

 achene X6; L mature achene X6; a, c-i, from first type sheet, b, from second 

 type sheet in Herb. Bishop Mus. 



