1917] SHERFF—BIDENS 4I 
EXPLANATION OF PLATES IX AND X 
PLATE IX 
Bidens squarrosa H.B.K.: a, fruiting spray Xo.75; 6, exterior bract X 4; 
c, interior bract X3; d, ligulate floret <3; e, palea X4.5; a disk floret X 4.5; 
g, achene X4.5; all from type in Herb. Mus. Hist. Nat. Paris 
PLATE X 
»Bidens squarrosa H.B.K. (B. antiguensis Coult.): a, portion of branch Xo.7; 
a* and k, small portions of 2 plants showing comparative pubescence Xo.7; 
6 and /, exterior bracts 4; ¢ and m, interior bracts X4; d and , ligulate 
florets X4; e, palea X4; f and o, disk florets <4; g, anthers X35; h, pollen 
grain X 1000; 7, style branches X20; 7, achene <6; a from first type sheet 
and k-o from second type sheet of Bidens antiguensis (both J. D. Smith 2354 
in Herb. Univ. Chicago). 
