118 



ON SEEDLINGS 



petiole, glabrous, pale green, more or less stained with purple, some- 

 what unequal in size owing to their position in the curved seed and 

 fruit. In twelve out of fifteen seedlings the cotyledons were 

 markedly unequal ; in the other three only slightly. 



Coreopsis auriculata, L. (fig. 462). 



Achene obovate, winged, wings nearly entire or oftener more 

 or less cut into shreds or short filaments, convex on the dorsal 

 aspect and somewhat curved, subconcave when dry and curved 

 longitudinally on the ventral aspect, with a callosity at its base 

 and a large one at the apex, or two more or less combined, 

 smooth on the dorsal aspect, minutely tuberculated on the ventral, 

 black. 



FIG. 462. Coreopsis auriculata. A, longitudinal section of achene, x 14 : 

 r, radicle. B, transverse section of achene, x 14. 



Seed conforming in outline to the cavity of the achene, rounded 

 at the end, suddenly tapered to an obtuse point, much compressed 

 dorso-ventrally, surrounded by a dark line on the middle of both 

 dorsal and ventral aspect, slightly curved longitudinally like the 

 achene ; hilum basal ; chalaza apical ; testa thin, pale, membra- 

 nous. 



Endosperm absent. * 



Embryo large, slightly curved in accordance with the achene and 

 seed, colourless ; cotyledons obovate or broadly oval, rounded at the 

 apex, entire, suddenly narrowed to the radicle ; radicle very short, 

 obtuse. 



