COMPOSITE 121 



echinulate on the back, flattened and slightly convex on the face, 

 minutely reticulate, 1*5-2 mm. long, '75-1 mm. wide, '25--33 mm. 

 thick. 



C. Atkinsoniana, Dougl. Receptacle elevated, 2-5-6'75 mm. 

 in diameter, bearing eighty to one hundred and thirty-six achenes, 

 of which fifty to ninety-four ripened in specimens examined. 

 Achene almost semiglobose, concave on the ventral aspect, 

 echinulate dorsally, 2-2-25 mm. long, 1-5-1-75 mm. wide, '5-1 mm. 

 thick. 



C. bicolor, Rchb. Receptacle convex, 3-5-6 mm. in diameter, 

 bearing one hundred and eighty to two hundred and sixteen 

 achenes, of which one hundred to one hundred and sixty ripened 

 in the specimens examined. Achene 2-2-33 mm. long, '75-1 mm. 

 wide, -25 mm. thick, oblong, slightly curved longitudinally, and 

 generally tapering slightly to the ends, with a small white basal 

 callosity, minutely echinulate on both surfaces. 



Dahlia variabilis, Desf. 



Achene narrowly obovate or spathulate, notched at the apex 

 with a little tooth in the sinus, giving the whole a tridentate 

 appearance, compressed, obtusely ancipitous, disarticulated at the 

 base transversely, with a shallow oval areola, black. 



Seed conforming to the interior of the fruit, but readily separ- 

 able from it ; testa thin, pale or colourless, longitudinally striate. 



Endosperm absent. 



Embryo straight, occupying and conforming to the interior of 

 the seed, fleshy, colourless ; cotyledons spathulate, obtuse, entire, 

 tapering gradually to the short radicle, plano-convex and applied to 

 each other, face to face ; radicle inferior, obtusely pointed, close to 

 the hilum. 



Seedling. 



Primary root long, tapering, with lateral rootlets, ultimately 

 supplanted by more or less fusiform tubers springing from below the 

 cotyledons, and in close proximity to them. 



Hypocotyl subterranean or indistinguishable from the root. 



Cotyledons spathulate-linear. 



Stem erect, terete, herbaceous, hairy, ultimately glabrous or 

 thinly hairy, greenish -purple, striated with darker lines ; 1st inter- 

 node 14 mm. long ; 2nd 4 mm. ; 3rd 2-5 mm. ; 4th 5 mm. 



Leaves opposite, pinnatisect, glabrous above except on the nerves, 

 deep green, ciliate at the margins, paler beneath and hairy ; petioles 

 channelled on the upper side, and more or less winged. 



