154 



ON SEEDLINGS 



Centaurea Clementei, Boiss. (fig. 482). 



Primary root pale yellowish, stout or fleshy, tapering, with short 

 stout lateral rootlets. 



Hypocotyl stout, glabrous, cylindrical, red above ground and 

 yellowish beneath, 1-8 cm. long, 2-25 mm. thick. 



Cotyledons foliaceous, spathulate, obtuse, entire, tapering into 

 the petiole which is dilated and connate with the other one at the 

 base, 3-9 cm. long including the petiole, 1-1 cm. wide near the top, 

 pale green, glabrous. 



' 



FIG. 482. Centaurea Clementei. 

 Half nat. size. 



Stem herbaceous, 

 elongating when about 

 to flower. 



Leaves radical and 

 ultimately also cauline, 

 alternate, whitish and 

 cottony on both sides, 

 especially when young; 

 petioles slightly chan- 

 nelled on the upper side, 

 dilated and sheathing at 

 the base. 



No. 1. Spathulate, 

 acute, entire. 



No. 2. Ovate, sub- 

 acute, unequally dentate -serrate (deformed in specimen described). 



No. 3. Oblong- elliptic in outline, acute, pinnatifid ; lower seg- 

 ments small, usually unequal ; middle segments larger, ovate, 

 acute, with a strong nerve running into them ; terminal seg- 

 ment much the largest, oblong-ovate, trinerved, more or less 

 serrate. 



No. 4. Similar but more deeply cut. 



Centaurea ragnsina, L. 



Hypocotyl 8-14 mm. long, 1-1-5 mm. thick, pale green, almost 

 wiry in texture. 



Cotyledons as in C. Clementei. 



Stem herbaceous, very short. 



Leaves radical and cauline, alternate, petiolate. 



No. 1. Spathulate, obLuse or apiculate, entire, thinly tomentose 

 on both sides, pale green or nearly colourless, thick and soft ; petiole 

 4 mm. long, slightly channelled above. 



No. 2. Similar, whiter and more tomentose. 



Succeeding forms are gradually larger, spathulate, entire or 



