124 



ON SEEDLINGS 



scattered coarse hairs on the upper side, and with a spiny margin, 

 except the first one or two, glabrous on the under side, light green, 

 slightly fleshy, one-veined. 



The mode of germination closely resembles that of Eschscholtzia 

 tenuifolia. 



Argemone mexicana, L. (fig. 147). 



Primary root tapering, with numerous branching rootlets. 

 Hypocotyl undeveloped or subterranean and indistinguishable 



from the root. 



Cotyledons linear, en- 

 tire, acute, dilated and 

 connate at the base, 

 forming a cup round 

 the plumule, glabrous, 

 glaucous on both sur- 

 faces, without any dis- 

 cernible venation in the 

 fresh state, 16-20 mm. 

 long. 



Stem herbaceous, 

 annual, erect, developed 

 when about to flower ; 

 primary internodes un- 

 developed. 



Leaves simple, radi- 

 cal and cauline, alter- 

 nate, exstipulate, sessile, 

 alternately and ascend- 

 ingly penninerved, pin- 

 natifid, spiny, with thin 

 prickles on both surfaces, 

 otherwise glabrous, deep 

 glaucous - green above 

 with the midrib and 

 principal nerves splashed with white, much paler and uniformly 

 glaucous beneath, dilated and amplexicaul at the base. 



Nos. 1-2. Spathulate-cuneate, acutely dentate-serrate near the 

 apex. 



No. 8. Spathulate-cuneate, much larger than the first two, spiny- 

 serrate. 



Nos. 4-6. Obovate, pinnatifid or lobulate, undulate at the margin, 

 with the lobes and teeth tipped with spiny bristles. 



/ 



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FIG. 147. Argemtme mexicana. Nat. size. 



