166 



OX SEEDLINGS 



suborbicular, entire, glabrous, very obscurely nerved, dark dull green 

 above, paler beneath. 



Stem. 1st internode 1-2 mm. long, and as thick ; 2nd-4th 



about 5 mm. long, ridged owing to the decurrent petioles of the 

 leaves. 



Leaves. No. 1. About I cm. long including petiole, 5 mm. 

 wide, elliptic, oblique, acute, slightly serrate, penninerved, glabrous 

 except a few hairs on lower side of the petiole and midrib, thin, 

 slender, dull green. 



Nos. 2-5. More deeply mucronate- serrate. 



Ultimate leaves simple, cauline, alternate, exstipulate, petiolate, 

 alternately incurvinerved, reticulate, glabrous or nearly so, simply 

 or doubly serrate. 



lobelia Erinns, L. (fig. 492). 



Primary root fibrous, slender, colourless. 



Hypocotyl 5 mm. long, 1 mm. thick, terete, slender, colourless. 

 Cotyledons 4 mm. long including the short petiole, 2-5 mm. 

 wide, ovate, slightly emarginate, cuneate 

 at base, glabrous and very obscurely 

 nerved, light green. 



Stem. 1st internode 5 mm. long, 

 1 mm. thick ; 2nd 1*5-2 cm. long, 

 slender, terete, glabrous, almost colour- 

 less. 



The two first leaves are like the coty- 

 ledons but larger; petiole, 1*5-2 cm. 

 long, -75 mm. wide, glabrous ; blade 

 1 cm. long, nearly as wide, entire. 



The second is often serrate-crenate 

 near the base, penninerved, with a few 

 hairs on the petiole. 



Ultimate leaves simple, cauline, 

 alternately penninerved, glabrous or 

 slightly hairy on the petiole, thin, 

 membranous, with milky juice, deep 

 green ; petiole slender, rather brittle. 



FIG. 492. Lobelia Erinut. 

 Nat. size. 



Lobelia tenuior, B. Br. 



Primary root as in L. Erinus. 

 Hypocotyl erect, terete, glabrous, purple above ground, colourless 

 beneath, 2-2-6 cm. long. 



Cotyledons ovate, obtuse, emarginate, glabrous, stained with 



