140 ON SEEDLINGS 



Ultimate leaves oblong or oblong-elliptic, unequally dentate or 

 frequently lobulate, fleshy, alternately penninerved, glabrous or 

 slightly woolly at the margin, with long petioles. 



Senecio tetranthus, DC. 



Hypocotyl erect, becoming stouter upwards, glabrous, almost 

 colourless or reddish, 5-7 mm. long. 



Cotyledons oval, obtuse, entire, generally tipped with a small 

 mucro, glabrous, with a barely discernible midrib seen only by 

 transmitted light ; lamina 5-6 mm. long, 3'25-4'25 mm. wide ; 

 petiole flat above or slightly grooved, convex on the back, 4-6 mm. 

 long. 



Leaves simple, radical and cauline, alternately and ascendingly 

 penninerved, hairy all over, light green ; petiole semiterete, chan- 

 nelled above, coarsely hairy all over with many-jointed, whitish 

 hairs, dilated and clasping at the base. 



No. 1. Broadly ovate, cuspidately subacute, with a few glandular- 

 mucronate teeth on each side, and alternate, bent or wavy nerves 

 not running directly into the teeth. 



Senecio vulgaris, L. 



Primary root normal with numerous lateral rootlets. 



Hypocotyl erect, terete, succulent, deep purple and shining, about 

 8 mm. long. 



Cotyledons oblong- spathulate, obtuse, entire, tipped with a glan- 

 dular mucro, trinerved, with the lateral nerves parallel with, and 

 close to the margin, incurved and uniting with the midrib close to 

 the apex ; midrib giving off lateral, alternate short branches ascend- 

 ing irregularly, and forming a series of reticulations with the 

 lateral nerves. The stomata are about equal in number on both 

 surfaces, and the epidermal cells very wavy in outline. At the very 

 tip of the cotyledon and at its apical edge are some large open pores 

 in the glandular mucro. There are no openings on the upper or 

 under surface corresponding to those close to the apex in Galium 

 Aparine and Lithospermum officinale. 



Stem herbaceous, annual, fleshy, erect, terete at the base, angled 

 and furrowed upwards, sparsely hairy or woolly when young, 

 ultimately almost or quite glabrous ; 1st internode 4 mm. long ; 

 2nd 2 mm. ; 3rd 10 mm. ; 4th undeveloped ; 5th 8 mm. ; 6th 

 5 mm. 



Leaves cauline, lower petiolate, upper sessile, woolly or hairy at 

 the base on both sides when young like the buds, ultimately 

 glabrous or nearly so, deep green above, paler or subglaucous 



