ERICACEAE 



171 



Erica Tetralix, L. 



Hypocotyl erect, terete, filiform, glabrous, reddish, 8 mm. long. 



Cotyledons minute, oval, obtuse, glabrous ; lamina 1*25 mm. long, 

 1 mm. wide ; petiole '5 mm. long. 



Stem erect, filiform, ultimately woody, finely pubescent ; 1st 

 mternode undeveloped ; 2nd 3'5 mm. long ; 3rd 4*5 mm. ; 4th 4 mm. ; 

 5th 3 mm. ; 6th 3 mm. The plant was raised in heat ; probably the 

 internodes would be much shorter if raised in the open air. 



Leaves entire, verticillate, shortly petiolate, glabrous in the 

 seedling stage and frequently aristate, ciliate on the lateral nerves 

 in the adult plant, not on the revolute margins, flat in the seedling 

 stage and strongly revolute 

 at the margins in the adult 

 plant, deep green above, glau- 

 cous beneath, convex above 

 in the adult, concave beneath ; 

 petioles about 1 mm. long, 

 channelled above, ciliate at 

 the margins. 



First pair of leaves oppo- 



/s^r^r*^ , 



P 



site, obtuse. 



Second to fifth nodes 

 with the leaves verticillate in 

 threes, and ovate, subacute. 



Then in the seedling 

 noted, five scattered, ovate, 

 aristate leaves occurred ; 

 then two nodes each with 

 four verticillate leaves. 



Ultimate leaves verticil- 

 late with four in a whorl, 

 oblong - ovate, obtuse, tri- 

 nerved, ciliate on the lateral 

 nerves and strongly revolute 

 at the edges. 



Khododendron arboreum, 



Sm. (fig. 494). 



Primary root slender, 

 wiry, with numerous lateral rootlets, flexuose. 



Hypocotyl short, erect, terete, glabrous, about 3 mm. long. 



Cotyledons small, oval, obtuse, pubescent above, 8 mm. long in- 

 cluding the short petiole, 2 mm. wide. 



FIG. 494. Rhododendron arboreum. 

 Nat. size. 



