170 ON SEEDLINGS 



dendron arboreum are small, oval and pubescent. The two 

 primary leaves are also oval, but several times larger. The 

 ultimate ones are oblong-lanceolate, entire, and attain a length 

 of six to nine inches. The genus Erica is represented by E. 

 Tetralix which has minute oval cotyledons, and always very 

 small leaves. In a seedling observed the first pair of leaves 

 were opposite, followed by four whorls of three each, above 

 which were a few scattered ones, those again followed by whorls 

 of four leaves each as in the adult plant. In the seedling 

 they are flat, in the adult strongly revolute at the margins. 



A curious type occurs in Enkianthus japonicus, the coty- 

 ledons of which are oblong-ovate and crenulate, as in Ptelea 

 trifoliata amongst the Eutaceae. The first four leaves are 

 elliptic and serrulate. Another unusual form occurs in 

 Clethra arborea which has relatively large and broadly oblong- 

 ovate, slightly emarginate cotyledons. They are finely pube- 

 scent, as are the first pair of coarsely serrated leaves. 



Enkianthus japonicus, Hook. 



Hypocotyl erect, terete, pale green, ultimately glabrous, 8*5 mm. 

 above the soil. 



Cotyledons oblong-ovate, obtuse, minutely mucronate, alter- 

 nately penninerved, shallowly crenate, glabrous, shining on both 

 surfaces, bright green above, paler beneath ; lamina 8'5 mm. long, 

 5 mm. wide; petiole flattened above, 1 mm. long. 



Stem woody, erect, terete, with short decurrent wings from the 

 base and under side of the petioles, pubescent ; 1st and 2nd inter- 

 nodes undeveloped ; 3rd -5 mm. ; 4th 2-5 mm. ; 5th 3 mm. ; 6th 

 2-25 mm. ; 7th 3 mm. ; 8th 1-5 mm. ; 9th 1-75 mm. ; 10th 1 mm. 



Leaves simple, cauline, alternate, exstipulate, petiolate, ciliate- 

 serrulate, pubescent above, hairs with short fleshy bases and hooked 

 tips, ultimately glabrous or pubescent on the midrib, paler beneath 

 and pubescent on the principal nerves only, and slightly woolly near 

 the base, alternately penninerved with ascending subincurved nerves ; 

 petioles deeply channelled above, subcarinate, pubescent with hairs 

 on the margins and carina like those of the lamina. 



Nos. 1-4. Elliptic, acute, serrulate or ciliate-serrulate. 



Nos. 5-19. Lanceolate-elliptic, acute, ciliate-serrulate. 



Ultimate leaves obovate, apiculate, tapering much to the base, 

 ciliate-serrulate with the hairs booked forwards as in the coty- 

 ledons. 



