356 ON SEEDLINGS 



late ones, and those by at least nine others which are linear- 

 lanceolate, very narrow, and of great length. 



The third group or type of cotyledons is met with in 

 ^Esculus Hippocastamim. The large fleshy cotyledons are 

 petiolate, but do not leave the seed ; and the latter is carried 

 some considerable height above ground during germination 

 owing to the great length of the hypocotyl. The case is quite 

 unusual, because in the majority of seedlings, where the 

 cotyledons do not leave the testa, the hypocotyl remains un- 

 developed. The first pair of leaves is compound and digit- 

 ately five-foliolate. This high development may be due to the 

 amount of reserve in the fleshy cotyledons ; and the elonga- 

 tion of the hypocotyl is necessary to carry the true leaves up 

 to the light, because the primary ones are not reduced to scales, 

 as most frequently occurs where the cotyledons are fleshy 

 and do not leave the testa. The opposite leaves of ^Esculus, 

 Acer, and Negundo are quite unusual in the Order. 



Blepharocarya involucrigera, F. Muell. 



Hypocotyl erect, terete, glabrous, green, soon becoming woody, 

 brown, and covered with pale brown lenticels, 1-5-2-8 cm. above the 

 soil. 



Cotyledons subovate, obtuse, falcate, somewhat unequally and 

 sballowly cordate at tbe base, slightly cut away on one side and 

 witb a shallow sinus about tbe middle of tbe otber, obscurely, but 

 quite evidently alternately incurvinerved and reticulate, glabrous, 

 deep green above, paler beneatb, petiolate ; lamina 1-3-1-5 cm. long, 

 7-8'25 mm. wide near tbe base ; petiole slender, semiterete, chan- 

 nelled above, glabrous, or nearly so, sb'ghtly connate at tbe base in 

 tbe early stages, about 1-5-2 mm. long. 



Stem erect, terete, covered witb a silky, adpressed, persistent 

 pubescence, pale green, soon becoming brown, woody, and covered 

 witb small, pale brown, elevated lenticels ; first twelve internodes 

 varying from 3-8 mm. long, increasing in length upwards. 



Leaves compound, imparipinnate (first seven or eight simple 

 and entire), cauline, alternate, exstipulate, petiolate, glabrous except 

 tbe petioles and petiolules, coriaceous, deep shining green above, 

 paler beneatb and shining ; leaflets lanceolate, acuminate, rounded 

 or suddenly and slightly tapering at tbe very base, alternately in- 

 curvinerved and reticulate with the lateral nerves slightly ascend- 

 ing, incurved, branched, and anastomosing near tbeir summit 



