246 OX SEEDLINGS 



cotyledons, while those of Sida fallax are larger, and those of 

 Hibiscus Trionum are inclined to be broadly ovate-elliptic. 

 The cotyledons of Adansonia digitata and A. Gregorii are 

 broadly oblong, obtuse, entire, slightly cordate at the base, 

 strongly five- to seven-nerved, somewhat concave and reticu- 

 late. Those of Paritium tortuosum are very much smaller 

 with inconspicuous venation. 



The transversely oblong type is represented by Gossypium 

 barbadense (fig. 215), in which the cotyledons are large, folia- 

 ceous, transversely oblong, retuse, sometimes broadly and 

 shallowly emarginate, strongly three- to five-nerved, and re- 

 ticulate. G. arboreum agrees, while G. tomentosum sometimes 

 differs in being more or less cuneate at the base. A curious 

 instance of dimorphism occurs in Hibiscus phoeniceus. One 

 form of seedling has the first four leaves oblong and tridentate 

 at the apex, followed by four larger and more oval ones. The 

 second form has the first leaf oblong and nearly entire, the 

 second trifid and trinerved, followed by six trinerved and tri- 

 partite ones. The leaves from the ninth to the sixteenth 

 inclusive vary with three, four, and five nerves and as many 

 segments, all of which are linear and entire. 



In Pachira aquatica the cotyledons are subterranean. 1 



Lavatera trimestris, L. 



Hypocotyl 12-13 mm. long, erect, terete, glabrous, light green 

 or colourless. 



Cotyledons cordate or ovate from a cordate base, unequal, emar- 

 ginate, obtuse, petiolate, glabrous, green, with a reddish spot near 

 the petiole, very distinctly five-nerved. 



Stem with primary internodes undeveloped. 



Urst leaves simple, or roundly reniform, obtuse, cordate at the 

 base, crenate, wrinkled, glabrous, green, pinnately trinerved, petio- 

 late, stipulate ; petioles stout, hairy, channelled on the upper side ; 

 stipules membranous, brownish, deciduous. 



Sidalcea malvaeflora, Lindley. 



Hypocotyl terete, glabrous, fleshy, deep red, 3-5 mm. long, 

 '5-1*5 mm. thick. 



Cotyledons opposite, foliaceous, cordate, entire, obtuse, glabrous ; 

 1 Lynch, Journ. Linn. Soc. 1878, p. 147. 



