x. 



69 



Varieties. Those which we shall give as such are described in the Flora of 

 Torrey and Gray as species ; but with the following remark, which we think 

 fully justifies us in not considering them more specifically distinct than the 

 different alleged species of the European lime. " There is great uncertainty 

 respecting the synonymes. Indeed, nearly all the characters which have 

 been employed for distinguishing them are either inconstant, or are common 

 to them all. A careful examination of the flowers in the living plants may 

 afford more certain marks of discrimination." 



t T. a. 2 heterophylla. T. heterophylla Vent., Pursh, Dec. Prod., Tor. 

 % Gray. A tree of 30 ft. to 50 ft. high, found on the banks of the 

 Ohio and Mississippi, and introduced in 181 1. Leaves glabrous and 

 deep green above, very white and velvety tomentose beneath ; the 

 veins dark-coloured, and nearly glabrous, with coarse mucronate ser- 

 ratures. Petals obtuse, crenulate. Staminodia spatulate, entire. 

 Style hairy at the base. (Tor. and Gray, i. p. 240.) Leaves 4 in. 

 to 8 in. in diameter, very oblique, and more or less cordate, with a 

 short abrupt acumination ; somewhat shining above : the veins on 

 the under surface very conspicuous, in contrast with the white pu- 

 bescence. Cyme few-flowered, loose. Style longer than the petals. 



T. a. 3 alba. T. alba Michx., Tor. $ Gray ; T. laxiflora Pursh. (The 

 plate of this tree in Arb. Brit., 1st ed., vol. v. ; and our fig. 103.; A 



103. Tilia americkna Alba. 



large tree in Pennsylvania and Maryland. Height 30 ft. to 50 ft. 

 Introduced in 1820. Flowers yellowish white, very pale ; June. 

 Leaves 3 in. to 4 in. in diameter, with a short abrup't acumination, 

 cordate, somewhat unequal at the base ; the under surface rather 

 thinly pubescent, very pale, but scarcely white. Staminodia (scales) 

 two thirds the length of the petals. Filaments slightly pentadel- 

 phous. (Tor. and Gray, i. p. 240.) We have only seen this tree in 

 the H. S., where, 10 years planted, it was about 10ft. high in 1837. 

 T. a. 4 pubescens. T. pubescens Ait., Vent., Tor. $ Gray. (The plate 

 of this tree in Arb. Brit., 1st ed., vol. v. ; and wirfig. 104.) A large 

 tree found in Carolina and Florida, along the sea coast. Height 

 50ft. to 70 ft. Introduced in 1726. Flowers pale yellow ; June. 

 Leaves 3 in. to 4 in. in diameter ; the under surface, when young, 

 rather paler than the upper, but at length nearly the same colour ; 

 serratures broad and short. (Tor. and Gray, i. p. 240.) 

 F 3 



