259 



the tops of high bluffs along streams or on the slopes of deep ravines. 

 It is an infrequent to a common tree where found. In general in the 

 counties just mentioned it supplants the other species of Tilia. It was 

 reported from Wayne County by Phinney, and Schneck says a single 

 tree was found near the mouth of White River. The last named tree 

 may be Tilia neglecta which is said to be found just west in Illinois. 



Remarks. Wood and uses similar to that of the preceding species. 

 In Indiana the species are not commercially separated. 



A satisfactory division of the species of Tilia of the United States has 

 long been a puzzle. C. S. Sargent 1 has recently published his studies 

 of the species and credits Indiana with two species and one variety. 

 His range of Tilia neglecta might include a part of Indiana, and it may 

 be that the pubescent forms of Tilia glabra in our area should be referred 

 to that species. Specimens No. 28043 and 28047 in the writer's her- 

 barium collected from trees on the high bluff of Graham Creek in Jen- 

 nings County, Sargent refers to Tilia heterophylla variety Michauxii 

 Sargent. While Sargent's key to Tilia quite distinctly separates the 

 species and varieties, yet when specimens are collected from an area where 

 the species overlap and seem to intergrade, the task of referring a 

 specimen to the proper species or variety is not an easy one. In fact 

 the writer acknowledges his inability to satisfactorily classify our forms 

 of Tilia, and the present arrangement should be accepted as provisional. 



CORNACEAE. THE DOGWOOD FAMILY. 



Trees or shrubs; leaves simple, alternate, opposite or whorled; fruit 

 mostly a drupe, 1 or 2 seeded. 



Leaves alternate; flowers of two kinds, the staminate in heads, 



5-parted; stigmas lateral 1 Nyssa. 



Leaves opposite; flowers perfect, 4-parted; stigmas terminal. . 2 Cornus. 



1. NYSSA. THE TUPELOS. 



Nyssa sylvatica Marshall. GUM. BLACK GUM. SOUR GUM. 

 YELLOW GUM. PEPPERIDGE. Plate 120. Medium to large sized 

 trees; bark on old trees deeply and irregularly furrowed, the ridges 

 broken up into small lengths; twigs at first pubescent, becoming gla- 

 brous; leaves oval-obovate or oblong, blades 5-12 cm. long on petioles 

 0.5-2 cm. long, rather abruptly acuminate at apex, narrowed at the 

 base, sometimes rounded, margins entire, petioles and both surfaces 

 pubescent when they unfold, becoming glabrous above and glabrous or 



iSargent: Notes on North American Trees. Bot. Gaz. Vol. 66:421-438 and 494-511 

 1918. 



