62 



MAGNOLIACEAE. 



LIRIODENDRON. Tulip Tree. 

 (Family Magnoliaceae). 



Large trees: deciduous. Twigs 

 aromatic, moderate, terete: wood 

 green: pith rounded, pale, con- 

 tinuous, with firmer diaphragms 

 at short intervals. Buds solitary 

 or superposed, the lateral or lower 

 small, rounded and sessile or in- 

 distinct, the terminal larger, ob- 

 long and somewhat stalked, com- 

 pressed or 2-edged, with 2 valvate 

 scales. Leaf-scars alternate, rather 

 large, round, low: bundle-traces a 

 dozen or more in an irregular 

 ellipse or scattered: stipule-scars 

 linear, encircling the twig. Fruit, 

 in the form of cone-like aggre- 

 gates, is often present in winter. 

 The bark of Liriodendron is 

 strikingly different from that of 

 any other common tree in being 

 longitudinally fissured with con- 

 necting cross- strands, so as to suggest a series of parallel 

 mountain ridges with deep gullies in their sides. The flat- 

 tened winter buds are favorite objects for easy dissection. 

 Each is enclosed by a pair of scales representing the stipules 

 of the lowermost leaf of the next year: these separate easily 

 at their edges and when removed reveal the leaf. The process 

 may be continued several times. At the center, if the bud 

 be a flower-bud, rudiments of this organ are to be seen in a 

 fair stage of development. References under Schizandra. 

 Glabrous: twigs and buds glossy red- or purplish-brown. 



L. Tulipifera. 



