Description of Foreign Trees 
20. European Linden. (Tilia europza.) 
LeaF: 3'-4', as in American species (‘‘ Native Trees,” 20), but 
not so cordate and oblique at base. FLOWER: as in American 
species, but with xo petal-like scale in front of petal as in our own 
species. 
21. English Elm. (Ulmus campestris.) 
LEAF: 2’-4', simple, alternate, serrate, oval to obovate, pointed, 
mostly smooth ; fruit deeply notched at apex ; branches horizontal 
or upward slanting. 
22. Scotch or Wych Elm. (Ulmus montana.) 
LEAF: 2'-5', simple, alternate, serrate, roughish, buds not 
downy ; calyx, lobes and stamens about 5 ; fruit 1’ long, smooth. 
23. Small-leaved Elm. (Ulmus parvifolia.) 
LEAF: less than 1’, simple, alternate, serrate, elliptical, al- 
most leathery; blossoms in May and June with leaves; fruit 
ovate, not hairy, apex notched; bark loosening in thick layers. 
China, 
24. Long-stemmed Mountain Elm. (Ulmus effusa.) 
LEAF: 2'-4', simple, alternate, serrate, elliptical, base tapering, 
very one-sided, pointed, smooth above, long-stemmed ; blossoms 
early, before leaves ; fruit hairy-edged. 
25. Willow. (Salix pentandra.) 
LEAF: 3-4, simple, alternate, serrate, ovate-elliptical, short- 
pointed, bright green beneath, many glands on stem; like laurel 
leaf ; flowersin May. Europe. 
26. Lance-leaved Willow. (Salix lancifolia.) 
LEAF : 3-4’, simple, alternate, finely but sharply serrate, oblong- 
lance-shaped, hairy both sides when mature; flowers before 
leaves. Germany. 
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