Nineteenth Annual Meeting. lOl 



28. Lvs. with very large sinuate teeth; fr. an acorn 33 (Quercus.) 



28. Lvs., etc., not as above (29). 

 29. Lvs. smooth and shining above, serrate, with incurved teeth ; raceme of white 



fls. in May 17 (Prunus.) 



29. Lvs., etc., not as above (30). 



30. Lvs. rhombic-ovate, whitish beneath, twigs reddish, bark brownish, some- 

 what laminate 36 (Betula.) 



30. Lvs., etc., not as above (31). 



81. Bark smooth, close, gray; fr. a nut, with halberd-lobed bracts 35 (Carplnus.) 



31. Bark, etc., not as above (32). 



32. Bark brownish, furrowed, with fine, narrow longitudinal divisions ; fr. 



hop-like 34 (Ostrya.) 



32. Bark coarse, branches sometimes corky-winged ; fr. a drupe or samara (33). 



33. Veins from the midrib straight and parallel, veinle/s obscure; fr. a samara 26 (Ulmus.) 



33. Veins from the midrib irregular; veinlels prominent ; fr. a small drupe 27 (Celtis.) 



34. Lvs. subentire or serrate; fr. a pod (35). 



34. Lvs. palmately lobed; fr. a samara 10 (Acer.) 



35. Lvs. oval-oblong, serrate, 2'-5' long, pod deeply lobed, crimson 6 (Euonymus.) 



35. Lvs. cordate, subentire, often verticillate, 1° long, pod long cylindric 24 (Catalpa.) 



36. Lvs. palmately compound, Ifts. .5-7 8 (^Esculus.) 



36. Lvs. ternate, pinnate, or bi-pinnate (37). 

 .37. Trunk or branches armed with spines, thorns or prickles (38). 

 37. Trunk and branches unarmed (40). 



38. Lfts. 4-5 pairs; bark, lvs. and fleshy pod very pungent and aromatic 3 (Zanthoxylum.) 



88. Lfts. 6-12 pairs; bark, etc. not pungent or aromatic (39). 

 .39. Lfts. lanceolate-oblong ; thorns stout, often triple ; pods 12'-18' long, often twisted, 15 (Gleditschia.) 



.39. Lfts. ovate or oblong; branches armed with stipular prickles: pods 4'-6' long 13 (Robinia.) 



40. Lvs. bi-pinnate, l°-3° long; pod 6'-10' long; bean hard, brown, smooth 14 (Gymnocladus.) 



40. Lvs. pinnate or ternate; fr. a samara or nut (41). 

 41. Lvs. opposite (42). 

 41. Lvs. alternate (43). 



42. Lfts. 3-5; wood light, soft; twigs light green; fr. a double samara 11 (Negundo.) 



42. Lfts 5-9; wood heavy, tough ; bark furrowed; fr. a samara 23 (Fraxinus.) 



43. Lfts. 3; fr. winged; tree small 4 (Ptelea.) 



43. Lfts. 5-many (44). 



44. Tree small ; fr. a small, dry drupe or a berry (45). 



44. Tree large; bark rough; fr. a walnut or hickory -nut (46). 



45. Lvs. odd-pinnate; fr. a small, dry drupe, red or whitish 12 (Rhus.) 



45. Lvs. abruptly pinnate; fr. a single or triple berry 9 (Sapindus.) 



46. Buds superposed, uppermost far above the axil; pithinplates; fr.awalnut,31 (Juglans.) 



46. Buds scaly, axillary ; pith continuous; fr. a hickory-nut 32 (Carya.) 



47. Lvs. needle-shaped, 3'-5' long, 2 or 3 in a fascicle; fr. a cone 40 (Pinus.) 



47. Lvs. scale-shape, acute; fr. a bluish berry 39 (Juniperus.) 



LIST OF TREES. 

 ( Order Anonacese.) 



1. ASIMINA. PaPAW. 



.•1. triloba, Dunal; Papaw. A small tree; wood light, soft, yellowish-green; lvs. 

 8^-12^ long, at first rusty downy, soon glabrous; fls. in early spring, dull purple; 

 fr. 3^-4'' long, ripe in autumn. 



(Order Tiliacese.) 

 2. TiLiA. Basswood. 

 T. Americana, L.; Basswood, American Linden. A large tree, with light, soft wood; 

 inner bark very strong; lvs. smooth and green on both sides, serrate, often 

 truncate at base. The cluster of fragrant fls. with a peduncle that is a leaf- 

 like bract. 



( Order Rutace<e.) 



3. Zanthoxylum. Peicklt Ash. 

 Z. Americanum, Miller; Prickly Ash. A small tree, often reduced to a shrub; 



