KEY, BASED UPON FRUIT. 19 



/ 3 . Cylindric, 4-6 in. long, scales thin and unarmed 49. P. STROBUS. 



C 2 . Maturing the first season the autumn after blossoming. 

 f. Ovoid or oblong, \ in. long, pendent ; bracts inconspicuous ; scales per- 

 sistent on the axis, thin and with eroded tip 20. ABIES NIGRA. 



/" 2 . Ovoid, small (8 lines or less), pendent, scales rounded and entire at tip. 



21. ABIES CANADENSIS. 



Cyclindrical, 



Erect, large (2-4 in.), and scales finally falling away from the axis. 



22. ABIES BALSAMEA. 

 Nodding, small (about 2 in.) scales persisting on the axis. 



100. PlCEA ALBA. 



/ 4 . Ovoid or roundish, small, 9 lines or less, scales persistent on the axis 



at maturity 23. LARIX AMERICANA. 



(P. Scales few, persistent, bractless; cone 



Oblong and erect, with loosely imbricated scales somewhat thickened at 



the tip, seeds winged all round 27. THUYA OCCIDENT ALIS. 



Spherical, about in. in diameter, with 3 pairs of peltate scales. 



74. CHAMAECYPARIS THYOIDES. 



d 3 . Scales not spreading at maturity, but breaking irregularly; cones globose. 



119. TAXODIUM DISTICHUM. 



C 2 . Scales 3 -lobed bracts each subtending 2-3 closed, indehiscent carpels minia- 

 ture samarae (Betula). 

 /. Cones erect, 



Sessile, ovoid-oblong, 1 in. in length 17. BETULA LUTEA. 



With downy peduncle, ovoid, smaller 95. BETULA NIGRA. 



f 1 . Cones suberect, ovoid-oblong; scales thicker and with short divergent 



lobes: wing of nutlet not broader than the body 44. B. LENTA. 



/ 3 . Cones pendent, cyclindrical and about 



1 in. in length 70. B. POPULIFOLIA. 



1 in. in length 43. B. PAPYRACEA. 



c 3 . Scales closed carpels, growing from an elongated receptacle and consolidated 



together. 



d. Dehiscent at maturity along the medium line of the back, and letting out 

 each 1-2 berry-like seeds suspended by extensile threads (Magnolia)', 

 cone 



Cyclindrical, curved, 2-3 in. long 1. MAGNOLIA ACUMINATA. 



Oblong, 1-1| in. long 51. MAGNOLIA GLAUCA. 



Oval, 3-4 in. long 101. MAGNOLIA GRANDIFLORA. 



(V. Indehiscent at maturity and falling away as samarae. 



2. LlRIODENDRON TULIPIFERA. 



6 2 . Spherical head, hardened and bristling with 2-beaked capsules. 



60. LlQUIDAMBAR STYRACIFLUA. 



b 3 . Sorosis a spike with bracts and calyx-lobes all thickened and succulent. 



63. MORUS RUBRA 



