20 KEY, BASED UPON FRUIT. 



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



at tip 100. PICEA ALBA. 



Pendent, 14-3 in. long, scales incisely-denticulate. 



149. PICEA SITCHENSIS. 

 / 4 . Cylindrical-oblong, 2-3 in. long; bracts much exserted. 



150. PSEUDOTSUGA TAXIFOLIA. 



/ 5 . Ovoid or roundish, small, 9 lines or less, scales persistent on the axis 



at maturity 23. LARIX AMERICANA. 



c? 2 . Scales few, persistent, bractless; cone 

 . Oblong and erect, with scales more or less thickened. 



Loosely imbricated, 8-12, thinnish 24. THUYA OCCIDENTALS. 



Valvate, 4-6, thick, only two scales fertile. 



141. LlBOCEDRUS DECURRENS. 



e 9 . Spherical, about in. in diameter, with 3 pairs of peltate scales. 



74. CHAMAECYPARIS THYOIDES. 



d?. 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 LUTE A. 



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



/*. Cones suberect, ovoid-oblong; scales thicker and with short divergent 

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

 f*. Cones pendent, cyclindrical and about 



I in. in length 70. B. POPULIFOLIA. 



I 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 ACUATINATA. 



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



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



C? 2 . Indehiscent at maturity and falling away as samara). 



2. LlRIODENDRON TULIPIFERA. 



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



60. LlQUIDAMBAR STYRACIFLUA. 



6 3 . Sorosis a spike with bracts and calyx-lobes all thickened and succulent. 



63. MORUS RUBRA. 



a 3 . A naked seed, subtended or surrounded by a fleshy disk. 



6. Drupe-like, with fleshy covering, sessile, scaly-bracted beneath and about 



1 in. in length, oval 120. TORREYA TAXIFOLIA. 



1$ in length, obovoid 145. TORREYA CALIFORNICA, 



b*. Bony seed, subtended by a fleshy cup 144 TAXUS BREVIFOLIA. 



