i64 IP s t e I s i a 



B. Twigs with or without sterigmata, leaves flat, 



petioled, furnished with lateral resin ducts, 

 cones axillary, pendulous, cone-scales per- 

 sistent, shorter than the bracts. Pseudolsuga 



C. Twigs without sterigmata, marked with cir- 



cular leaf scars, cones axillary, erect, cone- 

 scales deciduous from the persistent axis. 



Eu- Abies 

 Section i. Picca. Link. Abhand. Akad. Berlin. 

 179.1827. 1830. as genus. Spruce. 

 Leaves quadrangular or flattened, seldom 

 twisted so as to appear two-ranked; leaf bases 

 becoming woody and persistent as prominent 

 sterigmata; resin ducts of leaves lateral, two or 

 sometimes only one or none; leaves stomatiferous 

 on all four sides, or in species with flat leaves 

 mainly on the morphologically upper side. 

 Flowers terminal, or in the axils of the upper 

 leaves of the growth of the previous year. Stam- 

 inate flower with a short, or occasionally a long 

 slender pedicel; anther sacs opening longitudin- 

 ally, surmounted by an orbicular toothed crest; 

 pollen grains with bladder-like appendages. 

 Pistillate flower erect, short-stalked, with bracts 



