172 



IP s t e I s i a 



median resin duct close to the hypoderm. Stam- 

 inate flower axillary or terminal, subglobose with 

 an elongated drooping pedicel; stamens short- 

 stalked, globose; anther sacs opening trans- 

 versely, surmounted by a short gland-like skin; 

 pollen grains with bladder-like appendages. 

 Pistillate flower sessile, terminal at the end of a 

 short, leafy branchlet, the bracts exceeding the 

 broad scales. Fruit a woody, pendulous or 

 erect cone; cone-scales much larger than the 

 bracts, jjersistent after the fall of the seeds; 

 seeds furnished with resin vesicles. 



This subgenus includes only the following 

 species which is often included under Tsitga, 

 from which it differs in the form and structure 

 of the leaves, the pollen grains with bladder- 

 like api)endages, and the long bracts of the 

 pistillate flower. 



Abies Mcrtcnsiana (Bongard) Lindley and 

 Gordon, Journ. Hort. Soc. Lond. 5:211.1850. 



^Abies Pattoniana Jeffrey ex A.Murray. 1853.] 



\Tsuga Mertensiana (Bongard) Sargent]. 



[Tsiiga Pattoniana (Jeffery) Seneclauze]. 



Mountain Hemlock. Patton Spruce. 



