po s t e I s ia 



207 



morphous, four-ranked, those of the 

 upper and lower ranks almost flat, 

 those of the lateral ranks abruptly fold- 

 ed over the others. 



Thuja p. 191. and Cupressiis (Sect. 



ChamcEcyparis) p. 197. 



Note on the Taxonomy of the genus Abies. 



The genus Abies as here defined has the 



limits assigned to it by Tournefort * and 



Adanson. f 



Table II. shows seventeen of the chief points 

 of disagreement between species of this genus 

 and the occurrence of these characters in those 

 sections of the genus which contain any American 

 species. Below is given a summary of the num- 

 ber of these points in which species of the same 

 or different sections agree with one another. 



Picea. 



Hesper- 

 opeuce. 



Tsuga. 



Pseudo- 

 tsuga. 



Eu-Abies. 



Picea 



Hesperopeuce 



Tsuga 



Pseudotsuga. . 

 Eu-Abies .... 



..14-17 

 .7^-" 



•■55^-7 



16-17 

 11-13 



3%~m 



5-9^ 

 11-13 



15-17 

 7^-101.^ 



5^^-7 



16-17 

 6-13 



6-13 

 10—17 



* Tournefort. Institutiones. 585. pi. 353,354. 1700. 



t Adanson, Fam. PI. 2:480. 1763. 



X The agreement of a constant character with an individually in- 



