TERMS. 



Most of the terms used are those common to Botanical des- 

 criptions, but those referring to the venation may be so unfa- 

 miliar as to require definition. They are based on a most excel- 

 lent paper by Dr. Glatfelter (Rep. Mo. Bot. Gard 5:46-60. 1894.) 

 on the venation of the willows. 



Primary. A main vein branching directly from the midrib. 



Costal. A smaller vein from the midrib, of considerable 

 size but not reaching as far as the primaries. 



;ondary. A vein of the second order given off from a pri- 

 mary. 



Tertiary. A vein given off from a secondary. 



Arch. The joining near the margin of a primary with a 

 fork >cnt off from the one next above, the two branches together 

 forming the arch which rests upon the two primaries. 



/.(><>/>. Funned by a primary near the margin curving 

 yard and inward and merging into the next above, similar 

 to an arch but lacking the angle at the apex. 



Regular. Veins parallel. 



Bract. In his treatment of the genus in Britton's Manual 



Scale. I Mr. P. A. Rydberg ai >| dies the term bract to the 



rudimentary perianth of the flower, a small leaf subtending the 



ntial organs, whereas previous writers have termed this a 



scale ami reserved the former term tor the bracts which support 



aments. This departure from the accepted usi 'ins to 



confusing and unjustifiable as the departures from 



the rules of priority in nomenelature which the New York Botan- 



condemn so strongly. Further the meaning given the terms 

 in tin- glossary at the end of the book, accords better with the 

 older usage than with Rydberg's application of them. Th 

 definitions arc here- followed. According to Britton, a "Bra 

 is"Aleaf, usually small, subtending a (lower or a flower cluster 

 or a sporange. " That is, in this case one of the leaves which ap- 

 pear at the b >f the aments. And a "Scale" i< "A minute 

 rudimentary or vi leaf." In tin- case one of the small 

 leaves in the axils of which the flowers are b< rne To make the 

 matter worse, Rydberg uses bract in both ntroducing 

 ambiguity a) 



