298 The Ohio Naturalist. [Vol. V, No. 5, 



3. Terminal buds large, angular, more or less pointed, glabrous except at 

 the margins of the scales; bud scales very fleshy; twigs robust; not 

 red. 4. 



3. Terminal buds rather small, pointed or obtuse, pubescent, not very 



angular; scales dry or if rather fleshy then the twigs red or reddish; 

 twigs usvially slender. 5. 



4. Twigs slender, brownish or grayish, not glaucous; leaf scars meeting 



in a free point; buds large, fleshy, slightly greenish to dark red; 

 outer surface of 4-6 inner scales chestnut brown; cultivated. 



Acer platanoidcs L. Norway Maple. 



4. Twigs stout, greenish brown to gray, glavicous; leaf scars usually not 



contiguous; buds large, fleshy, green or slightly tinged with red; 

 outer surface of inner scales not chestnut brown; twigs with self- 

 prvming scars; cultivated. 



Acer pseudo-plataniis L. Sycamore I\Iaple. 



5. Twigs closely gray pubescent; buds small, evidently stalked; shrubs 



or rarely small trees. Acer spicatuni Lam. Mountain Maple. 

 5. Twigs glabrous; buds short-stalked or sessile; large trees. 6. 

 0. Buds rounded, robust, fleshy, reddish in color; visible scales 2-S; leaf 



scars rarely contiguous; twigs with self-pruning scars. 7. 

 G. Buds slender, pointed, dry, brownish to brownish gray, sometimes 



nearly black at tip; visible scales 6-16; leaf scars contiguous or 



nearly so; twigs without self-pruning scars. 8 

 7. Twigs glabrous, brownish to red; bark gray, falling away in large, thin 



flakes on old trees. Acer sacchariiiuin L. Silver Maple. 



7. Twigs glabrous, reddish to red ; bark light gray, rough on old trees, 



but not falling away in large pieces. Acer rubrtim L. Red Maple. 



8. Twigs reddish brown or buff, mostly glossy; buds conical, acute, gray, 



pubescent ; limb of leaf scars less prominent because of the absence 

 of stipules; ridge connecting leaf scars only slightly pubescent; 

 bark of trunk dark gray or gray, soinewhat spreading. 



Acer saccharum Marsh. Sugar IMaple. 

 8. Twigs greenish to gray bviff, dull; bvids ovoid, conical, often obtuse; 

 limb of leaf scars inore proininent because of the presence of 

 stipules; ridge connecting leaf scars prominently pubescent; 

 lenticels prominent and usually many; Ijark of trunk black, rather 

 close. Acer )u'gnijii Michx. Black Maple. 



THE CLASSIFICATION OF PLANTS, I. 



John H. Schaffner. 



It is the intention of the writer to give from time to time, for 

 the use of students, a series of notes on the classification of plants. 

 The disposition made of the plant kingdom will represent the 

 writer's own views although much has been borrowed from 

 various sources. 



The classification of the plant kingdom should be an expres- 

 sion of its evolutionary history so far as known or it should at 

 least be an attempt at such an expression. It should be based 

 on the doctrine of descent. A natural arrangement should take 

 account of the progressive advancement of ]jlants from the lowest 

 to the highest types as well as of the segregation of great branches 

 or groups and the origin of large numbers of species belonging to 

 the same general level. In other words, the scheme should 



