NOTES ON NEW AND OLD GENERA 1 83 



Saccharodendron hispidum (Schwerin) Nwd. 



Acer hispidum Gr. von Schwerin, Nutt. Deutsch. Dendr. 

 Gesell, p. 77, (1894). 



Saccharodendron grandidentatum (Nutt.) Nwd. 



Acer grandidentatum Nuttall in Torrey and Grav Fl. N. Am. 

 I., p. 247, (1838). 



Section or Subgenus Sacchrosphendamnus . 



Flowers notably precocious, appearing long before the leaves. 

 Stamens in the staminate flowers' hypogynous. Plants andro- 

 dioicous. Inflorescence lateral. (Habit different from the rest 

 and perhaps a good genus, Sacchrosphendamnus.) 



Saccharodendron saccharinum (Linn.) Nwd. 

 Acer saccharinum Linn. Sp. PI. p. 1055, (1753). 



[Sachrosphendamnus saccharinum (Linn.).] 



The silver maple, Saccharodendron saccharinum (Linn.) Nwd. 

 {Acer saccharinum Linn.) by habit and in very important other 

 characters seems different enough to form a good subgenus or 

 genus and in many cases differences such as here found would 

 seem sufflcient for generic distinction. The plants here included 

 in Saccharodendron, however, will be seen to be very conspicu- 

 ously and sufflciently different from the other maples to merit 

 segregation. The calyx segments are not only united but the lobes 

 are in all cases shorter than the tube in contradistinction to the 

 almost distinct if not entirely distinct sepals of Acer. Petals are 

 totally absent. The stamens are situated on the interior margin 

 of the disk. The plants are andro-monoicous (and andro-diocous 

 in 5. saccharinum.) These characters alone would seem to indicate 

 that the genus segregated herewith deserves as much if not more 

 right to be accepted thaji Rulac. One would suppose that the 

 latter should be reduced if Saccharodendron seems inadmissable. 

 This latter differs by as great distinctions from the other maples 

 as well as from Rulac and stands out markedly besides by it syn- 

 sepalous calyx. Perhaps for consistency's sake still other segre- 

 gation would be desirable but such notable characters as have 

 been discussed can scarcely be overlooked for generic standing 

 of any plants when these marks are constant. 



CiRCAEA IN A Separate Family. 

 Apart from the fact that the habit of Circaea is different from 



