330 Rydberg: Notes on Rosaceae 



this seems only a slender form of A. parviflora, grown under 

 somewhat abnormal conditions. The specimens on which this 

 new species were based extend the range of A . parviflora to Santo 

 Domingo. 



Agrimonia incisa T. &. G. No new facts were added in 

 regard to this species in the North American Flora. 



ADENOSTOMA 



This genus has often been included in the Dryadeae, Sangui- 

 sorbeae, or Cercocarpeae. It could not very well be included in 

 either the Dryadeae or the Cercocarpeae, as the ovules and seeds 

 are inserted in the distal end of the ovary. It was placed in 

 Cercocarpeae on account of its solitary achenes, but there are 

 several other genera with solitary achenes that could not be placed 

 in that tribe. In the characters of the fruit and hypanthium, it 

 agrees best with the Sanguisorbeae, but the ovary is covered with 

 a cushion, under the margin of which the style is inserted on one 

 side and doubly bent; the species are shrubs of a peculiar habit 

 with small entire linear leaves. It is, therefore, best to regard 

 the genus as representing a distinct tribe. 



Adenostoma fasciculatum H. & A. This species is very variable, 

 and it is hard to decide if the next species should be merged in it 

 or not. The leaves are either short or long, but usually distinctly 

 petioled. The branches are glabrous or minutely puberulent, 

 and in such cases approach the next species. Adenostoma fas- 

 ciculatum densifolium Eastw. is in my opinion only a mere form 

 of this species with more crowded leaves and inflorescence. 



Adenostoma brevifolium Nutt. It was with some reluctance 

 that I took up Nuttall's view regarding this plant. Usually, 

 however, Nuttall had good reasons for his segregates, even if 

 Torrey and Gray reduced many of them. Whatever value this 

 plant may have as a species, the form is usually well marked by 

 its short obtuse, subsessile leaves, and pubescent branches. S. 

 Watson regarded it a variety of A. fasciculatum, and described 

 it as var. obtusifolium. C. K. Schneider reduces the latter to a 

 mere form, but describes a new variety under the name var. 

 hirsuta. Whatever Schneider might have had in mind when he 

 made the reduction, the fact is that his var. hirsuta is the same as 

 the original A. brevifolia of Nuttall. 



