NUTTALLIA DAVIDIANA. Ill 



but this is merely inferential. That author did indeed describe, 

 from insufUcient herbarium fragments, what he called " Exo- 

 chorda f Davidiana " (Adansonia, ix. 149), concerning which 

 he said, at a later date (1. c. xi. 338) that it ought to be referred 

 to NuttalUa ; that the seeds of the shrub as grown in the Paris 

 Garden, and which he had been told had come from Mongolia 

 through the hands of the Abbe David, had really been received 

 from the United States. 



Considering the shrnb to be a NuttalUa, it is evident M. 

 Baillpn did not believe it to be the one species up to that 

 time recognized, N. cerasiformis; and from the characters as- 

 signed the foliage it can not have been that ; for the leaves are 

 to be glabrous on both faces, and their margin crenulate. This 

 last character is one of a nature to throw doubt upon the cor- 

 rectness of referring the shrub to the North American genus ; 

 for the foliage of ours is entire, though with the exception that 

 in very young leaves of one of the newly proposed species, O. 

 demissa, the margin is narrowly revolute and crisped, even 

 appearing somewhat erose. The foliage in M. Baillon's type 

 fragments was that of the flowering period, consequently not 

 half grown. Very possibly, then, Nutiallia Davidiana of the 

 Kew Index and my O. demissa might be proven identical ; but 

 the evidence is wholly insufficient ; and so I declined, in my re- 

 cent paper, to cite the Kew Index name at all. 



Three New Heucheras 



H. PACHYPODA. Rhizome stout, subligneous, strongly inves- 

 ted by a coat of dead leaf -bases : leaves very small, in a compact 

 tuft, firm, more or less pubescent on both faces, suborbicular, 

 hardly i inch broad, the petioles about as long : slender wiry 

 scapes 6 or 8 inches high including the inflorescence, purple, 

 scaberulous and slightly glandular : panicle 3 to 5 inches long, 

 subracemose and more or less definitely unilateral, the few 

 flowered branches remote : calyx somewhat gibbously turbinate. 



