NUTTALLIA DAVIDIANA. 11] 
but this is merely inferential. That author did indeed describe, 
from insufficient herbarium fragments, what he called “ Æxo- 
chorda ? Davidiana” (Adansonia, ix. 149), concerning which 
he said, at a later date (l. c. xi. 328) that it ought to be referred 
to Nuttallia ; that the seeds of the shrub as grown in the Paris 
Garden, and which he had been told had come from Mongolia 
Oesch the hands of the Abbé David, had really been received 
from the United States. 
Considering the shrub to bea Wuttallia, it is evident M. 
Baillon did not believe it to be the one species up to that 
time recognized, A. 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 cf 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, Mut/allia 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. pacHypopa. 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 4 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, 
