1908] Eggleston,— Crataegi 83 
C. MACRACANTHA Lodd., var. neofluvialis (Ashe), n. comb. C. 
neo-fluvialis Ashe, Jour. Elisha Mitchell Soc. 16: pt. 2, 71 (1900). 
C. СнАрмАх: (Beadle) Ashe, var. Plukenetii, n. var. C. tomentosa 
. of the Linnaean herbarium and of authors, but not of the Linnaean 
description. С. leucophleos Moench, Verz. Ausl. Baeume, 31 (1785)? 
This thorn was one of the first raised in Great Britain, as is shown 
by its inclusion in such early works as the above mentioned Catalogus 
plantarum. ...quae in hortis non procul a Londino propagantur t. 
13, f. 2 (1730) and in Plukenet’s Phyt. t. 46, f. 1 (1691). 
Of the other two Linnaean species there can be no question, for 
C. Crus-galli L. rests оп Kalm's description and is also represented 
in the British Museum by Clayton's specimen; while C. viridis L. 
is represented in the British Museum by Clayton's specimen (type), 
though I know of no other specimen of C. viridis L. from Virginia. 
However, there is a specimen of C. viridis L. in the U. S. Nat. Herb. 
(no. 130624) from Chesapeake City, Maryland, І. Е. Ward. This 
Ward specimen I referred to C. Margaretta Ashe in Torreya 7: 154 
(1907); but a careful study of flowering material for a key has shown 
my mistaken identification. С. Margaretta has two or sometimes three 
styles, crenately lobed leaves, and numerous spines, while C. viridis 
has four or five styles, acutely lobed leaves, and very few or no spines. 
C. viridis, in flower, is much harder to distinguish from a form of 
C. Canbyi Sarg., namely the one called C. Pennypackeri Sarg.; the 
latter differing from C. viridis most obviously in its abundant thorns; 
and there is а possibility that this Ward specimen is C. Pennypackert 
without thorns. Our Washington and Baltimore botanists have an 
excellent opportunity both to investigate this Chesapeake City region, 
and also Clayton’s region about “Windsor” on the Plankatank, for 
the type location of C. viridis L. 
Much of my study of the genus Crataegus has been done in the 
herbarium of the New York Botanical Garden, where for some 
months I have been engaged in bringing together as complete a 
representation as possible of the group. I have also been greatly 
aided by facilities afforded me at the Gray Herbarium, and I owe 
much to the privilege of examining the excellent herbarium and live 
collections of the Arnold Arboretum. I am further indebted to the 
Missouri Botanical Garden for the loan of over three thousand sheets 
of the genus, to the United States National Museum, to the Phila- 
delphia Academy, to Prof. Aven Nelson, to President Ezra Brainerd 
