1908] Eggleston,— Crataegi 75 
there are hybrids in the genus, for plants are often encountered which 
have seemingly the wrong anther-color; thus Pruinosae and Tenui- 
foliae, which habitually have pink anthers, occasionally exhibit yellow 
anthers. In the North one would naturally investigate these as 
probable crosses with the Rotundifoliae, Intricatae, or Molles. The 
section Macracanthae is one of the most easily distinguished because 
the nutlets have pits on their inner faces, and naturally a hybrid 
between one of the Macracanthae and a species with plane nutlets 
would be marked. Опе would expect in such a form nutlets with 
pits of all degrees of depth, and forms of this sort are in fact often 
found in nature. 
One of the best places to study Crataegus hybrids is in the North- 
west, where there are only three groups represented, one with black 
fruit, the others with red. In this region forms with brown or chest- 
nut-colored fruit are found, but they are relatively so scarce as to 
suggest hybrid origin. 
Although anther-color seems to be of value in determining Crataegi, 
it is a distinction which cannot be used in the case of dried material, 
and even in the live plants it is of such short duration that I have left 
it out of my keys. 
Reliable characters are to be found in the fruits, number of nutlets, 
sculpture of the nutlets, and consistency of the flesh, whether hard or 
soft at maturity, and form of the calyx, while even the leaves and 
sepals are of more permanent aid to us than the color character. 
In sectional names the oldest known have been used. Fortunately 
only one section had to be renamed. For this I used the name of the 
oldest as well as the most characteristic species, as follows: 
Rotundifoliae, n. nom. Coccineae Sarg. Man. Trees N. A. 366 
(1905), not Loudon, Arb. et Frut. Brit. 2: 816 (1838). 
Other notes and nomenclatorial changes which it seems best to put 
on record together with synonymy and bibliography are as follows: 
C. Свов-влтлл L., var. exigua (Sarg.), n. comb. C. exigua Sarg. 
Rhod. 5: 52 (1903). 
C. CRUS-GALLI L., var. PRUNIFOLIA (Poir. Loud. Arb. et Frut. 
Brit. 2: 821 (1838). Mespilus prunifolia Poiret, Encyc. Method. 4: 
443 (1797) and in Nouveau Duhamel Traité des Arbres et Arbust. 
4: 150, t. 40 (1809). С. attenuata Ashe, Jour. Elisha Mitchell Soc. 
19: pt. 1, 30 (1903). This variety seems to have been subject to a 
mistaken interpretation, which needs revision. Poiret’s description 
