1918] SARGENT—CARYA 243 
only at the apex or splits to the base; it is puberulous and, like 
the involucre of the pistillate flower, is covered more or less thickly 
with yellow scales, which are usually found also on the lower surface 
. of the 5 or more commonly 7 leaflets. The different forms of these 
trees intergrade, and it would be possible to consider them forms of 
one species; but as the trees with close bark usually produce pear- 
shaped fruits which remain closed or open tardily to the middle, 
and generally by only 1 or 2 sutures, and as the trees with scaly 
bark bear fruit which, although round or pear-shaped on different 
forms, always splits freely to the base, it seems convenient to group 
these different forms under two species, chiefly distinguished by the 
indehiscent or dehiscent involucre of the fruit. The earliest post- 
Linnaean name for any of these trees is Juglans glabra of MILLER, 
published in the eighth edition of his Dictionary in 1768. MILLER’s 
species is based on CLayton’s Juglans alba fructu minori, cortice 
glabro. Trees with close bark and indehiscent pear-shaped fruit 
and trees with slightly scaly bark and globose dehiscent fruit are 
common in Gloucester County, Virginia, where CLAYTON lived for 
many years and where he probably made most of his observations 
on trees, but the “cortice glabro”’ seems to point to the tree with 
close bark and pear-shaped indehiscent fruit. If this view is cor- 
rect and the trees with indehiscent fruit are treated as representa- 
tives of a distinct species, this becomes 
Carya glabra Sweet, Hort. Brit. 97. 1827; Torrey, Fl. N.Y. 2:182 
(in part). pl. ror. 
Juglans glabra Miller, Dict. ed. 8, no. 5. 1768. 
Jugians porcina Michaux f., Hist. Arb. Am. Sept. 1:206 (in 
part). pl. 38. figs. 1, 2. 1910. 
Carya porcina Nuttall, Gen. 2:222 (in part); Sargent, Trees and 
Shrubs 2:199. pl. 179. 1913. 
The fruit of this tree is obovoid, compressed, rounded at apex, gradually 
narrowed below and often abruptly contracted into a short stipelike base; the 
involucre is 1.5-2.5 mm. in thickness and opens tardily generally by 1 or 2 
sutures, or often remains closed. The nut is compressed, obovoid, slightly 
obonedate or acute at apex, gradually narrowed at base, not ridged, and light 
colored with a hard thick shell and small sweet seed. The leaves are usually 5-, 
tarely 7-foliolate, and more or less thickly covered with yellow scales. The 
ark is close and shows no tendency to become flaky. This is one of the least 
