224 ASHE: TREES AND SHRUBS OF WASHINGTON 
ifera. Leaves ovate, elliptic or orbicular, 2.2-4.5 cm. long by 2- 
3.1 cm. wide, obtuse or rounded and abruptly acute at the apex, 
rounded or subcordate at the base, finely and sharply serrate above 
the middle with acute, ascending teeth, densely white-tomentose 
beneath when young but soon becoming glabrous on both sides, — 
deep green but not lucid oo slightly pale beneath, coloring 
shades of red in autumn; ascending prominent veins in six to 
nine pairs; petioles from one third to one half the length of the 
bla Racemes erect, straight, short, dense, seven- to ten- 
flowered, grayish villose on unfolding, the bracts pale tan, the 
erect lower pedicels 1.2 —1.8 cm. long in flower, 1.5-2.2 cm. long 
in fruit; hypanthium large, tube cup-shaped, villose without, usu- 
ally tomentose within; sepals short from a broad base, ascending 
- or erect after petals fall; petals five, 3-5 mm. long, I-3 mm. broad, 
obovate on spatulate, yellowish white or dull yellow; blooming 
period extending on some plants from late April to late May. 
Fruit subglobose or depressed-globose, the summit of the ovary 
usually lanate, 6-10 mm. thick when fully mature (the last week 
in June except on some of the upper pedicels), sweet and juicy, 
purple-black without bloom, capped by the erect calyx lobes. 
On rocky banks along the Potomac River, Fairfax County, 
Virginia. Specimens are being deposited in several herbaria. 
The variety here proposed shows the remarkable small yellow- 
ish petals, which are characteristic of the typical A. micropetala. 
Its blooming period begins with that of A. stolonifera and A. ob- 
longifolia but continues two weeks longer. It is further character- 
ized by its very large hypanthium. Specimens were submitted 
to the Gray Herbarium for comparison with the var. micropetala 
Robinson, and Dr. J. F. Macbride, who made the comparison, 
reports that its leaves closely match some of the material from 
Connecticut, which ‘exhibits the very broad leaves of stolonifera.” 
It is therefore probable that this material should be also referred 
to the var. potomacencis. In its Potomac station, the new variety 
blooms at about the same time as A. sera, with which it is asso- 
ciated. Its petals exhibit considerable variation in size, but no 
specimens were seen in which the number exceeded five or in which 
there was actual loss of the petal form, agreeing in these respects 
with the material of A. micropetala described by Weatherby. If 
the plant was originally a teratological form it would now seem 
from its local abundance to have become self-perpetuating. 
