130 
Polymnia Canadensis, L., var. radiata, A. Gray. Ina rocky rivulet 
on the Southern cliffs of the Pinnacle, near Cumberland Gap, 
alt. 2,550 ft. 
Polymnia Uvedalia, L. Woods near the South Fork Holston 
River, alt. 2,200 ft. Banks of the Middle Fork Holston River 
at Marion, alt. 2,100 ft. 
Silphium trifoliatum, L. Valley of the Middle Fork Holston River 
below Marion, alt. 2,100 ft. White Sulphur Springs, W. Va., 
alt., 3,000 ft. (A. Brown). 
Ambrosia artemisiæfolia, L. Shore of Middle Fork Holston River, 
Marion alt. 2,100 ft. | 
Parthenium integrifolium, L. About Lynchburg, alt. 500 ft. 
Xanthium spinosum, L. Along McGrady's Creek, foot of White 
Rock Mt., alt. 2.200 ft. Vicinity of Wytheville, alt. 2000 ft. 
Along the South Fork Holston River near Add Wolf, alt. 
2,200 ft. 
Heleopsis helianthoides (L.) B. S. P. Banks of the Middle Fork 
Holston River at Marion, alt. 2,100 ft. Along Nick's Creek, 
alt. 2,600 ft. On the Iron Mts., by Hog-trough Creek, alt. 2,600 
ft. On Chestnut Creek, near Gossan, alt. 2,300 ft. 
Rudbeckia laciniata, L. Along Hog-trough Creek, alt. 2,600 ft. 
Rudbeckia triloba, L. Slope of White Rock Mt. alt. 3,800 ft. 
Vicinity of Cumberland Gap, alt. 1,500 ft. 
Y RUDBECKIA BRITTONH, Small, n. sp. Perennial, stout, hispid. 
Stem erect 5—7 dm. tall, simple, channeled, very hispid, leafy 
throughout or naked above; radical leaves ovate or ovate- 
lanceolate, about 1 dm. long, obtuse, on petioles 4-8 cm. long, 
petioles somewhat clasping, upper leaves obovate, on broadly 
winged petioles, inclined to be one-lobed, uppermost leaves 
ovate or ovate-lanceolate, sessile, cordate, all of much the 
same size, distantly serrate-crenulate, strigose on both surfaces; 
involucre foliaceous, bracts oblong, 2-3 cm. long; head 1.3 
cm. high; rays yellow, twelve, 2.5-3.5 cm. long, two-cleft at 
the apex; outer chaff oblanceolate, inner almost linear, acute, 
purple tipped and fringed with jointed hairs, style-tips slender, 
acute. (Plate 79.) 
