DESCRIPTION OF MEDICINAL PLANTS. 
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elongated spike of starry yellow flowers. Calyx-tube top- 
shaped, contracted at the throat, beset with hooked bristles 
above, indurated and inverted in fruit. Petals 5, stamens 
5-15. FI. June; collected while blooming. 
Rubus villosus, Ait. Common or High Blackberry. Shrubby, 
1-6° high, stems furrowed, upright or reclining, armed with 
stout, curved prickles; branchlets, stalks aud lower surface 
of the leaves hairy and glandular; leaflets 3 or pedately 5, 
ovate, pointed, unequally serrate, the terminal ones somewhat 
heart-shaped, conspicuously stalked. Flowers racemed, nu- 
merous. Berries black. Waste grounds. 
Rubus trivialis, Michx. Low Bush-blackberry. Frequents 
poor, low, gravelly hills. It is shrubby, procumbent, bristly 
and prickly; leaves evergreen, coriaceous, nearly glabrous ; 
leaflets 3 or pedately 5, ovate oblong, sharply serrate. Pe- 
duncles 1-3 flowered, petals large. The bark of the roots of 
either is collected. 
Potentilla Canadensis, L. Cinquefoil. Low, herbaceous plant, 
the slender stems prostrate, and running, and widely spread- 
ing ; 5-petaled, yellow flowers on solitary axillary peduncles. 
Achenes many, collected in a head on the dry, hairy recep- 
tacle. Leaves ternate, but apparently pinnate by the part- 
ing of the lateral leaflets. Leaflets cuneate-oblong, incisely 
serrate. Covering old fields and sterile lands. The herb, 
collected in flower. 
Spiraea tomentosa, L. Hardhack. Steeple- bush. Erect shrub 
with simple leaves. Stems and lower surface of the ovate or 
oblong serrate leaves very woolly ; stipules obsolete. Calyx 
5 cleft, persistent; petals 5 obovate; flowers in short ra- 
cemes, crowded in a dense panicle, rose color; pods woolly. 
A pretty plant, suitable for cultivation in the flower-garden. 
Hilly country on the borders of Kentucky. The leaves, 
collected in summer. 
Pyrus Americana, DC. Americaa Mountain ash. A medium 
size tree confined to the higher ridges aud mountain- tops of 
East Tennessee. The leaves are odd-pinnate, with rather 
