638 COMPOSITAE 
4. E. album, L. (Fig. 1, pl. 171.) Wuite THorovcHwort. Stem 
simple below, branched above, 1 to 3 ft. high. Leaves opposite, egg- 
shaped or oblong, without leaf-stalks, coarsely toothed. Whole plant 
somewhat rough hairy. Flowers white. Southern part of our area. Aug.- 
Sept. 
5. E. hyssopifolium, L. (Fig. 4, pl. 170.) Hyssop-travep Tuor- 
oUGHWORT. Stem simple below, branched above. Leaves narrowly linear, 
opposite, the upper perhaps alternate, other leafy branches starting at the 
axils give appearance of whorls of leaves. Plant rather rough hairy. 
Flowers white. Dry fields, Mass., and southward. Aug.-Sept. 
6. E. altissimum, L. (Fig. 4, pl 171.) Tati THoroucHwort. Stem 
3 to 6 ft. high, with fine down, much branched above. Leaves lance- 
shaped, tapering at each end, conspicuously 3-nerved, the borders toothed 
above the middle, or the upper leaves without teeth, 2 to 5 in. long, 4 in. 
or more broad. Flowers in a broad umbel-like cluster, white. Pennsyl- 
vania and southward. Sept.-Oct. 
7. E. sessilifolium, L. (Fig. 5, pl. 171.) Uptanp Boneser. Plant 
smooth, 2 to 6 ft. high, nearly smooth. Leaves opposite, lance-shaped, 
sharply toothed at borders, rounded or heart-shaped at base, nearly clasp- 
ing the stem, 3 to 6 in. long. Flower heads numerous in a broad umbel- 
like cluster, flowers white. Dry woods, eastern part of our area. Aug.- 
Oct. 
8. E. verbenaefolium, Michx. (Fig. 6, pl. 171.) RovucnH THorovcH- 
wort. Stem 3 to 8 ft. high, branched above. Leaves opposite, without 
leaf-stalks, egg-shaped, margins toothed; the whole plant very rough hairy. 
Flower heads in a broad nearly flat cluster, flowers white. Moist soil, 
Mass., and southward. July-Sept. 
9. E. rotundifolium, L. (Fig. 11, pl. 171.) Rounp-LEAvED THor- 
ouGHWoRT. Stem 1 to 3 ft. high; leaves opposite without leaf-stalks, 
roundish, about as broad as long; margins toothed; the whole plant rough 
hairy. Flowers white. Southern part of our area. July-Sept. 
10. E. pubescens, Muhl. (Fig. 7, pl. 171.) Harry Trorovanwort. 
Plant about 2 ft. high, downy or hairy. Leaves opposite, without leaf- 
stalks, egg-shaped or lance-shaped, rounded at base and tapering to a slen- 
der point at apex. Teeth prominent. Flowers white. Dry soil, New Eng- 
land and southward. July-Sept. 
1l. E. perfoliatum, L. (Fig. 1, pl. 170.) Bonresrer. THorovucn- 
worr. Stem simple below, branched above, 2 to 5 ft. high, downy. Leaves 
opposite and seemingly continuous, the stem appearing to penetrate the 
double-pointed leaf (perfoliate). Flower heads in a broad flat cluster, 
the whole plant usually with a whitish appearance. Flowers white. In 
wet places, throughout our area. July-Sept. 
12. E. resinosum, Torry. (Fig. 8, pl. 171.) Resin Boneset. 
Slender, 2 to 3 ft. high, velvety downy. Leaves opposite, narrow lance- 
shaped, tapering at each end, without leaf-stalks. Flowers white. Wet 
places. Southern part of our area. Aug.-Sept. 
13. E. ageratoides, L. (Fig. 3, pl. 170.) Wauuire Sanictr. Stem 
