This section is from the book "The Standard Cyclopedia Of Horticulture Vol2", by L. H. Bailey. See also: Western Garden Book: More than 8,000 Plants - The Right Plants for Your Climate - Tips from Western Garden Experts.
Puberulent but not glandular: leaves opposite, stalked, round-ovate, light green, 2-4 in. long, taper-pointed, sharply or bluntly toothed: heads very numerous in a wide (3-10 in.) flattish corymb. Uplands of Mex. - Essentially herbaceous, 1-3 ft. high. Recently introduced in cult, in S. Calif. Promising for cut -flowers and as a window plant.
(E. elegans, Hort. E. lati-folium, Hort.). Fig. 1434. Shrubby, erect, with slender hard glabrous brown stems: leaves of firm texture though scarcely leathery, small, lance-oblong or ovate-oblong, tapering into a strong rather short petiole, blunt or pointed, wavy-margined or small-toothed: flowers (sometimes blush) in ascending cymose clusters, together forming a long terminal leafy panicle. Uplands of Mex.
Fig. 1434. Diffuse, becoming woody at base, 2 ft., the stems slender, puberulent and usually reddish: leaves opposite, long-lance-shaped, taper-pointed and at base narrowed to a long petiole, prominently 3-ribbed, toothed: heads in rather compact long-stalked clusters. Mex. Gt. 15:525. Gn. 40, p. 134. - Good winter bloomer. Best for florists. Readily cult, in coldhouse.
Joe-Pye Weed. Leaves whorled, commonly in 5's and 6's, oblong or lanceolate, taper-pointed, coarsely serrate: heads in large compound clusters, pale purple or flesh-colored, rarely almost white. N. Amer. - Common and variable. Tall, rank plant of low grounds (reaching 8-9 ft.), good for bold effects in border or against shrubbery. variety maculatum, Darl. Of lower growth: leaves commonly in 4's, ovate-oblong, roughish-pubescent: heads in smaller clusters, more deeply colored. variety foliosum, Fern. Similar but with the infloresence surpassed by the long upper leaves variety amoenum, Gray. - Still lower (2 ft. high), smoothish: leaves sometimes merely opposite.
Hemp Agrimony. Resembling Joe-Pye weed in general habit and with similar pale purple heads in terminal clusters: leaves opposite, but deeply 3-parted in a manner to suggest verticillate leaves Eu. - Common. May be used like the preceding species but less desirable. Thrives best in limy alluvial soil. Eng. Bot. 6:428. - The Asiatic E. Kirilowi, Turcz., is a very nearly related plant of lower growth (1-3 ft.), with narrower (linear-oblong) coarsely toothed leaf - segments, the lateral often much reduced. Strict herb with dense terminal corymb of dull greenish purple heads. Gt. 24:850.
(Conoclinium coelestinum,'DC). Mist-Flower. Somewhat pubescent: leaves opposite, stalked, triangular-ovate, somewhat cordate, thin, coarsely toothed: heads as in Ageratum in compact clusters, many-flowered, light blue to violet. N. J. to Mich., Kans., and southward. - Perennial herb, late-blooming, heliotrope-flowered Appropriate to low borders.
Boneset. Thoroughwort. Fig. 1435. Hairy: leaves lance-oblong, the pairs united at base about the stem, wrinkled, remotely toothed or entire, taper-pointed: heads in dense terminal compound cymes. N. Amer., common in low rich soil. - Stout, slightly rank-smelling plant, 2-3 ft. high, long used in domestic medicine and found in old gardens. Excellent for striking effects, especially in low grounds. Flowers grayish white or in a comparatively rare variety (forma purpureum, Brit.) bluish purple. In variety truncatum, Gray, the leaves (at least the upper ones) are rounded or truncate at the sessile base, not united about the stem A peculiar form apt to be encountered occasionally in large cultures.
Fig. 1435. Eupatorium perfoliatum. (x 1/3)
Grayish green, downy, much branched: leaves opposite, narrowly lance-shaped, tapering to both ends, short-stalked, remotely toothed or entire: heads only 5-flowered Pa. to Minn., Neb., and southward. - Tall, vigorous herb, 4-8 ft. high, in open places and dry soil. Not very ornamental. See page 3568.
Rough-hairy: leaves opposite, lance-oblong, coarsely serrate, essentially sessile, veiny: involucral scales scarious-margined: florets white. L. I., southward near the coast. - Somewhat attractive for border planting and specially suited to poor sandy soil.
Upland Boneset. Leaves oblong-lanceolate, gradually tapering almost from the rounded sessile or nearly sessile base to the apex: heads 5-flowered, white. Vt. to Mo. and southward. - A trim, smooth highly attractive hardy species. Thrives best in limy alluvial soil.
(E. ageraloides, Linn. f.). White Snakeroot. Fig. 1436. Leaves opposite, thin, long-stalked, ovate with broad base, acuminate, coarsely and sharply serrate, green on both sides: heads small in loose but ample clusters; florets bright white. E. N. Amer. Mixed woods, common. - Neat, smoothish, branching herb, 2-4 ft. high. One of the best of the perfectly hardy summer-blooming species.
Fig. 1436. Eupatorium urticae-folium (X 1/3)
Much like the preceding but usually hairy: leaves thickish and blunt or scarcely pointed, blunt-toothed: later-flowering, not aromatic. Mass. and southward near the coast. - Suited to very sandy soil. variety melissoides, Gray (E. Fraseri and E. cordifolium, Hort.). Slender, roughish, strict: heads 5-12-flowered: leaves subcordate, ovate or oblong, obtuse, the petioles often very short. S. E. U. S. - Also suited to poor and sandy soil, but more tender than the typical form.
The following species are said to have been recently introduced into European horticulture and to promise well: E. deltoideum, Jacq. A soft-wooded half-shrub with opposite triangular-hastate crenately toothed leaves 3-5 in. long and somewhat pale and slightly velvety beneath, the basal lobes widely spreading acute: If. - stalks 1-3 in. long: heads of rosy purple flowers in thyrsoid panicles; involucral scales linear, very sharp, scarcely imbricated. S. Mex. A glasshouse species with striking foliage. - E. herbaceum, Greene (E. arizoni-cum, Hort.). An erect smooth or merely pulverulent perennial 1-3 ft. high, with opposite triangular-ovate pale green leaves 1-3 in. long with rounded basal lobes, toothed sides, and rather short but slender stalks: flowers white; heads in broad rounded terminal clusters. S. W. U. S. Half-hardy and suited to dry places. E. japonicum, Thunb. Erect perennial resembling E. cannabinum, with dull purplish to greenish white flowers in flat clusters: lower leaves deeply 3-parted, the upper simple: not very attractive.