Heads many-flowered; the flowers all tubular, diœcious, i.e., the pistillate and staminate borne by different plants. Involucre imbricated. Corolla of the pistillate flowers very slender and thread-like; of the staminate, larger and 5-lobed. Anthers tailless. Achenes ribbed; pappus of capillary bristles, in the sterile plant scanty and tortuous; in the fertile very long and copious.--Shrubs, commonly smooth and resinous or glutinous. Flowers whitish or yellow, autumnal. (Name of some shrub anciently dedicated to _Bacchus_.) 1. B. halimifòlia, L. Smooth and somewhat scurfy; branches angled; leaves obovate and wedge-form, petiolate, coarsely toothed, or the upper entire; heads scattered or in leafy panicles; scales of the involucre acutish.--Sea beaches, Mass. to Va., and southward.--Shrub 6--12° high; the fertile plant conspicuous in autumn by its very long and white pappus. 2. B. glomeruliflòra, Pers. Leaves spatulate-oblong, sessile or nearly so; heads larger, sessile in the axils or in clusters; scales of the bell-shaped involucre broader, very obtuse.--Pine barrens, E. Va. (?), and southward. 28. PLÙCHEA, Cass. MARSH-FLEABANE. Heads many-flowered; the flowers all tubular; the central perfect, but sterile, few, with a 5-cleft corolla; all the others with a thread-shaped truncate corolla, pistillate and fertile. Involucre imbricated. Receptacle flat, naked. Anthers with tails. Achenes grooved; pappus capillary, in a single row.--Herbs, somewhat glandular, emitting a strong or camphoric odor, the heads cymosely clustered. Flowers purplish, in summer. (Dedicated to the Abbé _Pluche_.) 1. P. bífrons, DC. _Perennial_, 2--3° high; _leaves closely sessile or half-clasping_, oblong to lanceolate, sharply denticulate, veiny (only 2--3´ long); heads clustered in a corymb; scales lanceolate.--Low ground, Cape May, N. J., and southward. 2. P. camphoràta, DC. (SALT-MARSH FLEABANE.) _Annual, pale_ (2--5° high); _leaves scarcely petioled_, oblong-ovate or lanceolate, thickish, obscurely veiny, serrate; corymb flat; involucral scales ovate to lanceolate. (P. fœtida, _DC._)--Salt marshes, Mass. to Va., and southward, and on river-banks westward to Ky., Ill., and Neb. (?) 29. ÈVAX, Gaertn. Heads rather many-flowered, discoid; flowers as in Pluchea, the central usually sterile. Involucral scales few, woolly. Receptacle convex to subulate, chaffy, the scarious chaff not embracing the smooth dorsally compressed achenes. Anthers with tails or acutely sagittate; pappus none.--Low, densely floccose-woolly annuals; extreme western. (Name of uncertain signification.) 1. E. prolífera, Nutt. A span high or less, simple or branching from the base; leaves numerous, small and spatulate; heads in dense proliferous clusters; receptacle convex; chaff subtending the sterile flowers woolly-tipped, the rest more scarious and naked, oval or oblong.--Dak. and W. Kan. to Tex. 30. FILÀGO, Tourn. COTTON-ROSE.