Grindelia campo'rum,or G. Cuneifo'lia, G. Squarro'sa, Grindelia, Gum-plant, N.F. -- The dried leaves and flowering tops with not more than 10 p.c. of stems over 2 Mm. (1/12') thick, or 2 p.c. of other foreign organic matter; N. America, west of Rocky mountains. Plants -- small perennial, woody herbs, .3-1 M. (1-3 degrees) high, bushy; stems and branches cylindrical, yellowish, pinkish, alternate leaf-scars and basal portions of leaves, sometimes flexuous and coated with resin, terminating in resinous flower-heads; leaves usually separate and broken, oblong, oblong-spatulate, 1-7 Cm. (2/5-3') long, sessile, or amplexicaul, serrate, yellowish-green, resinous, coriaceous, brittle; flower-heads 5-20 Mm. (1/5-4/5') broad, urceolate, resinous, involucre bracts numerous, imbricated with recurved tips; ray-florets yellowish-brown, ligulate and pistillate; disk-florets yellow, perfect, pappus of 2-3 linear arns; disk achenes ovoid, oblong, angled, irregular simmit; odor balsamic; taste aromatic, bitter, resinous. Powder, yellowish-brown -- numerous fibrous fragments bearing tracheae with thickenings or pores, lignified wood-fibers, pith cells with protoplasm bearing spheroidal granules; fragments of leaf epidermis with polygonal areas, chloroplastids, glandular hairs, spherical pollen grains; solvent: alcohol; contains resin (activity), bitter principle 1-2 p.c., volatile oil, grindeline, fixed oil, tannin 1.5 p.c., ash 7-8 p.c. Cardiac tonic (slows heart action), expectorant, antispasmodic, diuretic; asthma, bronchitis, whooping-cough, catarrh of bladder and uterus, poisoning by rhus toxicodendron -- in solution or poultice. Dose, gr. 15-60 (1-4 Gm.); 1. Fluidextractum Grindeliae (75 p.c. alcohol), dose, mxv-60 (1-4 cc.). Extract, gr. 5-15 (.3-1 Gm.). Infusion. Tincture. G. Glutino'sum, stem often purplish tomentose, and G. Hirsu'tula, W. United States, being very similar are often collected and mixed with commercial drug.