9. TRÍLISA, Cass.
Heads discoid, 5–10-flowered; flowers perfect. Involucral scales nearly equal, little imbricated. Receptacle naked. Corolla-lobes short-ovate or oblong. Achenes 10-ribbed; pappus of rather rigid bristles, not plumose.—Perennial herbs, fibrous-rooted, with broad entire leaves, obscurely or not at all punctate, and cymules of small heads in a thyrse or panicle. Flowers rose-purple, in autumn. (Name an anagram of Liatris.)
1. T. odoratíssima, Cass. (Vanilla-plant.) Very smooth; leaves pale, thickish, obovate-spatulate, or the upper oval and clasping; heads corymbed. (Liatris odoratissima, Willd.)—Low pine barrens, Va., and southward.—Leaves exhaling the odor of Vanilla when bruised.
2. T. paniculàta, Cass. Viscid-hairy; leaves narrowly oblong or lanceolate, smoothish, those of the stem partly clasping, heads panicled. (Liatris paniculata, Willd.)—Va. and southward.
10. GUTIERRÈZIA, Lag.
Heads few–several-flowered, radiate; rays 1–6, pistillate. Involucre oblong-clavate; scales coriaceous with green tips, closely imbricated, the outer shorter. Receptacle small, naked. Achenes short, terete; pappus of about 9 chaffy scales, shorter in the ray-flowers.—Suffrutescent (our species), glabrous and often glutinous, much branched, with narrowly linear entire alternate leaves, and small heads of yellow flowers in fastigiate or paniculate cymes. (From Gutierrez, a noble Spanish family.)
1. G. Euthámiæ, Torr. & Gray. Low; leaves numerous, 1–2´ long; heads usually crowded, the disk- and short ray-flowers usually 3 or 4 each.—Dry plains, Mont. and Minn. to central Kan., southward and westward.
11. AMPHIÁCHYRIS, Nutt.
Heads hemispherical; rays 5–10. Disk-flowers perfect but infertile. Pappus of the ray minute, coroniform; of the disk-flowers of almost bristle-like scales, more or less dilated and united at base.—A diffusely much-branched annual, with heads solitary on the branchlets; otherwise as Gutierrezia. (From ἀμφί, around, and ἄχυρον, chaff.)
1. A. dracunculoìdes, Nutt. Rather low, slender; leaves narrowly linear, the upper filiform; disk-flowers 10–20, their pappus of 5–8 bristle-like chaff united at base and slightly dilated upward.—Plains, Kan. and southward.