Erect perennial herbs, with fibrous roots and alternate simple leaves; those of the stem sessile or clasping, the basal ones narrowed into petioles. Heads small, discoid, of 5-10 purple, or white flowers, in terminal thyrsoid or corymbose panicles. Involucre campanulate, its bracts imbricated in 2 or 3 series, the outer scarcely shorter than the inner. Receptacle flat, naked. Corolla regular, its limb 5-lobed. Anthers obtuse and entire at the base. Achenes nearly terete, 10-ribbed. Style-branches slender, obtuse. Pappus of 1 or 2 series of elongated, barbed bristles. [Anagram of Liatris.]

Two knows species, natives of the southeastern United States. Type species: Trilisia odora-tissima (Walt.) Cass.

Stem glabrous; heads corymbose-paniculate.

1. T. odoratissima.

Stem viscid-pubescent; heads thyrsoid-paniculate.

2. T. paniculata.

1. Trilisa Odoratissima (Walt.) Cass. Vanilla-Leaf. Vanilla-Plant. Dog's Tongue. Carolina Vanilla

Fig. 4188

Anonymos odoratissima Walt. Fl. Car. 198.

1788. Liatris odoratissima Michx. Fl. Bor. Am. 2:

93. 1803. Trilisa odoratissima Cass. Dict. Sci. Nat. 55:

310. 1828.

Rather stout, glabrous, 2°-3° high. Leaves thick, entire, or sometimes dentate, the lower oblanceolate, oblong or spatulate, obtuse, 4'-10' long, 1'-1 1/2' wide, those of the stem gradually smaller, oblong, ovate or oval, the uppermost bract-like; heads corymbose-paniculate, about 3" high; bracts of the involucre oblong, obtusish; achenes glandular-pubescent.

In pine-barrens, North Carolina to Florida and Louisiana. Recorded from Virginia, and to be looked for in the southeastern part of that state. Deer's- or hound's-togue. Aug.-Sept.

1 Trilisa Odoratissima Walt Cass Vanilla Leaf Vani 8591 Trilisa Odoratissima Walt Cass Vanilla Leaf Vani 860

2. Trilisa Paniculata (Walt.) Cass. Hairy Trilisa

Fig. 4189

Anonymos paniculatus Walt. Fl. Car. 198. 1788. Liatris paniculata Michx. Fl. Bor. Am. 2: 93.

1803. Trilisa paniculata Cass. Dict. Sci. Nat. 55: 310.

1828.

Stem viscid-pubescent, 1°-3° high. Leaves entire, the basal ones lanceolate or narrowly oblong, acute or obtusish, 3'-10' long, 1/2'-1 1/2' wide, those of the stem much smaller, lanceolate or oblong-lanceolate; heads thyrsoid-paniculate, about 3" high; bracts of the involucre oblong, obtusish; achenes finely pubescent.

In pine-barrens, Virginia to Florida. Sept-Oct.