GENUS 9. THISTLE FAMILY. 369 
9. TRILISA Cass. Dict. Sci. Nat. 55: 310. 1828. 
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 elon- 
gated, barbed bristles. [Anagram of Liatris.] 
Two knows species, natives of the southeastern United States. Type species: Trilisia odora- 
tissima (Walt.) Cass. a ps , 
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. 
paid a odoratissima Walt. Fl. Car. 198. 
Ligiris odoratissina Michx. Fl. Bor. Am. 2: 
93. 1803. it 
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, 1-14’ 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 
} 2. Trilisa paniculata (Walt.) Cass. 
Pes Hairy Trilisa. Fig. 4189. 
Anonymos paniculatus Walt. Fl. Car. 198. 1788. 
Liatris paniculata Michx. Fl. Bor. Am. 2: 93. 
Ye 1803. 
‘ We Trilisa paniculata Cass. Dict. Sci. Nat. 55: 310. 
Ee 1828, 
Stem viscid-pubescent, 1°-3° high. Leaves 
entire, the basal ones lanceolate or narrowly 
oblong, acute or obtusish, 3’-10’ long, 3’-12’ 
wide, those of the stem much smaller, lan- 
ceolate 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. 
ro. GUTIERREZIA Lag. Gen. & 
Sp. Nov. 30. 1816. 
Erect branching, usually glabrous and often glutinous herbs, or shrubs, with linear entire 
alternate leaves, and small heads of both tubular and radiate yellow flowers, corymbosely 
paniculate in our species. Radiate flowers few, pistillate. Disk-flowers regular, mostly 
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