Genus 9. 



THISTLE FAMILY. 



3 6 9 



9. TRILISA Cass. Diet. 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 I or 2 series of elon- 

 gated, barbed bristles. [Anagram of Liatris.] 



Type species : Trilisia odora- 



T. odoratissima. 

 T. paniculata. 



Two knows species, natives of the southeastern United States. 

 lisshna (Walt.) Cass. 



Stem glabrous ; heads corymbose-paniculate. 

 Stem viscid-pubescent ; heads thyrsoid-paniculate. 



i. Trilisa odoratissima (Walt.) Cass. 



Vanilla-leaf. Yanilla-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. Diet. 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'-io' long, i'-ii' wide, those of the 



stein 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. 



2. Trilisa paniculata (Walt.) Cass. 

 M^ Hairy Trilisa. Fig. 4189. 



r.. 



AnonymospaniculatusWa.lt. Fl. Car. 198. 1788. 

 Liatris paniculata Michx. Fl. Bor. Am. 2: 93. 



1803. 

 Trilisa paniculata Cass. Diet. Sci. Nat. 55 : 310. 



1828. 



Stem viscid-pubescent, i-3 high. Leaves 

 entire, the basal ones lanceolate or narrowly 

 oblong, acute or obtusish, 3'-io' long, i'-iY 

 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. 



10. 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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