408 ORDER LXVHI. COMPOSITE. 



Genus LXXXVL— HIERA'CIUM. Tou'rn. 

 (From hierax, a hawk.) 



Involucre imbricate ; receptacle naked ; pappus simple, per- 

 sistent, setaceous. Flowers yellow, solitary or corymbose, 

 perfect. 



1. H. Mauia'num, (Willd.) (H. scabrum, Mich.) Stem erect, villous and 

 scabious, leafy. Leaves sessile, obovate, oblong, strigose, upper leaves 

 small, lower ones denticulate. Flowers in irregular panicles; involucre 

 hispid, tornentose ; florets numerous. — Yellow. 2£. Aug. — Sept. 

 Mountains. 2 — 4 feet. 



2. II. Groxo'vii, (L.) Stem leafy, erect, hairy, with a glandular pu- 

 bescence. Leaves few, near the base of the stem, ovate, sessile, ciliate, 

 pubescent. Flowers in terminal panicles; involucre cylindric, covered 

 with hispid glands. Seed oblong, furrowed. — Yellow. If. June — 

 Sept. In dry soils. Common. 



3. H. vexo'sum, (L.) Stem herbaceous, glabrous toward the summit, 

 hairy at the base. Leaves all radical, ovate-oblong, little hairy on the 

 upper surface, entire, margins ciliate, with dark red veins. Flowers in 

 corymbose panicles; involucre glabrous. Seed striate, receptacle dot- 

 ted. — Yellow. If. May — June. In shaded soils. 1 — 2 feet. 



Veiny Hawk weed. 



4. H. panicula'tdm, (L.) Stem leafy, erect, pubescent beneath, gla- 

 brous above. Leaves lanceolate, denticulate, glabrous. Flowers in large 

 compound panicles, on slender peduncles ; involucre with the interior 

 leaves very narrow, glabrous. Seed furrowed. — Yellow. If. July — 

 Sept Mountains. 



Genus LXXXVII.— NAB' ALUS. Cass. (Prenanthes, L.) 

 (From naola, a harp, alluding to the lyrate leaves.) 



Involucre cylindric, in a single row, somewhat imbricate at 

 the base with a few appressed scales ; receptacle slightly pitted. 

 Florets perfect. Stigmas somewhat hispid, filiform. Fruit nar- 

 row, angled ; pappus pilose, erect, persistent, colored, scabrous. 



1. N. al'bus. (P. serpentaria, Pursh.) Stem erect, nearly glabrous. 

 Leaves hastate, radical ones palmate, cauline ones on long petioles, sin 

 uate, pinnatifid, somewhat 3-lobed, middle segment 3-parted, with a 

 long, attenuated base, upper leaves lanceolate. Flowers in terminal, 

 paniculate racemes, nodding ; florets 12 in each capitulum ; involucrum 

 8-cleft. — Purple. If. Mountains. Aug. — Oct. Upper district of Car- 

 olina. Rattlesnake-root. White Lettuce. Liori s-foot. 



2. N. altis'simus, (Hook.) {Prenanthes altissima, L.) Stem erect, 

 branching, glabrous. Leaves 3-lobed, alternate, angled, nearly has; ate, 

 slightly dentate, scabrous on the margin. Flowers in axillary racemes, 

 nodding; involucre about 5-flowered, cylindrical. Seeds angular, stri- 

 ate. — Yellow. If. Aug. — Sept. 4 — 6 feet. 



3. N. Fra'sert, (D. C.) (Prenanthes alba, Ell.) Ste?n herbaceous, 

 much branched, pubescent, slightly angled; radical leaves hastate, an- 

 gled, toothed; upper laves Bpatulate, ohovate-lanceolate, toothed and 

 angled. Flowers in loose panicles, in terminal clusters, nodding; florets 

 8 — 12 in a capitulum; involucrum with 8 oblong pubescent leaves 



