372 COMPOSITE. Htmenopappds. 



ovate, membranaceous or petaloid (white), obtuse. Receptacle small, naked. 

 Corolla with a slender glandular tube, and a dilated campanulate throat; the 

 lobes revolute. Anthers exserted. Branches of the style linear, with a very 

 short obtuse or conical appendage. Achenia turbinate, contracted at the 

 base as if stipitate, broad at the summit, many-striate, somewhat 4-sided 

 when mature. Pappus of 12-20 short and obtuse membranaceous (nearly 

 nerveless) scales, in a single series. — Biennial or perennial (N. American) 

 herbs, clothed with a wliite often deciduous wool, or somewhat glabrous ; 

 with sulcate-angled stems, and corymbose or solitary heads. Leaves alter- 

 nate, pinnately lobed or divided. Flowers whitish, in a single species 

 yellow. 



* Scales of the spreading involucre, and often the bracts, petaloid (lohitish'): corolla with 

 a filiform tube, aiid a deeply cleft limb (J,he nerves of the lohes intermediate between the 

 margins and the axis'). 



1. H. scahiosceus (L'Her.): clothed with a more or less deciduous ap- 

 pressed wool ; leaves pinnately, or the radical and lower bipinnately parted ; 

 the segments linear or oblong, entire or sparingly toothed ; heads (rather 

 large) in nearly simple and loose small corymbs; scales of the involucre 

 (about 10) roundish-obovate, petaloid, dilated, exceeding the disk ; achenia 

 somewhat hairy; scales of the pappus very small. — " L Her. diss, cum ic." ; 

 Michx. ! fl. 2. p. 104 ; Pursh, ft. 2. p. 519 Sf 742 ; Ell. sk. 2. p. 313 ; 

 DC. prodr. 5. p. 658. Rothia Caroliniensis, La7n. jour, liist. nal. 1. p. 16, 

 t. 1, S^-ill. i. 667. 



Dry pine barrens, and around ponds. South Carolina ! to Florida ! Also 

 Western Louisiana, Dr. Hale! April-May. — (f) or li 1 Stem 1-3 feet 

 high. Leaves variable, when young often tomentose, woolly or canescent on 

 both sides, at length freciuently glabrous or nearly so, as well as the stem. 

 Achetiia somewhat hairy when young, minutely glandular-pubescent (under 

 a lens) when mature. 



2. H. artemisicefoliits (DC.) : stem woolly when young, paniculate- 

 branched ; leaves densely tomentose-canescent beneath ; the radical and 

 lower cauline petioled, lanceolate-oblong, entire, or often sinuate-incised or 

 pinnatifid, especially towards the base ; the upper sessile, pinnatifid with the 

 terminal lobe largest, the lateral lobes lanceolate, acute; the uppermost often 

 entire ; heads (small) numerous, in loose compound corymbs ; scales of the 

 involucre (8-10) oval or oblong, unequal, petaloid, scarcely exceeding the 

 disk ; achenia villous ; scales of the pappus somewhat conspicuous, spatu- 

 late-oblong. — DC. iirodr. 5. j)- 658. 



Texas, Berlandier, Driimmond ! Mr. Lindheimer .' — (f) Stem 2-3 feet 

 high. Radical leaves 4-6 inches long. Corymb large, glandular-tomentose. 

 Heads much smaller than in the preceding. 



3. H. corymhosus : somewhat tomentose when young, at length nearly 

 glabrous; stem much branched; leaves 1-2-pinnately divided, the divisions 

 or lobes narrowly linear, often incised or toothed ; heads (small) very numer- 

 ous, in compound corymbs ; scales of the involucre (8-12) oblong-obovate, 

 petaloid (the base mostly herbaceous), about the length of the disk ; achenia 

 glandular, somewhat pubescent on the angles; scales of the pappus minute, 

 orbicular. 



B. Nultallii: lower leaves 3-pinnately, the upper 1-2-pinnately divided or 

 parted ; the segments very narrowly linear, mostly entire. — H. tenuifolius, 

 Nutt.! in herb. DC. S^c. (pi. Arkans.), not of Pursh. 



