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. Brauches of the style linear, with a very
short obtuse or conical appendage. Acbenia 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 white often deciduous wool, or somewhat glabrous;
with sulcate-angled stems, and corymbose or solitary heads. Leaves alternate,
pinnately lobed or divided. Flowers whitish, in a single species
yellow.
* Scales of the spreading involucre, and often the bracts, petaloid {whitish): corolla with
a filiform tube, and a deeply deft limb {the nerves of the lobes intermediate between the
margins and the axis).
1. H. scabiosceus (L’Her.): clothed with a more or less deciduous ap-
pressed wool; leaves pmnately, or the radical and lower bipinnately parted ;
the segments linear or oblong, entire or sparingly toothed; heads (rather
t f n / i o ^ a y iS1T P f aDd 10086 Sma11 corymbs; scales (about of the involucre 10) roundish-obovate, petaloid, dilated, exceeding the disk; achenia
Mtchx. .- f l . 2. p..1 0 4 ;S ' PiHurs Wh, fl. S2 V. epr^. 5M19 Sf S742 ^ ;H Ee rll.. dsike.s , cum M ; 2. p. 313 ;
i. J,% cry°inuT.' , 1. oo7.6 58- ■Rothla Carolmiensis, Lam. jour. hist. nat. 1. p. 16’
Dry pine barrens, and around ponds, South Carolina ! to Florida ' Also
Western Louisiana, Dr. Hale! April-May.—® or U ? Stem 1^3 feet
h!gh. ; Leaves variable, when young often'tomentose, woolly or canescent on
both sides, at length frequently glabrous or nearly so, as well as the stem.
Achenia somewhat hairy when young, minutely glandular-pubescent (under
a lens) when mature. r ' 1
2. I I artemisicefolius (DC.) : stem woolly when young, paniculatebranched
; leaves densely tomentose-canescent beneath ; the radical and
Jower cauhne 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 lobesjanceolate, 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 vil ous; scales of the pappus somewhat conspicuous*, spatu-
late-oblong.—DC. prodr. 5. p. 658. . 1 * p u
Texas, Berlandier,' Drummond! Mr. Lindheimer!—1§) Stem 2-3 feet
high. Radical leaves 4-6 inches long. Corymb large, glandular-tomentose.
Heads mocli smaller than in the preceding.
3. H. corymbosus •• somewhat tomentose when young, at length nearlv
glabrous; stem much branched; leaves 1- 2-pinnately divided, the division^
or lobes narrowly linear, often incised or toothed; heads (small) very numerou?’
|ln.w ^ PTJIK cory ,inbf ; f ales of the involucre (8- 12) oblong-obovate,
petaloid (the base mostly herbaceous), about the length of the disk ; achenia
orb>MH 3 * S°mewhat Imbescent on the angles; scalesofthe pappus minute,
3. Nuttallii: lower leaves 3-pinnately, the upper 1-2-pinnately divided or
parted; the segments very narrowly linear, mostly entire.—H. tenuifolius.
Nutt.. m herb. DC. Sfc. (pi. Arkans.), not of Pursh.
Prairies of Arkansas, Dr. Leavenworth! Texas, Drummond! ft. Red
River, Arkansas, Nuttall!—(2) Stem 2-3 feet high, loosely corymbose
above ; the branchlets minutely tomentose and somewhat glandular. Lower
leaves somewhat petioled. Heads one-fourth to one-third of an inch in
diameter. Scales of the involucre unequal, the larger somewhat dilated.—
The pappus in var. /?. is somewhat more conspicuous, and the lobes of the
leaves more slender. So far as relates to the specimen of Nuttall, this is the
H. tenuifolius of De Candolle, who, unacquainted with Pursh’s plant, has
modified the character of that author, so that it no longer accords witlveither
species.
* * Sccdes o f the oppressed involucre with whitish or scarious margins: tube o f the corolla
not longer than the 5-toothed or cleft limb.
4. H. tenuifolius (Pursh): lanuginous-canescent; stem stout, corymbose
at the summit; leaves bipinnately divided ; the divisions very narrowly
linear, entire, rigid, somewhat glabrous; heads in a loose compound corymb;
scales of the involucre (6- 8) oval, appressed, much shorter than the fully developed
disk; achenia very villous; scales of the pappus spatulate-oblong,
as long as the tube of the corolla.:—Pursh! fl. 2. p. 742; N u tt.! gen. 2.
p. 139 ; DC. prodr. 5. p. 658. (excl^syn. Nutt. pi. Arkans., and a part of the
character founded on it.)
Upper Missouri, Bradbury! Nuttall! (v. sp. in herb. Lamb.) Mr. Nicollet!
on gravelly hills, &c. May-June.—@ Stem 12-15 inches high.
Leaves sessile, rigid, the pinnae of the lower in 8-12 pairs; the d.visions 2-4
pairs, irregular and unequal; occasionally somewhat 3-pinnatifi 1. Heads
pedunculate, fastigiate, a third of an inch in diameter; the involucre not
spreading and petaloid as in all the preceding. Flowers greenish-white.
Throat of the corolla short, abruptly inflated, about the length of the tube,
deeply 5-toothed. Achenia more villous, and the pappus more conspicuous
than in any other species ; the scales of the latter somewhat denticulate at
the apex.
5. H. filifolius (Hook.): tomentose-canescent, the pubescence somewhat
deciduous; stem loosely paniculate-branched ; leaves 1- 2-pinnately divided;
the divisions scattered, rigid, filiform-linear, canaliculate ; peduncles mostly
solitary ; scales of the involucre (about 12) oval, appressed, shorter than the
disk; achenia villous; scales of the inconspicuous pappus somewhat lacer-
ate.—Hook.! fl. Bor.-Am. 1 . p. 317 ; Nutt. ! in trans. Arner.phil. soc. 1. c.
p. 374.
Arid plains of the upper Oregon, Douglas! Nuttall!—2f ? Stem 10-20
inches high. Lower leaves petioled : the divisions few, often simple and an
inch or more in length. Heads fully as large as in the preceding. Achenia
less angled or tapering at the base, not. dilated at the apex ; the hyaline
scales of the pappus nearly concealed among the villous hairs of the ache-
nium, and shorter than the tube of the (white) corolla.—In Mr. !Nuttall’s
specimens, the pappus is lpore conspicuous than in those collected by
Douglas.
6. H. luteus (Nutt.): dwarf, woolly-canescent; stems several from a
thick caudex; leaves petioled, chiefly radical, pinnately-divided ; the divisions
very much crowded, small, pinnatifid or trifid ; the lobes very short,
linear, obtuse; heads (small) somewhat paniculate; scales of the involucre
(about 12) oblong-obovate, appressed, rather shorter than the disk; achenia
very villous; scales of the pappus lacerate or denticulate, shorter than the
tube of the (yellow) corolla.—Nutt. ! in trans. Amer. phil. soc. 1. c.
Rocky Mountains near the sources of the Colorado of the West, particular