5. L. graveolens: shrubby, very much branched; branches pulverulent-
tomentose, whitish ; leaves very narrowly linear, 1-nerved, glabrous ; heads
(large) 5-flowered, clustered; scales of the involucre few, loosely imbricated
in about 3 series, glabrous, carinate ; the outermost very short, ovate-oblong;
the innermost elongated, linear; pappus very fine and capillary ; corolla glabrous.—
Chrysocoma dracunculoides, Pursh ! jl. 2. p. 517, excl. char., which
chiefly relates to L. punctata. C. graveolens, Nutt. ! gen. 2. p. 136. Bige-
lowia dracunculoides, DC. prodr. 5. p. 329. Chrysothamnus dracunculoides,
Nutt, in trans. Amer.phil soc. 1. c. p. 324.
(3. leaves and the outermost scales of the involucre, as well as the branches,
more or less tomentose-pubescent.—Chrysocoma nauseosa, Pursh, l. c.?
Bigelowia Missouriensis, DC. 1. c. Chrysothamnus speciosus, Nu tt.! in
trans. Amer. phil. soc. 1. c. (excl. var. /?.)
On the denudated banks of the Missouri, Platte, &c. Lewis! Nuttall! and
plains in the -Rocky Mountains, -Nuttall ! Aug.—Shrub 3—5 feet high, with
a heavy and unpleasant, though somewhat aromatic odor; with numerous
virgate branches, like the common Broom. Flowers abundant, brilliant
yellow. Nutt.—Heads narrow, nearly half an inch long. Corolla a little
longer than the fine and scarcely scabrous, unequal and copious pappus,
slightly dilated upwards ; the lobes about one-fifth the length of the undivided
portion. Stamens inserted low down in the tube. Appendages of the style
linear-subulate, longer than the stigmatie portion. Leaves 2-3 inches long,
about a line wide.
6. L. albicaulis: stem and branches densely lanate-tomentose, white;
leaves very narrowly linear, tomentose-pubescent (at length glabrous?),
1-nerved; tube of the corolla beset with very fine long villous hairs!—
Chrysothamnus speciosus /3. albicaulis, Nutt. 1. c. Chrysocoma nauseosa,
Pursh, l. c. 1
Rocky Mountain plains near Lewis River &c., Nuttall!—Resembles the
preceding very perfectly, except in the characters pointed out. Mr. Nuttall
remarks that it is perhaps a distinct species ; without noticing, however, the
character upon which we should chiefly rely for distinguishing them; viz.
the long cobwebby hairs of the corolla.
7. L. viscidiflora (Hook.): shrubby, glabrous; leaves narrowly linear,
1-nerved, rigid, very acute ; heads more or less clustered, fastigiate-corym-
bose, 5-flowered ; scales of the oblong involucre glabrous, often glutinous, oblong
or oval, carinate-concave, few, rather loosely imbricated in about 3
series ; the exterior very short; corolla glabrous.—Hook. Jl. Bor.-Am. 2. p.
24, under Crinitaria. Bigelowia viscidiflora, DC. prodr. 7. p. 279.
/3. “ involucre ovate, the scales ovate and short.”—Chrysothamnus pumi-
lus (3. enthamioides, Nutt. 1. c.
y. dwarf, much branched from the base, minutely pulverulent-pubescent
or nearly smooth.—Chrysothamnus pumilus, Nutt.! 1. c.
Barren plains of the Oregon, from the Great Falls to the Mountains, &c.
Douglas! Lewis River and plains of the Rocky Mountains, Nuttall /—The
plant described by Hooker is said to be a common shrub, 2-4 feet high, in the
region where Mr. Nuttall obtained his Chrysothamnus pumilus: the latter
is called a low shrub, about 6 inches high, and described as either glabrous
or pulverulent-pubescent, with the involucre either smooth or glutinous ; so
that nothing of any consequence is left to distinguish it from Hooker’s plant,
of which we have seen no specimens. The heads are much smaller than in
the preceding; the pappus of firmer hairs, and more scabrous; but the habit
and structure of the plant nearly the same.
X Doubtful Species.
8. L . ? humilis (Hook., under Crinitaria): branches sparsely and slightly
hirsute; leaves linear-lanceolate, denticulate-ciliate, mucronulate-acute;
heads axillary and terminal; scales of the glabrous involucre linear; the exterior
larger and foliaceous. Hook. 1. c. . - . , .
Banks of the Saskatchawan, Drummond.—Plant 3-4 inches high, ot
doubtful genus.
42. AMMODIA. Nutt, in trans Amer. phil. soc. {n. ser.) 7. p. 321.
Heads many-flowered; the flowers all perfect and tubular. Scales of
the campanulate involucre scarious-membranaceous, linear or lanceolate,
1-nerved, imbricated in few series; the innermost as long as the disk, the
outermost short, appressed. Receptacle flat, alveolate-toothed. Branches of
the style subulate-filiform, the appendages longer than the flat stigmatie portion.
Achenia oblong-linear, attenuate, fusiform, or somewhat compressed,
pubescent. Pappus of copious minutely scabrous capillary bristles.—A
perennial branching somewhat hairy herb, with the habit and appearance of
Inula viscosa! exhaling a heavy odor. Leaves alternate, oblong, entire,
veiny, sessile. Heads irregularly paniculate-corymbose : peduncles somewhat
glandular; the pale yellow flowers nearly hid in the copious white
pappus.
A . Oregana (Nutt.! 1. c.)
On the sand and gravel bars of the Oregon and its tributaries, common,
Nuttall! Aug.—Stems a foot high, many from the same root. Heads as
large as in Inula viscosa. Flowers all similar ; the corolla slender, slightly
dilated upwards, 5-toothed. Anthers not caudate.
43. MACRONEMA. Nutt, in trans. Amer. phil. soc. (n. ser.) 7. p. 322.
Heads many-flowered ; the ray-flowers 6-8, ligulate, pistillate, or none ;
those of the disk tubular, perfect. Scales of the involucre, few, loose, somewhat
in 2 series, nearly equal, linear-lanceolate, 1-nerved; the exterior
mostly with foliaceous spreading tips, commonly with one or more foliaceous
bracts at the base resembling the upper leaves. Receptacle flat, areolate.
Corolla of the disk somewhat dilated above, 5-toothed. Branches of the
style much exserted ; the appendages of the style (in the disk-flowers) elongated,
subulate, hirsute, much longer than the linear flat stigmatie portion.
Achenia large, much compressed, when mature longer than the pappus of
copious somewhat unequal scabrous capillary bristles.—Low and viscidly
pubescent much branched shrubby plants (natives of Oregon); the fastigiate
leafy branches terminated by solitary rather large heads. Leaves alternate,
lanceolate, entire, sessile. Flowers yellow.
§ 1. Heads radiate : achenia pubescent.
1. M. suffruticosa (Nutt.! 1. c .): leaves oblong-linear or lanceolate, acute,
somewhat narrowed towards the base ; scales of the involucre mostly appen-
diculate; achenia oblong or slightly obovate, flat, 1—3-nerved on each side.
Sandy and gravelly banks of the Malade, a stream of the Oregon, near