6. elatior: leaves as in y.\ the lobes entire ; heads as in /?., smoothish, in
numerous more or less elongated racemes, forming an ample virgate-
pyramidal panicle.—A. vulgaris, Bess, t in Hook. 1. c., in part. A. Indica /?.
Canadensis, Bess. 1. c. 1 A. vulgaris /3/3. Americana (as to the Northern
plant), Bess, in Linncea, 15. p. 105.
Arctic shores of Asia and America ! toUnalaschka ! <5. Subarctic America,
Richardson !—A polymorphous plant, with larger (frequently 3 lines in diameter),
more globose and racemose heads, and more scarious involucres than
any form of A. vulgaris.
21. A. Hookeriana (Bess.): suff’ruticose, erect: leaves with their lower
surface as well as the stem canescent; the cauline pinnatifid, their lobes, like
the floral leaves, lanceolate, acute; heads globose, nodding, in a terminal
thyrsoid and scarcely leafy panicle; scales of the involucre woolly, with scarious
margins ; the inner rounded. Bess, in Hook. 1. c., Sf DC. 1. c.
Rocky Mountains, Drummond.—Heads 1 |—2 lines long. Corolla purplish.
Resembles a form of luxuriant A. vulgaris. DC.
22. A . Michauxiana (Bess.): herbaceous, erect; stem simple ; leaves
whitish-tomentose beneath, pinnatifid ; the lobes of the lower ones incisely
toothed, of the upper and also the floral leaves linear-lanceolate; heads racemose,
globose, nodding; scales of the involucre glabrous, with the sides scarious
and shining; corolla glabrous. Bess, in Hook. 1. c., Sf DC. 1. c.
Rocky Mountains, and on the Oregon, Douglas.—Plant with the aspect of
A. vulgaris var. Mongolica. Raceme sometimes simple, sometimes branched
at the base. DC.
23. A. incompta (Nutt.): herbaceous, glabrous, except the lower surface
of the pinnatifid leaves, which is cinereous ; their lobes (3-5) linear-oblong,
entire (the lateral sometimes toothed ?); heads subglobose, racemose-paniculate,
erect, on short pedicels : scales of the involucre glabrous and shining,
scarious; the exterior ovate; corolla glabrous.—Nutt.! in trans. Amer. phil.
soc. 1. c. p. 400.
Central chain of the Rocky Mountains, in Thornberg’sPass (about lat. 41°),
Nuttall 1—Plant 1-2 feet high. Remarkable for its smoothness ; at first sight
somewhat resembles some varieties of A. vulgaris, but is very distinct. Nutt.
—Perhaps the same as the preceding, which is unknown to us.
24. A . pachystachya (DC.): suff’ruticose (herbaceous, Nutt.), woolly-sericeous
throughout; stems simple; cauline leaves crowded and also fascicled in
the axils, bipinnately divided, or simply pinnate and as if stipulate at the
base; the lower pinnae scattered, those at the apex crowded; lobes short,
narrowly linear-lanceolate; heads subglobose, glomerate-spicate; the spikes
crowded in a long spicate panicle, bracteate at the base; scales of the involucre
ovate, villous on the back; the inner scarious; corolla glabrous.—
DC .! prodr. 6. p. 114; Nutt, in trans. Amer. phil. soc. 1. c. (under the
name of A. pycnostachya.)
California, Douglas! Coast of Monterey, Nuttall.—The crowded panicle
1-2 feet long, composed of short sessile spikes. Heads 15-20-flowered.
25. A. Richardsoniana (Bess.); c ass pilose; leaves somewhat silky [canescent]
; the radical on long petioles, and with the lower cauline pinnately divided
; the upper 3-cleft; lobes of the radical leaves 3-5-cleft, of the upper
undivided, linear, obtuse; heads racemose-spicate, glomerate, globose; peduncles
woolly at the summit; scales of the involucre fuscous, scarious,
woolly on the back; corolla a little hairy at the summit (varies with the peduncles
strict, and with the heads somewhat nodding). Bess.! in DC. prodr.
6 .p. 117. A.. arctica, Bess.! in Hook. Jl. Bor.-Am. 1. p. 323, not of Less.
A. csespitosa, Bess, in Hook. 1. c. ?
From Bear Lake to the shores of the Arctic Sea, Richardson ! Mt. Ranier,
Oregon, M r . Tolmie !—Plant 4-6 inches high. The corolla is nearly glabrous
in our arctic specimens, but decidedly hairy at the summit in that from
Mount Ranier; in which the raceme is loose, the pedicels strict, but the
heads a little nodding.
26. A . Prescottiana (Bess.): suff'ruticose, branched ; leaves canescent beneath,
with revolute margins, pinnatifid or trifid; the divergent lobes and
uppermost leaves linear-filiform; heads spicate, globose, nearly erect; scales
of the involucre with scarious margins, shining, scarcely pubescent; corolla
glabrous. Bess, in Hook. 1. c., Sf DC. 1. c.
Oregon, D o u g la s .—Lower leaves 1-^—2 inches long. D C .
27. A . arctica (Less.): herbaceous; stem simple ; leaves nearly glabrous;
the lower bipinnatifid, (petioled); the lobes linear-lanceolate, incisely toothed ;
heads large, globose, racemose, nodding; the apex of the peduncles and the
base of the corolla hairy; scales of the involucre ovate-lanceolate, scarious,
brown or blackish. DC.! 1. c.—Less.! in Linncea, 6.p. 213; Hook. Sf Am . !
lot. Beechey,p. 125; not of Bess. A. Chamissoniana, Bess.! in Hook.fi.
Bor.-Am. 1. p. 324.
Arctic coast, Richardson ! to Kotzebue’s Sound! and Unalaschka ! Woods
in the Rocky Mountains, lat. 52°, Drummond.—According to Hooker, the
specimens from the last-named locality are identical with A. Norwegica.
28. A. glomerata (Ledeb.): suff’ruticose, caespitose, silky with white hairs ;
leaves on the simple tufted stems 3-parted and many-cleft; the upper cauline
and the bracts cuneiform or oblong, pinnatifid; heads corymbose-capitate,
globose, bracteate ; scales of the involucre ovate-lanceolate, sphacelate, unequally
toothed at the apex, whitish on the back; corolla hairy only at the
summit. DC.! l.c.—Ledeb. in mem. acad. St. Petersb. 5. p . 564 ;
Less. ! in Linncea, 5, p. 212 ; Bess.! in Hook. 1. c.
Kotzebue’s Sound, fide H o o k . 8f A m .! lo t. Beechey, p . 125: but we
doubt whether the sterile tufts (which alone were collected), with densely
imbricated, very villous, cuneiform, 3-5 cleft leaves, really belong to this
species.
29. A. g lo b u la ria (Cham, herb.): suff’ruticose at the base, csespitose ; stems
simple, hirsute at the summit; leaves petioled, silky beneath, 3-parted ; the
lobes 3-cleft or entire, linear ; heads racemose-capitate, globose; scales of the
involucre oblong-lanceolate, woolly on the back, sphacelate at the apex;
corolla glabrous.—B ess, in D C . p r o d r . 6. p . 116.
Unalaschka, &c., Chamisso!—Stems 3—5 inches long from a woody
caudex. Involucre blackish. Corolla purple. D C .
* * Biennial.
30. A. biennis (Willd.): herbaceous, strict, glabrous; radical and lower
cauline leaves bipinnately parted ; the uppermost pinnatifid ; the lobes linear,
acute; those of the lower leaves sharply toothed or incised, of the upper
mostly entire; heads globose, erect, spicate; the short spikes disposed in a
strict leafy panicle.— Willd. spec. 3. p. 1842 ; Pursh! fl. 2. p. 522 ; Nutt. !
gen. 2. p. 144 ; Bess. ! in Hook. 1. c .; DC. ! prodr. 6. p. 120. A. annua ?
Nutt. 1. c.
Ohio! Illinois! Tennessee! and Missouri! to the Upper Platte! Sas-
katchawan ! and the Mackenzie River! Aug.-Oct.—Plant 1-3 feet high.
§ 5. Receptacle villous (or naked?): heads as in § Abrotanum: achenia
acutely ribbed, crowned with a minute squamelliform pappus!—T anaceum,
Nutt.