hairy; pappus of the ray composed of nearly equal subulate setaceous bris-
305 the achenmm— ■Nutt- • ™ trans. Amer. phil. soc. 1. c.
a W ao ■h\ S°U,rCef ° ^ the ,PlaMe in the Rocky Mountains,about 2 inches high densely csspitose and depressed, inclin eNdu tlot apllr o/d-Puclea dnit
chotomous stems. Leaves about half an inch long, indistinctly petioled.
witb hrnniri61 *han ’ se" cea- Scales of the involucre silky-pubescent,
with broad scanous and conspicuously fimbriate-ciliate margins. Rays not
dkk?buteShorter ’ ^ UlaC; the P W resembling that of the
§ 2. Root perennial: pappus deciduous in a ring ; that o f the scarcely ex-
serted fertile rays equalling that of the disk— Urophorus, Nutt.
Ip«™«2} sPa! hf lata (Nutt- ! }■ c .) : densely caspitose; eaudex branched;
tbpT spatulate or obovate, silky-villous, narrowed into a petiole as long as
the limb, crowded, and nearly enclosing the (small) sessile heads; scale! of
the involucre lanceolate, acute, scanous ; receptacle somewhat alveolate.
• ^ ? aC.k W the P latte, with the preceding, Nuttall!—Plant 1-3
inches high. Achema oblanceolate, margined, slightly pubescent on the
disk, and usually naked by the escape of the deciduous (barbellate) pappus,
Ismimiill a!rr,1 Sttbhpe prthesee nCft Speila11n3 ta pDryo,b0afJblyh ec oPnrestcietuditleJsg -a n Talhlioeudg ghe tnhues .”h aNb uittjt— neaOrulyr
h«tC= T niS f / e t0° °}d> ?nd have lost their achenia as well as pappus. Per-
mature6 1S ^ deciduous ln the °ther species, when the fruit is fully
§ 3. Root annual, thickened at the summit, and producing depressed branching
stems: rays pistillate hut infertile; the shortpappus composed of lacerate-
denticulate squamellts, often somewhat united at the lase.—Nanas trum.
(Subgen. Nanodia, Nutt., not of Banks.)
4‘ T ‘ strjg osa (Nutt.! 1. c .): depressed; leaves strigose-canescent, linear-
spatulate; the uppermost often involucrate around the base of the slightly
pedunculate heads; scales of the involucre lanceolate-oblong, fimbriate-cili-
olate ; ray s l 2-14 (rose-color), short; achema minutely pubescent.
Black Hills, near the banks of the Platte, Nuttall! June— Plant 2-4
inches high. Heads scarcely as large as in T. sericea. Scales of the involucre
scanous, except the greenish line in the centre. Pappus of the ray
barely visible to the naked eye, composed of a single series, of squamell®,
somewhat united or coroniform. * ’
, 5‘ T ' g™ndiflora (Nutt.! 1. c .): divaricately branched from the base ; the
branches depressed, often proliferous; leaves scattered, linear-lanceolate,
acute, minutely pubescent; the uppermost bracteate at the base of the (large)
heads ; scales of the involucre narrowly lanceolate, subulate-acuminate, with
S y T a i r y °late margmS; rays 25_30> elongatcd (pale lilac); achenia mi-
Black Hills, and plains of the Upper Platte, Nuttall! Dr. James ! J u n e -
Central stems short, erect, bearing a single head; the lateral decumbent, extending
5 to 10 inches along the ground, often branching and bearing 3 or 4
heads. Leaves 1-2 inches long, somewhat succulent; the cauline alternate.
Heads nearly as large as those of the China Aster. The plant well deserves
cultivation, from its large showy flowers.” Nuttall— The pappus
is very similar to that of the preceding species. y
30. CHiETOPAPPA. DC. prodr. 5. p. 301. (1836.)
Chaetanthera, Nutt., not of R u iz <f- Pavon.—Chsetophora, Nutt, in herb. DC., not of
Agardh.—Diplostelma, Raf. (1836.)
Heads about 20-flowered; the ray-flowers 8-12, pistillate, in a single series
; those of the disk tubular, perfect; the central mostly infertile or abortive.
Scales of the involucre about 12, lanceolate, acute, rigid, with scarious
margins, loosely imbricated in 2-3 series, carinately 1-nerved; the outermost
shortest. Receptacle narrow, naked. Rays linear-oblong; the corolla of
the disk infundibuliform-tubular, 5-lobed. Style somewhat included; the
branches short, very obtuse. Achenia nearly terete, somewhat fusiform, 5-
striate, slightly hairy. Pappus of the ray and fertile disk-flowers similar,
double ; the exterior of 1-5 very small hyaline scales ; the interior of 5 rigid
scabrous bristles nearly the length of the corolla: that of the central mostly
infertile flowers simple and similar to the exterior pappus of the fertile
flowers, or coroniform, the bristles wanting.—A small annual herb (4-10
inches), diffusely branching from the base, minutely strigose. Leaves alternate,
entire ; the radical and lowermost obovate-spatulate, tapering into a petiole
; the upper linear. Heads terminating the branchlets, solitary or loosely
paniculate. Flowers of the ray pale purple or white.
C. asteroides (DC.! 1. c.)—Chaetanthera asteroides, Nutt.! in jour. acad.
Philad. 7. p. 111. Chsetophora asteroides, Nutt. ! in herb. DC. Asteridi-
um ramosissimum, Engelmann! mss. in herb. Berol.
Prairies and naked places, Arkansas, Nultall! Dr. Engelmann! Dr.
Leavenworth ! to Texas, Drummond! March-May.—Heads about the size
of those of Erigeron Canadense. Involucre turbinate-feampanulate, glabrous.
Rays elongated, convolute when dry ; the tube slender.—We have described
this plant somewhat differently from either Nuttall or De Candolle. The
pappus of the ray and of the exterior perfect flowers is absolutely similar in
all our specimens; but several of the central flowers, although perfect, are
smaller and apparently always infertile; in these the inner pappus is wanting^
and the exterior often only rudimentary and coroniform. The plant
begins to flower when the stems or branches are about 2 inches high: later
in the season it branches very much, and the numerous heads are borne on
Setaceous divaricate peduncles.
31. BOLTONIA. L'Her. sert. Angl. p. 27; DC. prodr. 5. p . 301.
Heads many-flowered ; the ray-flowers pistillate, in a single series; those
of the disk tubular, perfect. Scales of the hemispherical involucre imbricated
somewhat in 2 series, appressed, scarcely the length of the disk, with somewhat
membranaceous margins. Receptacle hemispherical or conical, obscurely
alveolate. Branches of the style linear-oblong, with very short appendages.
Achenia compressed, flat, obovate or slightly obcordate, margined
with a callous wing, in the ray often 3-winged, glabrous or sparsely and minutely
hispid. Pappus of several minute setose bristles, and frequently with
2 (or sometimes 3-4) more or less elongated subulate awns.—Perennial gla