5-cleft, regular; the lobes erect. Anthers not caudate. Style of the ray
short and simple, included within the tubular part of the corolla; that of the
disk 2-cleft at the summit; the branches included, linear, obtuse, slightly
and minutely hispid. Achenia obovate, scarcely angled, pubescent. Pappus
composed of elongated unequal acuminate chaff; the outermost rather
shorter and narrower.—An annual or biennial erect glabrous herb, with a
simple stem, loosely branched or corymbose at the summit; the branches
erect and leafy. Cauline leaves alternate, rather rigid (not dotted with
glands nor fringed with bristles), sessile, oblong or linear, 1-nerved, chiefly
entire, sometimes acutely serrate at the summit. Flowers yellow. DC.
X . Texanum (DC. L c.)
Texas, Berlandier; in woods.—Habit of Centaurea cerinthefolia. DC.—
This plant is wholly unknown to us : it is perhaps from the southern part of
Texas, and scarcely within the limits of this work.
5. PECTIDOPSIS. DC. prodr. 5 .p . 98.
Heads many-flowered; the flowers of the ray in a single series, ligulate,
pistillate; those of the disk perfect, tubular. Involucre cylindrical-campan-
u late ; the scales about 8, in a single series, somewhat conduplicate. Receptacle
naked. Corolla of the disk 5-toothed, regular. Branches of the
style semicylindrical, short. Achenia crowned with a very short scarious
minutely about 5-toothed and somewhat lacerate pappus.—A very small
annual herb, with the habit of Pectis, nearly glabrous, branching from the
base. Leaves opposite, narrowly linear, punctate with large pellucid glands,
somewhat connate at the base, near which the margins are fringed with a
few bristles. Heads on short peduncles terminating the branches. Flowers
yellow; those of the ray 7-8.
P. anguslifolia (DC. 1. c.)—Pectis angustifolia, Torr. ! in ann. lyc. New
York, 2. p. 214.
On the Rocky Mountains, in about lat. 41°, Dr. James!—Peduncles much
shorter than the leaves.
6. PECT IS. Linn. (excl. spec.); Less, in Linncea, 6. p. 708, 8f syn.
p . 153. DC. prodr. 5. p. 98.
Heads several-flowered ; the flowers of the ray in a single series, ligulate,
pistillate; those of the disk perfect, bilabiate. Involucre somewhat cylindrical
; the scales 5-8, in a single series, often involute or conduplicate. Receptacle
naked. Corolla of the disk bilabiate, (the two inner sinuses deeper
than the others); those of the ray ligulate, the ligule longer than the tube.
Branches of the style semicylindrical, short. Achenia striate. Pappus of
the disk and ray similar, in a single series, chaffy, mostly pointed with serrulate
(often unequal) bristles.—Mostly annual (tropical American) herbs.
Leaves opposite, connate at the base, 1-nerved, punctate with pellucid
glands ; the margin somewhat cartilaginous, and fringed with scattered bristles.
Heads on slender pedicels, or often sessile. Flowers yellow.
1 . P. linifolia (Linn.): stem diffusely branched; leaves linear, mucronate,
dotted with large glands, ciliate with bristles towards the base; heads on
slender minutely bracteolate pedicels, 4-18-flowered ; scales of the involucre
4-6, elliptical-lanceolate, equal, conduplicate, with broad scarious margins,
not glandular; pappus of rather broad chaff, mostly awned, the bristles in
the ray-flowers 2, equal, in the disk usually 5.—Linn, am an. acad. 5. p.
107, &f spec. ed. 2. p. 1250 ; Lam. ill. t. 684; Less. 1. c .; DC. prodr.
5. p. 99.
Key West, Mr. Bennett ! Mr. Blodgett!—A native of Jamaica, St.
Thomas, &c.
T ribe II. EU PA TO R IA C E ^ . Less.
Heads discoid, with the flowers all tubular and perfect (homogamous),
or sometimes heterogamous ; the ray-flowers either tubular or ligulate.
Style cylindrical above ; the branches usually much elongated, obtuse
or clavate, puberulent or papillose externally towards the sum m it; the
stigmatic lines inconspicuous, terminating near the middle of the
branches of the style, not confluent a t their termination. Anthers
never caudate.—Flowers mostly of the cyanic series (white, blue, or
purple). Leaves commonly opposite.
CONSPECTUS OP TH E GENEEA.
Subtribe 1. E cpatorie.®.—Heads discoid, homogamous.
Div. 1. A geratea;.—Pappus chaffy, aristate-squamellate, or coroniform.
7. Ccelestina. Pappus coroniform or cup-like.
8. A geratcm. Pappus of 5-10 distinct often aristate chaffy scales.
9. S clerolepis. Pappus of 5 obtuse corneous scales. Leaves verticillate.
Div. 2. A denostyle.®.—Pappus of slender or capillary bristles.
* Achenia striate or ribbed.
10. C arphbphorus. Receptacle chaffy. Pappus barbellate.
11. L iatris. Receptacle naked. Scales of the involucre not striate. Lobes of
the corolla elongated.
12. Clavigera. Receptacle naked. Scales of the involucre deeply striate. Teeth
of the corolla very short. Pappus plumose-barbellate.
13. K uhnia. Receptacle naked. Teeth of the corolla short. Pappus plumose.
14. Bulbostylis. Receptacle naked. Pappus scabrous. Heads 10-25-flowered.
15. Brickellia. Receptacle naked. Pappus scabrous. Heads 30-50-flowered.
* * Achenia 5-angled,, not striate. Pappas scabrous.
16. E upatorium. Receptacle naked, flat. Scales of the involucre numerous.
17. Mikania. Receptacle naked, flat. Scales of the involucre (and flowers) 4r-5.
18. Conoclinium. Receptacle conical, naked.
Subtribe 2. T tjssilagineje.—Heads with the flowers heterogamous, or dioecious.
19. Nardosmia. Heads corymbose, many-flowered, somewhat dioecious.
20. T ussilago. Head solitary, many-flowered, heterogamous ; the pistillate flowers
ligulate, in several series.
21. Adenocaulon. Heads few-flowered, heterogamous; the flowers all tubular.