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BIDENS striata.
Striped-flowered Bidens.
Natural Order. C o m p o s it a :. Adansonfam. 2. X03.
Subordo V I . HELUNTHEM. Kth. synops. 2. p. 463.
B ID E N S . Involucrum polyphyllum; foliolis duplici sene dis-
positis ; exterioribus s®pius longioribus, alius form® et patentibus.
Receptaculum planum, paleacenm. Flosculi disci tubulosi, lierma-
phroditi ; radii ligulati, neutri, rarius nulli. Akenia quadrangulari-
compressa, 2-5-aristata ; aristis persistentibus, retrorsum bamosis.-—
Herb® ramis foliisque oppositis, integris, incisis aut vane partiHs.
Flores terminates, solitarii aut corymbosi; radio sapissime flavo, rarius
albo. Kth. svnops. 2. p. 478.
Sect. I I . Foliis divisis ; akeniis subtetragonis.
B. striata, caule erecto ramoso, ramis pubescentibus, foliis ternatis :
foliolis oblongo-ovatis acutis serratis glabris niargine scabris ; tcr-
minali acuminato majore, radio albido purpurco-striato, akeniis
compresso-qnadrangularibus 1-2-aristatis ; aristis in»qualibus.
Stem erect, much branched, attaining the height of four
feet; branches unequally 6-angular, and striate between
the angles, clothed with a short pubescence, the angles
thickened and purplish. Leaves all ternate, or very rarely
a simple one near the top, petiolate: leaflets oblongly
ovate, acute, cuneate at the base, serrate, with rough margins
; smooth and glossy, and of a dark green on the upper
side; underneath paler and slightly pubescent, numerously
nerved, and reticulately veined: terminal one petiolate,
taper-pointed, the point entire, generally unequal at the
base, about twice as large as the side ones, and sometimes
more than that: side ones generally with short footstalks,
but sometimes sessile, also mostly unequal at the base,
nearly as broad as long. Petioles channelled on the upper
side and keeled on the lower, winged a little at the margins,
and clothed with long spreading hairs. Flowers terminal,
panicled. Peduncles angular, furrowed, pubescent, a little
thickened at the base of the flower. Involucrum manyleaved,
in two series, and of two different forms, but about
the same length: outer series consisting of from 8 to 10
leaflets, which are linear, acute, hairy, 3-nerved, and spread-
voL. ni. L
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