542 LXII. COMPOSITR. [Spilanthes. 
florets short and broad. Style-branches very long, flat, truncate. Achenes 
acutely edged or winged without cilia, the awns rather long for the genus. : 
N. Australia. Islands of the Gulf of Carpentaria, R. Brown, Henne. Also in 
Borneo, Barber. 
35. GALINSOGA, Cav, 
(Vargasia, DC.) 
Involucre of few (about 5) broad nearly equal bracts. Receptacle conical, 
chaffy, the scales narrow. Ray-florets few, female, ligulate. Disk-florets 
hermaphrodite, tubular, 5-toothed. Anthers obtuse at the base. Style- 
branches acute. Achenes angular, slightly flattened. Pappus of several 
linear or oblong chaffy scales often plumose-ciliate or wanting, especially on 
the achenes of the ray.—Herbs with opposite leaves. Flower-heads small, 
pedunculate. Ray white, 
genus from tropical and subtropical America, of which one species has spread as 
a weed of cultivation over many warm and temperate districts of the Old World, and has 
become introduced as such into Australia. 
*1. G. parviflora, Cav. ; DC. Prod.v.677. An erect annual of A 
2 ft., glabrous or slightly hairy. Leaves petiolate, ovate or ovate-lanceo : e. 
Peduncles slender. Involucre nearly hemispherical, about 2 lines diameter. 
Ray-florets about 5, with a small white ligula. Disk-florets short. rn 
small, slightly hairy, Pappus of the ray reduced to a few minute bristles 
. entirely wanting, that of the disk-achenes consisting of from 12 to 20 chaffy 
scales, more or less plumose-ciliate. i 
. S. Wales. Port Jackson, Woo/ls; Clarence river, Beckler. A South Amer 
species, introduced with cultivation, 
36. BIDENS, Linn. 
ay-florets neuter, sterile, ligulate or sometimes wanting ; 
lar, hermaphrodite, 5-toothed. Anthers obtuse at the base. 
with an acute or subulate point. Achenes broat and flattened o 4 iid fe 
4-angled, often produced into a short beak. Pappus of 9 to vex heads 
trorsely hispid persistent awns.— Herbs with opposite leaves. Flow 
on terminal peduncles, the ray yellow or white. te 
Of the two sections of the genus one, Platycarpea, belongs chiefly to bs ho up 
regions of the northern hemisphere, the Australian species being identical vis exception of 
common northern ones; the other, Psilocarpea, is entirely American with the 
the two Australian species, which are common weeds i 
_ Section I. Platycarpsea.— 4AcAenes flat and rather broad. 
Leaves divided into 3 lanceolate serrate segments... s+ e ott 
_ Section II. Psilocarpzea.—Achenes slender, 4-angled. 
Leaves mostly pinnate, with 3 or 5 segments, Ray white . . - - 
Leaves PNMUNGNA Ray yellow . . 7 v vue os on 
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