Bidens. — Flaveria. — Tagetes. 999 
flowers yellow. Ligule of the ray-flowers white, sometimes wanting. 
Achenes slender elongated and gradually tapering towards the apex, 
glabrous setulose or minutely tubercled, those of the disk 5—7 mm 
long, the outer ones shorter, not or scarcely compressed, obtusely 
quadrangular, tipped with 4—2 spreading retrorsely barded strong 
setae. Receptacle shortly alveolate. — Flow. March to April. 
M. ma. Mariut; Montaza; Alexandria-West and -East; Mandara; 
Abukir. — N.d. N. v. Often on borders of irrigation canals, way- 
sides and in waste places. — D.i. Ismailia. 
A common weed, probably of American origin, widely spread over most 
hot countries. 
¢ 
575. (35.) Flaveria Juss. 
Heads one or several-flowered; all the flowers fertile, homo- 
gamous and tubular, or one female and short-ligulate. Disk corollas 
5-toothed. Involucre of 2—5 mostly carinate-concave bracts. Pappus 
none. — Glabrous herbs, mostly annuals; with small and fascicled 
or glomerate heads or yellowish or yellowish flowers, and opposite, 
sessile leaves, the broader ones 3-nerved. Achenes mostly smooth 
and glabrous. 
A small genus, mainly tropical American. 
1378. Flaveria Contrayerba (Cay.) Pers. Synops. Plant. (1805), 
p. 816. — Aschers.-Schweinf. Ill. Flor. d’Eg., p.89 no. 554, — 
Sickenberg. Contrib. Flor. d’Eg., p. 246. — Rather slender, 30—60 cm 
high, rarely more. Leaves oblong-lanceolate, contracted at the base 
and conspicuously 3-nerved. Heads in closer subsessile or short 
pedunculate or foliose-involucrate chiefly terminal glomerules; 
involucre of mostly 3-bracts, narrow, 3—5-flowered, commonly 
uniligulate; ligules not exceeding the disk or sometimes wanting; 
disk-corollas sparsely hirsute at the base. — Flow. February to April. 
N. d. Alexandria; Qabary; Mensall. — D. i. Desert-el-Tih. 
Local name: ward asfer (Ascherson). 
Also known from Tropical America, where it is originally. 
576. (36.) Tagetes Linn. 
Involucral bracts in a single row, united in a toothed cup or 
tube. Receptacle flat, without scales. Flowers of the ray female, 
ligulate; disk-flowers tubular, 5-toothed. Anthers obtuse at the base. 
Style-branches flattened, obtuse or truncate, usually hirsute. Achenes 
linear, flattened. Pappus of several narrow very unequal scales or 
bristles. — Herbs, usually glabrous, the foliage and involucres 
