370 LXXIII. COMPOSITH (OLIVER AND HIERN). [ Odontospermum. 
lucral bracts pauciseriate, ovate or linear, unequal ; the inner ones dry; 
the outer herbaceous or foliaceous. Receptacle slightly convex, fur- 
nished with oblong pales nearly as long as the florets, the outer pales 
subtending the florets, the inner semi-cylindrical, embracing the florets. 
Ligules 2-3-dentate. Corolla of the disk-florets tubular, acutely 
5-lobed. Anthers sagittate at the base, appendaged with long linear 
auricles. Style-branches somewhat compressed, rounded and pot 
dilated at the apex. Achenes costate; those of the ray somemhat 
compressed or trigonous; those of the disk subterete. Pales an e 
pappus numerous, distinct, scarious, cut towards the apex, eqnaling 
the ovary.—Tough herbs or undershrubs, with alternate toothed o 
entire leaves and solitary heads terminating the lateral and termina 
branches. 
A genus of about 8 species ranging from the Levant to the Cape de Verde 
Islands. 
1. O. graveolens, Schultz Bip. in Webb et Berth. Phyt. Canar. u. 
p. 232. Shrabby, much-branched, ranging up to 1} ft. high. te 
ches rigid, whitish, obsoletely velvety. Leaves pinnately lo en " 
remotely toothed, often mucronate, sessile, more or less narrowed abov' 
the cordate-amplexicaul base, hoary, viscid or shortly hairy, vanes 
up to 2 in. long. Capitula hemispherical, terminal and_ subsessile 
the forks of the lateral branches, 3-4 in. diameter, usually involuera , 
with 1-3 floral leaves at the base. Involucral bracts ovate, puberu one 
the outermost linear, mucronate or apiculate, foliaceous. oe 
yellow ; ligule acutely toothed at the apex, shortly exceeding the v . 
Achenes hairy on the ribs.—Buphthalmum graveolens, Forsk. #1. 
Aigypt.-Arab. p. 151 (1775). Asteriscus graveolens, DC. Prodr. v. Pp. 
486 (1836). 
North Central. Middle Soudan, Beurmann, fide Schweinf. Ber. Beurm. Pf. in 
Zeitschr, Allg. Erdk. xv. p. 300 (1863). 
Occurs also in Egypt and Arabia. 
53. AMBROSIA, L.; Benth. et Hook. f. Gen. Pl. ii. p. 354. 
Capitula unisexual ; of male florets small spicate or racemose, cee d 
flowered, with a broadly hemispherical gamophyllous shortly _ t . t 
herbaceous involucre ; receptacle nearly plane, with or nearly wit oe 
filiform palew ; female capitula sessile or clustered in the upper 2%! 3 
1-flowered, apetalous. % corolla white, regular, 5-fid ; anthers ir 
nearly so, base entire. ¢ involucre ovoid or subglose, closed ied ; 
achene, usually with 4-6 tubercles or short spines, narrowed Mer. 
into a short beak.—Herbs or frutescent, more or less hairy with alte 
nate (or opposite) bipinnately divided leaves. 
A small widely diffused genus of warm countries. 
1. A. maritima, Linn. Sp. Pl. ed. i. p. 988. A coarse annual, 
woody below, 1-3 ft. high, whole plant usually very hairy and aerd 
much-branched. Leaves ovate, bipinnatipartite, 1-3 in. long; id 
ments obtuse, sometimes toothed. Capitula subsessile, 2-2 in. diameters 
ee 
