140 LEAFLETS OF PHILIPPINE BOTANY [Vor. I, ART. 4 
culate in the leaf axils, disciform; outer flowers very numerous, 
fertile, slender corolla tube inflated below; disk flower tubular; 
corolla 4-cleft; involucre in several series, ovate and obtuse, 
ultimately becoming incurved; receptacle naked; anther bases 
entire; style arms bifid; achenes subcylindric, ribbed, without 
pappus. 
Species 1; in India and on Siam. 
1. S. russeliana DC. in Deless, Ic. Sel. 4; t. 49, 1839; 
Prod. 6; 140, 1837. Hook. Fl. Brit. Ind. 3; 317, 1881.—A 
much branched, sparingly introduced weed. Leaves punct- 
ate beneath, sessile, somewhat fleshy, glabrous or sparsely 
strigose, obovate, irregularly toothed. Heads usually in pairs 
from the leaf axils, one sessile the other pedunculate, more 
or less flattened; bracts chiefly glabrous, very unequal, per- 
sistent and closely set; flowers pale yellow; achenes rarely 
pubescent, but usually dotted with glistening glands. 
In the Philippines this species occurs along the waysides 
in the turf forming grasses. Some authors place it under 
Centipeda from which it is distinguished by the unequal 
involucral bracts arranged in several series. 
DisTRIBUTION: 
On Siam and in India. 
Luzon: 
Caloocan, Province of Rizal, November 1903, Merrill 3655. 
48. ARTEMISIA LINN. 
Odorous herbs or shrubs, with alternate leaves. Heads 
heterogamous or homogamous, small, pendulous or erect, 
either in spikes, racemes or panicles; involucre oblong or 
hemispherical, its bracts imbricated; receptacle flat or convex, 
naked or pubescent; marginal flowers usually pistillate, their 
corollas 2 to 3-toothed; central flowers perfect, sometimes 
sterile; in some species all the flowers are perfect and fertile; 
anther entire at the base, often tipped with subulate ap- 
pendages; achenes oblong 2-ribbed, usual with a pronounced 
disk; pappus none. 
