AvausT 16, 1906] MANUAL OF THE PHILIPPINE COMPOSITAE 173 
DISTRIBUTION: 
Southwestern United States. 
Luzon: 
Pasacao, Province of Camarines, November 1903, Mer- 
rill 3367. 
LEYTE; 
Polo, January 1906, Elmer 7039. 
39. DAHLIA CAY. 
Nonaromatic perennial herbs, with opposite 1 to 3 
pinnately dissected leaves and nodulose roots. Heads het- 
erogamous; the outer flowers ligulate, the inner ones tubular 
and 5-toothed; involucre 2-seriate; exterior bracts foliaceous, 
inner ones membranous and united at the base; receptacle 
plane, bearing thin oblong scales; style arms erect or recury- 
ed; anthers eucaudate or appendiculate; achenes oblong, 
without pappus. 
Species 9; mostly Mexican. 
1. D. coccinea Cay. Ic. 3; 33, t. 266, 1794. DC. Prod. 
5; 494, 1836. F. Vil. Nov. App. 118, 1880. D. cervantesii 
Lag. in F. Vil. Nov. App. 118, 1880. D. variabilis Desf. in 
F. Vil. Nov. App. 118, 1880.— Profusely and delicately branch- 
ed pot herbs with glaucous stems. Leaves opposite, pet- 
ioled, 2 to 3-pinnate, subglaucous, its lobes ovate to 
lanceolate, dentate. Heads solitary, showy; outer series of 
bracts herbaceous, becoming reflexed, inner ones broader and 
exceeding the outer series; ligulate flowers neutral, usually 
purple. 
Although we have no reference specimens on hand, it is 
known that Dahlias have been introduced from Mexico and 
are grown here as pot plants for their beauty. None of them 
seem to have been reported from the other Oriental countries. 
40. BIDENS LINN. 
Annual or ‘perennial herbs, with opposite serrately lobed 
or dissected leaves. Heterogamous heads, quite large, with 
ligules showy or rudimentary; involucre hemispheric, its 
