F'^A«o- COMPOSITE. 



399 



37. FILAGO. Tourn. ; DC. prodr. 6 » 247 



, v^. jj,uu.,. o. p. ztt. COTTON ROSE. 



[ From Ihe Latin, JUum, a thread ; the plant being covered with fine cobweWilie threads.] 

 Heads many-flowered, heterogamous ; the central flowers tubular, 4 - 5-tootlied, perfect, but 

 often infertile; the others pistillate, filiform. Scales of the involucre few, the extlrior 

 mostly woolly. Receptacle elongated or turb'inate, chaffy at the base, naked at the summit. 

 Pappus of the central flowers capillary ; of the exterior caducous or none. Achenia nearly 

 terete.— Annual woolly herbs, usually branched. Leaves alternate, entire. Heads glome- 

 rate or fascicled. 



1. FiLAGO Germanica, Linu. Herbalmpia. 



Stems dichotomous ; the branches arising from the base of the capitate glomerules ; leaves 

 lanceolate, acute ; heads pyramidal ; involucral scales cuspidate ; the exterior pistillate'flowers 

 m several series, destitute of pappus. — Linn. sj,. ed. 2. p. 1311 ; DC. prodr. 6. p 247 • 

 Torr. 4- Gr. fl. N. Am. 2. p. 432. Gnaphalium Germanicum, Linn. sp. (ed. 1.) 2. p. 857- 

 Engl. hot. t. 2369 ; Pursh, fl. 2. p. 526 ; Torr. compend. p. 289 ; Beck, hot. p 178 ■ Dar- 

 lingt. fl. Cest. p. 493. ' 



Stem 3-8 inches high, at first simple and bearing a terminal cluster of heads, but at lentrth 

 more or less branched, clothed (like the leaves) with a woolly tomentum. Leaves about 

 three-fourths of an inch long, numerous, erect. Heads crowded in small roundish or ovoid 

 clusters. Scales of the involucre straw-colored or tawny. Receptacle small, turbinate, 

 tuberculate. Achenia minutely papillose. 



Dry fields and slerile lull-sides. Staten Island. August - September. Introduced from 

 Europe. 



Subtribe VI. SENECI0NE.E, Cass. Heads homogamoUs or heterogamous, never dicecious, 

 discoid or radiate ; the rays ligulate, in a single scries. Receptacle scarcely ever chaffy. 

 Anthers not caudate. Pappus capillary, rarely wanting in the exterior flowers. 



CONSPECTUS OP THE GENERA. 

 ♦ Hewh dUcM, heterogamous ,- ihc flowers all tubular. 



38. EBEcnriTES. Marginal flowers pbtillate, very slender, 2 - 3-toothcd. 



•• Heads homogamcnts, or heterogamous and radiate. 



39. C.CAL.A. Head, discoid, 5 - many-flowered. Achenia smooth. Pappus rough. Flowers white or whitish- 



J_,oavc8 allfrnatc. 



40. S«Nr.c,o. Heads radiate or discoid, many-flowered. Pappus of very slender bristles. Keceptacle flat or convex 



1? lowers mostly yellow. — Leaves alternate. • >.uuvii, 



41. AmN.c*. Head, radiate, many-flowcrcd. Pappus barbellate or strongly denticulate, rather r -id. Receptacle flat 



— L^ftvei opposite, ' 



