176 
45. COMPOSITE!. 
Tribe III. Senecionea. 
Style of perfect fl. cylindrical; branches long, linear, ending 
in a bunch of hairs or sometimes extending beyond the hairs 
into a short cone or appendage. Stigmatic lines broad and 
prominent and extending as far as the hairs. 
Section 1. HELIANTHEM. Heads discoid with all the 
fl. similar and perfect ; or rarely radiant with dissimilar flowers, 
/uith. without appendages. Receptacle scaly throughout or 
only near the margin. Cor. of the perfect fl. with thickened 
lobes. Pappus of a few bristles in our plants. 
11. (23.) Bi'dens Linn. 
1. H. trijmrtita (L.) ; I. stalked 3-partife, segments lanceolate 
serrate, fr. obovate-cuneate usually with 2 bristles. — K B. 1113. 
R. xvi. 941. — St. 1 — .3 feet high, with opposite branches. L. 
narrowed into winged footst;dks, sometimes imdivided, some- 
times piunate-5-tid. Heads temiinal, solitary, slightly drooping. 
Fl. brownish yellow. — Sometimes radiant 3-toothed marginal 
fl. are found.— Marshy places. A. Vlll. IX. E. S. I. 
2. B. cer'ima (L.); I. sessile connate lanceolate undivided ser- 
rate, fr. cuneate usually with 8 — 4 bristles. — JE. B. 1114. i?. 
xvi. 941. — St. 1 — feet high, with opposite branches. L. simple, 
narrowed below but not stalked. Heads temiinal, solitary, 
drooping. Fl. brownish yellow. — Sometimes radiant marginal 
fl. are found. — Watery places. A. VUI. IX. E. S. I. 
Section 2. ANTHEMIDEjE. Heads usually radiant, fl. of 
ray fem. or wholly ban-en. Anth. without appendages. Branches 
of the style truncate, bearded, very rarely ending in a cone. 
Pappus often wanting or crownlike, rarely formed of scales or 
slender hairs. 
12. (21.) Achille'a Linn. Yarrow. 
1. A. Ptar'mica (L.); /. shining linear-lanceolate, attenuate 
acute fflahrom smooth uniformhj and finely serrate, teeth adpressed 
miicronate minutely scabrous at the margin, ray 8 — 12-flowered 
equalling the involucre, corymb compound. — E. B. Ibl. B. xvi. 
1024. — St. about 2 feet high, slightly branched abo\ e, erect, 
leafy, angular, smooth. Pliyll. with a dark-brown membranous 
margin. Limb of the radiant florets longer than broad, white. 
Disk broad, white, li. sometimes very narrow; lower teeth 
not deeper than the others. — Moist meadows and thickets. P. 
VII. VIH. Sncczewort. E. S. I. 
\_A, decoUrans (Schrad.) ; /. opaqm linear-lanceolate hlmtish 
dovmy thickly dotted coarsely and doubly serrate with spreading 
