COMPOSITE. 131 



2. H. seabra, Dunal. Roughish, especially the leaves. 

 Pappus of 2 or 3 teeth, or a mere chaff-like border. Niagara 

 Falls and N.W. 



43. ACHILLE'A, L. YARROW. 



1. A. millefo'lium, L. (MILFOIL.) Stems simple. Leaves 

 dissected into fine divisions. Corymb flat- topped. Kays 

 only 4 or 5, short. Fields and along fences ; very common. 



2. A. Ptar'miea, L. (SNEEZE- WORT.) Leaves simple, 

 lance-linear, serrate. Corymb loose. Bays 8-12, much 

 longer 'than the involucre. Atl. Prov. 



44. POIiYM'NIA, L. LEAF-CUP. 



P. Canadensis, L. A coarse clammy-hairy herb. Lower 

 leaves opposite, petioled, pinnatifid ; the upper alternate, 

 angled or lobed. Heads small ; rays pale yellow. Shaded 

 ravines; south-westward. 



45. SIL'PHIUM, L. ROSIN-PLANT. 



1. S. per folia' turn, L., (Cup- PLANT) is found in south- 

 western Ontario. Stem stout, square. 4-8 feet high. Leaves 

 ovate, coarsely toothed, the upper ones united by their 

 bases. 



2. S. terebinthina'eeum, L. (PRAIRIE DOCK.) Stem 

 tall, round, naked above, smooth. Radical leaves some- 

 times 2 feet long, rough-hairy, coarsely serrate, on slender 

 petioles. Heads small, loosely panicled. Open woods and 

 grassy banks, south-western Ontario. 



46. KRIG'IA, Schreber. DWARF DANDELION. 

 K. amplexieaulis, Nutt. (Cynthia Virginica, Don.) 

 Roots fibrous. Stem-leaves 1-2, oblong or lanceolate-spa- 

 thulate, clasping, mostly entire, the radical ones on short 

 winged petioles. Peduncles 2-5. South-western Ontario. 



47. LAMP'SANA, Tourn. NIPPLE-WORT. 



L. COmmu'nis, L. Very slender and branching. Leaves 

 angled or toothed. Heads small, loosely panicled. Borders 

 of springs ; common at Queenston Heights. 



