Tanacetum.] composite. 265 



■t-|-t Receptacle naked or hairy. Synanlhera discoid. 



XVII. Tanacetum, Linn. Tansy. 



" Achenes angled, crowned with a large epigynous disk and a 

 membranous margin. Receptacle naked. Involucre hemispheri- 

 cal, imbricated. Lhjulate florets short and trifid, or wanting. 

 (Heads homochromous)." — Br. Fl. 



1. T, vulgare, L. Common Tansy. " Leaves bipinnatifid 

 inciso-serrate." — Br. Fl. p. 229. E. B. t. 1229. 



In dry hilly pastures, on hedgebanlis, by roadsides and borders of fields ; not 

 very common, i^/. July ?— September. Fr. September, October. 2^. 



£,'. Med. — At St. John's Ryrle, sparingly. Near Lake farm, by Sandowii. 

 Hedge between Lake and Blaekpan. By BembridKe, in the walk under the 

 shore. Plentiful in the lane from Whitecross to Hilliard's. In a pasture-field 

 close to Newchurch, at the S. end of the village, in great plenty. In some mea- 

 dows at Newchurch,'a little S.E. of the church, in great abundance. lu a field 

 about a quarter of a mile S.W. of Godshill church. Field opposite Holmwood, 

 near Ryde, Miss Ferguson. 



W. Med. — Plentiful by ihe roadside from Chalo to Blackgang, and abundantly 

 on a high bank by the roadside between Mottiston and Brixton. At Moor Town, 

 Brixton. At Kiujjston near the church, and by Beckfield barn, commonly. Bank 

 above the road between Calbourne and Newbridge, near the latter. 



Root long, tough, stringy, creeping horizonially, with many lateral fibres. 

 Stem erect, 1 — 3 feet high, solid, leafy, round, furrowed, brownish purple, branch- 

 ing at the top, usually bare below from the decaying of the lowermost leaves. 

 Leaves alternate, bright green, sessile, bipinnatifid, the segments acutely inciso- 

 serrate, glabrous, sprinkled thioUy with resinous dots, in which the strong odour 

 of the plant resides. Corymbs terminal, cymose, of many erect leafy branches, 

 and bearing golden yellow flowers as broad as a silver penny. Involucre hemi- 

 spherical, its scales unequal, ovate-obtuse, close-pressed, with a brownish keel and 

 torn membranous edges. Receptacle hemispherical, quite smooth and naked. 

 Florets very numerous, those of the circumference often 3 cleft and unisexual ; 

 sometimes all the florets 5-cleft and androgynous like those of the disk. Segments 

 of the corolla thickened at the lips. Style cleft, with grooved reflexed segments. 

 Achenium greenish, oblong, truncate, with 4 or 5 prominent rib-like angles, the 

 faces plane or with an intermediate costa, often sprinkled with a few resinous 

 grains, glabrous. Pappus none, but a short, membranous, uneven border at the 

 truncate summit of the seed. Receptacle (in seed) broadly conical, solid, covered 

 with raised points of attachment for the seeds, not alveolate. 



DioTis, Desfont. Cotton-weed. 



? 1. D. maritima, Cass. Sea-side Cotton-weed. Br. Fl. p. 228. 

 SantoHna, L. : E. B. t. 141. 



On sandy sea-shores ; now at least extinct. Fl. August, September. 2f . 



W. Med. — Shore at Sconce Tower, Mr. W. D. Snooke. 



I insert this curious plant solely on the authority of the compiler of the ' Botany 

 of the Isle of Wight,' having never met with it here or elsewhere in the island 

 myself, or heard of any one besides who had. Though inclined to suspect an 

 error in this instance, I have so repeatedly confirmed the accuracy of Mr. Snooke's 

 stations, that T retain the species under a line, with a few other doubtful and 

 extinct plants, merelv observing that the assigned habitat, as it now exists, is not 



2 M 



