Dions. TANACEItTM. 189 



16. (23.) Dio'iis Besf. Cotton-weed. 



1. D. marit'ima (Cass.). — Densely cottony and white. St. 

 about a foot long, decumbent below, densely leafy, corymbose 

 aljore. L. sessile,- oblong, blunt, flat, crenate, persistent. Heads 

 in terminal corymbose tufts. Inv. cottony. Ft yellow. — Sandy 

 sea-shores, rare. P. VUI. IX. E. 1 



17. (18.) Aetemis'ia. Linn. Wormwood. 

 * Heciptaele hairy. 



1. A. Ahdn'thium (L.) ; hea;ds drooping hemispherical, fl. 

 not all perfect, 1. silky in many deep lanceijlate blunt segments, 

 outer phyll. linear silky, inner roundish scarious. — St. bushy, 

 1 — 2 feet high. Heads in erect leafy panicles. Floral 1. simple. 

 Fl. duU yellow, the outer row female. — Waste ground. P. VH. 

 Vm. Woi-mwood. E. S. I. 



*• JRecepidcle naked. 



2. A. can^es'tris (L.); he^ds drooping ovate glabrous, fl. not 

 all perfect, 7. mky with many linear-lanceolate muoronate seg- 

 ments, stem-1. once or twice pinnate with linear segments, st. 

 wandlike procumbent before ncweriiig, phyll. ovate glabrous with 

 a scarious margin. — ^Barren st. csespitose. Flowering st. slender, 

 1 — 2 feet long ascending when the flowers appear, leafy, smooth. 

 Fl. yeUow, those of "disk sterile ; inv. purplish. — Sandy heaths 

 in Norf. and Sufi"., rare. P.VHI.IX. Y.. 



3. A. valgdris (L.) ; heads ovate, fl. not all perfect, I. woolly 

 and white benieath pinnatifid ztWiSA tomieotoe acuminate cut and 

 serrate segmemts, phyU. woolly. — St. 2 — 3 feet high, erect, leafy. 

 Clusters leafy, nearly simple, erect. Fl. few, reddish or brownish 

 yeUow. — ^Waste ground.;.. P. VII. — IX. Mugzoort. ,B. S. I. 



4. A. maritima (L.) ; heads oblangjjlorets few all perfect) I. 

 downy pinnatifid with linear hlunt segments, phyll. oblong outer 

 wooUy inner scarious. — St. procumhent or ascending, Woolly, 

 much branched. Fl. reddish yellow. Racemes drooping. — 

 /3. A. gallica (Willd.) ; racemes more dense, heads erect. £. B. 

 1001. — y. A. salina (Willd.) ; racemes unilateral, heads dioop^ 

 ing.— Salt marshes. P. VIIL IX. E. S. i. 



[A. ceBrules'cens (L.) ; heads oblong, flts. few all perfect, 1 

 hoary lanceolate tmdivided pinnatifid on the barren shoots. — 

 jB.5.2426.— Not i^ native. P.Vni.IX.] 



18,. (19.) Tanace'thm: Linni Tansy. 

 1. T. vulgdre (L.) ; 1. bipinnatifid, l4s. ' serrate. — Heads in a 



