380 ' SYNANTHEREjE. 



of the disk terete, 3-5-dentate. Style-branches with a short conical app'endage. Ache- 

 mum obconical : crown callous, subentire or denticulate.— Procumbent leafy herbs ; heads 

 peduncled, lateral : ray white. 



135. E. domingensis, Cass. Perennial, arachnoid-pubescent or glabrescent; leaves 

 subsessile, cuneate-obovate, dentate above the middle ; ligules scarcely twice as long as the 

 involucre, 2-3-dentate; disk-flowers 5 -dentate. — Matricaria prostrata, Sw. — Hab. Jamaica!, 

 M'Nab, March ; Antigua !, Wullschl.; Trinidad !, Sch. ; [Haiti to French islands ! ; Vene- 

 zuela, equat. Brazil!].. 



46*. PYEETHRUM, G. 



Head radiate (or discoid) : ray-flowers ? . Involucre imbricate. Zeceplacle convex, 

 naked. Corolla-tube of the disk-flowers winged-compressed. Style-J>ranches truncate. 

 Actienium prismatical : angles equidistant : crown membranaceous. — Ray leJAte or yellow. 

 y^ 136*. p. Parthcniuni, Sm. Perennial, glabrescent; leaves petioled, pinnatisect: 

 pinnee pinnatifid, uppermost serrate ; heads in a terminal corymb : ray white ; involucre 

 hemispherical, at length umbilicate, haK as long as the ray ; crown of the achenium short, 

 lacerate. — Matricaria, L. — Hab. Naturalized in Jamaica 1, M'Nab ; [introduced from 

 Europe] . 



Subseries 6. Gnaphallese. — Head discoid. Anthers tailed. Style-branches truneate- 

 penicillafe, Papptis pilose. — Leaves alternate, often woolly. 



47. GNAPHALIUM, L. 



Head heterogamous : exterior flowers ? , numerous, filiform, central hermaphrodite. In- 

 volucre connivent-imbricate, scarious. Receptacle flat, naked. Achenium subcompressed 

 or cylindrical : pappus soft, 1-serial, deciduous. — Leaves sessile or decurrent. 



• Clusters corymiose. 



137. 6. albescens, Sio. Stem erect, white-tomeutose, suffhitescent at the base; 

 leaves sessile, linear-lanceolate, acuminate, tapering towards the base, subentire, tomentose 

 on both sides, white beneath ; clusters in a terminal corymbose panicle ; involucral scales 

 white, ovate or oblong, bluntish or blunt ; flowers 20-30, hermaphrodite few. — G. poly- 

 cephalum, Mich, (obtusifolium, L.), is apparently a variety with the leaves ronghish and 

 green on the upper side, the involucral scales ju'oving variable. — 2'-3' high ; leaves 1'" broad 

 at the base ; heads 2'" long. — Hab. Jamaica !, Barter., Al., on the summits of the Lignana 

 hills ; [Cuba 1 ; G. polycephalum from the United States 1 to Chili (Less)1. 



138. G. domingense, Lam. Stem erect, white-tomentose, snf&uticose at the base ; 

 leaves broadly sessile, lanceolate, shortly acuminate, unequally ci*enate, rough on the upper 



, green side, white-tomentose beneath ; clusters in a terminal, subfastigiate corymb ; invc- 

 ■ ' lucre campanulate: scales whitish-straw-coloured, ovate or ovate-oblong, bluntish or blunt; 



flowers 50-60, hermaphrodite 7-8. — G. elegans, Kth. G. Poeppigianum, BC, ap. Benth. 



PI. Hartweg. I G. oxyphyllum, p semilanatum, BC, ap. Steele, PI. Seem. ! — Stouter than 



the preceding ; leaves 3"' broad at the base: heads 3"' long, sometimes pale-rusty. — Hab. 



Jamaica I, Macf., M'Nab, WHs., March, in the mountains of S. Andrews, at 4000' alt. ; 



[Haiti ; Mexico to Peru]. 



** Clusters spicaie. 



139. <S. americanum, Mill., Sw. Stem erect, white-tomentose, neai-ly simple; leaves 

 , spathulate-lanceolate, white-tomentose beneath, with oppressed- down, lowest spatiiulate ; 



flusters spicate, inferior, usually shortly peduncled, distant ; involucre few-seriid : inner 

 'f^ scales oblong, pointed or bluntish, brownish above or whitish ; achenium slightly scabrous. 

 —Hook. Fl. Antarct. 2. t. 93. — G. spicatum. Lam. sec. Less. (Limuta, 1S31, p. 226) ; 

 ^ with Lessing, 1 distinguish G.purpureum, L. (DiU. Ht. f. 132), by the linear, blunt inner 

 scales of the involucre, and the more deciduous wool of the leaves. — Hab. Jamaica !, Pd. 

 M'Nab, Wils., March, in the mountains at 4000' alt. and lower down, S. Andrews, S. Tho- 

 mas i. v., Manchester ; [Texas I to Antarctic America ! ; Falklands !, Juan Fernandez !]. 



