380 SYNANTHEREjE. 



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

 nium obconical s crown callou3, 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*. PYRETHRUM, G. 



Head radiate (or discoid) •. ray-flowers ? . Involucre imbricate. Receptacle convex, 

 naked. Corolla-tube of the disk-flowers winged-compressed. Style-branches truncate. 

 Achenium prismatical : angles equidistant : crown membranaceous. — Ray white or yelloio. 



136*. P. Parthenmm, Sm. Perennial, glabrescent; leaves petioled, pinnatisect: 

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

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

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

 Europe]. 



Subseries 6. Gnaphaliese. — Head discoid. Anthers tailed. Style-branches truncate- 

 penicillate. Pappus 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 corymbose. 



137. G. albescens, Sw. Stem erect, white-tomentose, suifrutescent at the base; 

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

 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 aud 

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

 at the base ; heads 2"' long. — Hab. Jamaica !, Bancr., Al., ou the summits of the Liguana 

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



138. Gr. domingense, I^tm. Stem erect, white-tomentose, suffruticose at the base ; 

 leaves broadly sessile, lanceolate, shortly acuminate, unequally crenate, rough on the upper 

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

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

 flowers 50-60, hermaphrodite 7-8. — G. elegans, Kth. G. Pceppigianum, DC, ap. Benth. 

 PI. Hartweg. ! G. oxyphyllum, P semilanatum, DC, ap. Steetz, PI. Seem. ! — Stouter than 

 the preceding; leaves 2'" broad at the base: heads 3"' long, sometimes pale-rusty. — Hab. 

 Jamaica !, Mac/., M'Nab, Wils., March, in the mountains of S. Andrews, at 4000' alt. ; 

 [Haiti ; Mexico to Peru]. 



** Clusters spicate. 



139. G. americanum, Mill., Sw. Stem erect, white-tomentose, nearly simple ; leaves 

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

 clusters spicate, inferior usually shortly peduncled, distant ; involucre few-serial : inner 

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

 — Hoot. Ft. Antarct. 2. t. 93. — G. spicatum, Lam. sec. Less. (Linnaa, 1831, p. 226) : 

 with Lessing, I distinguish G. purpureum, L. (Dill. 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 ! to Antarctic America ! ; Falklands !, Juan Fernandez !]. 



