SYNANTHERE^E. 367 



pubescent or tomentose beneath, petioled ; corymbs in a fastigiate panicle, tomentose : heads 

 pedicellate, hemispherical; involucral scales ovate or ovate-oblong, bluntish, tomentose: 

 interior row oblong-linear, acuminate, scariose. — Desc. Ft. 3. t. 217. Conyza, L. : the 

 denticulate-leaved form, confounded by Linmeus with the following species. C. carolinensis 

 J acq. : the common, entire-leaved form. — 4-6' high ; heads pink, 4"' diani. Hab. Baha- 

 mas !, Swains. ; Jamaica !, all coll. ; Antigua !, Wullsch., Dominica !, Finl. ; [Cuba ! to 

 French islands ! ; Mexico ! to Darien ! and Venezuela !]. 



76. P. purpurascens, DC. Annual, suffrutescent ; branches pubescent ; leaves oblong- 

 lanceolate or lanceolate, unequally serrate, repand, softly puberulous-subtomentose or ela- 

 brescent, petioled ; corymbs subfastigiate, tomentose ; heads pedicellate, subglobose ; involu- 

 cral scales rusty-pubescent, spreading, exterior ovate, bluntish, gradually passing into the 

 interior, ovate-lanceolate, pointed row. — SI. 1. 152. f. 1. — Conyza, Sw. P. glabrata, DC. : 

 the glabrescent form.— 3-4' high; heads purple, 2-3"' diam. — Hab. Bahamas! Swains. ■ 

 Jamaica!, all coll., common in the lowlands; Antigua!, Wullschl. ; [Key West; Cuba! to 

 Guadeloupe ! ; Mexico ! to New Granada !]. 



19. PTEROCAULON, Ell. 



Character of Pluchea, but involucres deciduous and glomerate, or single heads spicate. — 

 Suffruticose, virgate herbs, resembling Gnaphalium ; leaves decurrent ; heads whitish. 



77. P. virgatum, DC. Leaves arachnoid above, white-tomeutose beneath, serrulate 

 with callous teeth, oblong -linear, inferior broader, oblong or elliptical -oblong, superior usually 

 distant, long-decurrent ; heads glomerate (or single) in oblong spikes : the inferior glome- 

 rules distant ; involucre woolly at the base : scales linear-acuminate, recurved at the glabrous 

 point. — SI. t. 152. /. 5. — Conyza, L. C. alopecuroides, Sw. (Pterocaulon, DC.) : a form 

 with few narrow leaves. — Variable in habit, the number of branches, the leaves more or less 

 distant, the narrow ones either prevailing or confined to the upper part of the stem, and in 

 the spikes either compact or slender, with a few or most glomerules distant. 2'-4' high, 

 erect; narrow leaves, usually 4'", broad ones 9"'-15"' broad; involucre 2'" long. — Hab. 

 Jamaica !, all coll., in dry, sandy savannahs ; Antigua !, Wullschl. ; Trinidad !, Lockh., Pd., 

 Cr., in barren savannahs ; [Virgin and French islands !, Sieb. Mart. 194 ; New Granada !]. 



Series 4. Senecionidese. — Style-branches in the perfect or 3 flowers flat-convex, truncate 

 and penicillale at the top, or bearing an hispid tdous appendage {or rarely reduced). 



Subseries 1. Melampodinese. — Flowers unisexual. No pilose pappus. — Leaves usually 



opposite. 



20. CLIBADIUM, L. 



Head discoid, heterogamons, rarely radiate : 2 flowers exterior, 1-pluriserial, interior £ . 

 Involucre subglobose, imbricate : interior scales supporting the 2 flowers, and becoming 

 palete between their inner series. Receptacle convex, naked within the 2 flowers. Corolla 

 2 3-fid : $ 5-fid, with a simple, hispid style, included within the black column, and the 

 ovary excrescent, stipitiform. Achenium biconvex, naked, at length drupaceous. — Suffrutes- 

 cent scabrous, large-leaved herbs or shrubs; leaves opposite, petioled, triplinerved-arch- 

 vein'ed; heads' white, in corymbose panicles. 



* Female flowers \-seriai (Euclibadium, DC). 



78 G asverum DC Branchlets hirsute above; leaves ovate lanceolate or ovate, 

 acuminate, serrulate, 'scabrous -hispidulous, hirsute on the midrib beneath ; heads shortly 

 serial on the co. vmb-branches, subsessde ; involucral scales roundish, stngose ; 2 flowers 

 T.Zi„i * 7 /», manv • S corolla campanulate nearly from the base, papillose at the 

 lo"bT 'acheniul riUouf above the middle ; sterile stalk, densely villous.-^. 317 

 looes, acnenium vm Tmig ^^ ^ c peruvianum, Pcepp. ! 



Patpp. N Gen. t ^~^Z™^ J%'.-5'-6' high ; leaves 3"-6", petiole 4"'-8'" long ; 

 C. trnntatis, DC. I C. ca ™j™^ . g Vmcen t !, Guild. ; Trinidad !, Lockh., Sieb. Tr. 

 heads 2"' diam.— Hab. Jamaica !, Vist. , o- '""=" > 

 71 ; [Mexico ! to Brazil ! and Peru !]. 



