FLORA OF THE ISTHMUS OP PAXAiTA. 153 
tricliotomi, fastigiati, terminalesj ramis ramulisquc basi bractcatisj gracilibus, tcrctibiis, dense ct 
patenter villosis. Capitula monoica, brcviter pedicellata, rarius subsessilia, pcdiccUo basi bracteola 
minima lincaii pubescente suffulto, ramidos ultimos corymbi terminantiaj subglobosa, pan-a, li 
lineam alta et lata. Involucri biscriaUs squamae licrbaccoc apicc couuhcntes, sub antbesi floribns 
masculis breviores, nervosre^ apice margincquc longc ciliatae, csetcrum glabne, plerumquc G-8, 
insequales, imbricatim semi-aniplccteiites, extcriorcs 3 et interiorca 2 late ovatse acutiusculae, cocli- 
leariformes, quibus seepe 1-3 mnlto angustiorcs planiusculai intimse acccdunt. Reci'ptacnhim 
perangnstum, nudum. Flores oranes tubulosi; faminei 4 vel 5 in ambitu, involucri squamis abscon- 
diti, comprcssiusculi, subarcuati, apice 3-dentati, albidi, tubo lineam longo ovario ovato compresso 
glabro nigro calvo insidente; styll rami cxserti, divcrgcnti-rccurvi, adplanati, cxtus parcc papil- 
losi, intus versus bifurcationem glabri, in apicem obtusiusculura attenuati. Flores masculi 
7-13 centrales, cylindrici, tubo brcWssimo basi parum attenuato, fauce scnsim ampliata ?equali, 
apice brevissime 5-dentati, dcntibus ovatis, inflexis, villis papillosis longiusculis dcnsissimo obsitia, 
CEcterum glabcrrimi, nervis 5 in sinus dentium cxcurrcntibus perducti, olivacei, cum ovario linean, 
tcrcti, basi glabro^ supra medium pilis longissimis articulatis crispis dcnsissime villoso, semiliucam 
longo, lineas 2 metientes. Filamenta crassiuscula, plana, ima basi corollas inscrta, infra inscrtioncm 
antberarum ante antbcsin spiraliter torta, flavescentes ; anther(B anthcseos tempore saepe exscrtai, basi 
ecaudate, apicc in ajipcndiculam libcram, ovatam, basi pauUo constrictam, apice acutam, inflcxam 
auctse, nigne; pollinis granula globosa, undique ccliinulata, alba; stylus indivisus, cxscrtus, cylm- 
dricus, obtusus, dense papillosus. Achania florura foemineorum fertilia, crassa, obovata, subcom- 
pressa, basi in stipitem brevissimum saspc bine album attenuata, apice tubcrculo minimo intcgro 
obtuso, vel interdum bifido, aucta, csetcrum calva, atcrrlma, nitentia, glaberrima, lineam longa, et 
medio fere <equilata. Achania fiorum masculorum sterilia, stipitiformia, basi medio tonus glabra, 
vel pilis raris conspersa, supra medium et apice obtuso pilis albis planiusculis longissimis articulatis 
crispis densissime villosa, lineam paullo superantia. 
This species is well dlbtinguislied from all others wbicb are known and described, by the smooth and 
shining, dark black-coloured acha^uia of the ray, and by the glabrous involucre being only ciliate on the 
margin of the scales and at their summit. It seems however to be related to BaiUicria Barhasco, IT. B. K., 
Nov. Gen. et Sp. torn. 4. p. 288, and Kunth's accurate description of it agrees with it almost entirely, but 
the receptaculum is certainly not chaffy in our plant. I have not seen a specimen of Humboldt's collection, 
which is, I believe, wanting in AVilldenow's and Kunth's Herbaria, and thus it wiU remain a doubtful species. 
Unxta, Linn, fil., supplem.— Be Cand. Prodr. torn. 5. p. 507.— Miqticl, Stii-p. Surinam. Select, 
p. 191. tab. 56 (non H. B. K.).— Char. Gen. emend. Capiiulum monoicum pluriflorum, floribus 
marginalibus foemincis 2-5 vel pluribus tubulosis vel ligulatis, floribus centralibus 3-7 vel pluribus 
masculis tubulosis, omnibus guttis resinosis conspersis. Invohrrtm biscriale, exterius diphyllnm, 
e squamis 2 lanceolatis oppositis bractejeformibus constans, intcrius e squamis 4-5 ol)ovatis com- 
positum, quarum 2 opposit'^ longitudinalitcr plicatse, reliquee plan*. Receptaculum demum con- 
vcxum, 'epaleaceum* gyroso-alveolatum. Corolla florum foemineorum sive tnbulossc, inaequaliter 
* CI Miquel, 1. c, receptaculum paleaeeum, et quidem flores foemineos paleis longioribus, maaculos 
Tjaleis depauperatis persistentibus discriminatos descripsit, et in icone tab. ^JG. fig. h et c, dehneavit. 
Equidem iterato examine, receptaculum utriusque speciei semper omnino nudum observavi, tum m capitubs 
fiorigeris' tum in fructifcris. Cieterum specimen meum Unxi^ camphorat^, Lmn. fil.. m descnptionem et 
iconem a CI. lllquel, 1. c, exaratam bene quadrat, exceptis antheris, quarum veram imagmem figura e 
non reddit. 
