142 
:iiAL 
at the base. The inflorescence in general, and the texture, situation, nervation, and pubescence of the 
leaves, are similar in these three species. 
547. Pectts elongaia, H. B. K.^ Nov. Gen. et Sp. torn. 4. p. 263. no. 2. tab. 392. — De Cand. Prodr. 
torn. 5. p. 99. no. 5. — Pedis stricta, Willd. Herb. no. 16,139 ! In savanas all over the country. 
548. Pectis diffusa, Hook, ct Am., Bot. of Beedi. Voy. p. 296. — Wlprs. Rep. Bot. Syst. torn. 
2. p. 515. no. 2. — Pectis arenaria, Bentli., Bot. of Voy. Sulpli. p. 110. — "V\lprs. Rep. Bot. Syst. 
torn. 6. p. 104. no. 1. Common on the sea-side of the Pacific Ocean, especially about Cacagual in 
Darien. 
549. Pectis filipeSj Harvey et Gray, in PI. Coult. Ined. — Gray, Plant. Fendl. p. 62 adnot. — 
"Wlprs. Ann. Bot. Syst. torn. 2. p. 812. no. 2. Savanas about Panama, 
I am not quite certain "whether Dr. Seemann's plant is the same as Coulter's from California, of which 
I have not seen an original specimen : in general it agrees well with Gray's short diagnosis. It has hke- 
wise the size and aspect of P. UnifoJia, Linn., but the leaves are 1-1| line wide, and not narrowly linear. 
Moreover, I find no great difference between the pappus of the ray and that of the disc, which is coroni- 
form in both, and consists of some very short, unequal, acute palefe, of which sometimes one or two arise 
in a longer antrorsely-barbed awn. In our single specimen however I have not found a mature achaenium. 
Besides this circumstance, "the number of awns or palese, and the difference between the pappus of 
the ray and disc, in all Pcctidccc, is variable," as remarks Asa Gray in 'Plantai "Wright lause,' tom. 1. 
p. 82 (1852). 
Tribus II. Eupatoriace^. 
TuBEROSTYLis, Stectz, nov. gen. CapituJum pluriflorura, homogamum, floribus omnibus her- 
maphroditis. Involucrum campanulatum, imbrieatum, squamis pluriserialibus inscqualibus adpressis, 
interioribus oblongo-lanceolatis coehleariformibus obtnsis, mediis sensim decrescentibus, exterioribus 
multo brevioribus ovatis planis. Peceptaculum eonvcxum nudum. CoroUts tubulosa), cylindrical, 
graciles, sequales, apice brcvitcr S-dentatse, involucrum superantes. Filamenta 5, semiliueam supra 
basin eoroUse inserta, longiuscule libera, paullo infra insertionem antherarum sursura et iterum 
deorsiim plicata. Antherce oblongse, obtusse, versus basin attenuatie, ecaudatse, apice exappcndiculatse. 
Stylus basi tubcri crasso spougioso apice emarginato insidenSj filiformis, stigmatis ramis 2 elongatis 
recurvatis, coroUam longe excedentibus, eomplanatis obtusis terminatus. Achtsnia obpyramidata, 
obtusangula, paullispcr arcuata, sulcata et transverse rugosa, margine caUoso angusto obliquo in- 
sequalitcr et obtuse dentato superata, cseterum calva. — Herha, j/rostrata, radicans, glabra ; foliis op- 
positis, obovatis, in petiolum attenuatis, apice paucicrenatis, obsolete uninerviis, snbaveniis, crassiusciiUs ; 
pedunculis ierminalibus et axillaribus, apice irichotomis ; pedicellis \~Z-cephalis ; capitulis sessilibus 
sive medio brevissime pedicellato, bractea minima suffultiSy circiter \0-floris. 
550. TuBERosTYLis 7?A;:ro/jAortp, Steetz (Tab. XXIX.). Grows epiphytically on the roots of 
Mangrove-trees, Southern Darien. 
A plant closely allied to Alomla agemtoidcs, H. B. K., of which I have seen an original specimen in 
Kunth's Herbarium, but with a very different habit, which is not unlike that of some Valerianem ; other- 
wise it differs from Alomia by the obovate much imbricated involucre with fewer flowers, which are not 
ampliated at the sUmmit, by the inappendiculated anthers, and chiefly by the thick and spongiose tuberous 
callus at the base of the style. 
