298 MEXICO. [Composite. 



brevibus reliquis (14-15) subsequalibus lineari-lanceolatis membranaceis striatis sub 15- 

 floris, acheniis striatis puberulis. 



Hab. Talisco.— Leaves 3-4 inches long ; petiole 1 inch. Capitula f of an inch in diameter. Pappus 

 white, as the corollas also appear to be. 



1. Heterotheca inuloides. Cass DC. Prod. 5. p. 317 — Diplocoma villosa. Sweet, Fl. 



Gard. t. 246.— Doronicum Mexicanum. Cerv. in Link et Otto, Hort. Berol. t. 22. 

 The H. leptoglossa, DC, is probably not distinct from this. 



1. Baccharis longifolia ? De Cand. Prod. 5. p. 402. 



In our plant, the exterior scales of the involucre are ovate, the interior oblong, slightly but distinctly 

 ciliated, and the lower part of the branches appears woody. 



2. B. hirtella ? De Cand. Prod. 5. p. 418. 



If this be the plant of De Candolle, the leaves are 5-6 inches long, an inch or an inch and a half broad, 

 the capitula densely clustered, of a pale straw-colour, almost white. 



1. Eclipta erecta. L De Cand. Prod. 5. p. 490. 



2. E. brachypoda. Mich.—De Cand. Prod. 5. p. 491. 



CHiETYMENIA. Nov. Gen. 

 Capitulum multiflorum, heterogamum, fl. radii ligulatis fcemineis obovatis, disci plurimis tubulosis herma- 

 phroditis. Involucri patenti-campanulati squamce paucae subbiseriales, inaequales, laxe imbricatse, ovatse, 

 subacuminatse, vix foliacea;. Receptaculum nudum. Styli rami attenuati pilosi. Achenia oblonga, basi 

 attenuata, angulata, angulis pilosis. Pappi seta rigidse, sub-20, corolto tubulosee longitudine, piloso-hispida;, 

 basi utrinque ala membranacea incisa auctse.— Herba ? subsimplex, Mexicana, glabra. Caulis teres. Folia 

 elongata, lineari-lanceolala, subpunctata, trinervia, opposita, basique connata. Pedunculi terminates 

 axillaresque, longissimi, nudi. , Flos majusculus (diametro bipollicaris), aureo-flavus. 



1. Chaetymenia peduncularis. (Tab. LXII.) 



Hab. Talisco.— This genus appears to belong to the Subtrib. Tagetinew of the Senecionide*: {DC.) : 

 but the character of the genus comes near to Burrielia in the Helenieje. It, however, seems quite distinct 

 from anything hitherto published. 



Tab. LXII. Fig. 1. Floret of the ray ; Jig. 2. Do. of the disk ; fig. 3. Seta of the pappus -.—magnified. 



1. Porophyllum Linaria ? De Cand. Prod. 5. p. 649.— Cacalia Linaria. Cav. Ic. 3. p. 



19. t. 257 Hab. Talisco. 



TULOCA.RPUS. Nov. Gen. 



Capitulum pauciflorum, monoicum ; radii flosculo solitario fosmineo ligulato, apice tridentato, tubo gracili 

 basi dilatato ; disci flosculis 3-4, tubulosis masculinis, tubo longo gracili, limbo campanulato, alte 5-fido. 

 Involucrum cylindraceum, 6-phyllum, biseriale, foliolis 3 ext. majoribus sequalibus striatis acutis, 3 int. 

 scariosis, unico florifero. Receptaculum paleaceum, paleis involucri seriei int. similibus. Anthers exsertse 

 (viridescentes) ; filamentis dense barbatis. Stylus (fl. masc.) paululum exsertus, indivisus, puberulus. 

 Achenium solitarium in singulo capitulo, magnum, obovalo-oblongum, compressum, basi dorso callo magno 

 rugoso tetragono.— Herba? Mexicana, glabra. Caulis teres. Folia opposita, petiolata,ovato-lanceolata, 

 serrata. Corymbi laterales terminalesque compositi. Flores fiavi. 



