I 



298 MEXICO. iCompositm. 



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

 Horis, acheniis striatis puberulis. 



Hab. Talisco. — Leaves 3-4 inches long ; petiole 1 inch. Capitula § 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 

 filiated, 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, hetcrogamum, fl. radii ligulatis foemineis obovatis, disci plurimis tubulosis herma- 

 phroditis. Involucri patenti-eampanulati squamae paucae subbiseriales, inaequales, laxe imbricatae, ovatae, 

 subacuminatae, vix foliacese. Receptaculum nudum. Styli rami attenuati pilosi. Achenia oblonga, basi 

 attenuata, angulata, angulis pilosis. Pappi setce rigidaa, sub-20, corollas tubulosas longitudine, piloso-hispidae, 

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

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

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



1. Chaetymenia pedimcidaris. (Tab. LXII.) 



Hab. Talisco. — This genus appears to belong to the Subtrib. Tagetineai of the Senecionidete (DC.) : 

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

 from anything hitherto published. 



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



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

 19. t. 257 Hab. Talisco. 



TULO CARPUS. Nov. Gen. 

 Capitulum pauciflorum, monoicum ; radii flosculo solitario fcemineo 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 Horifero. Receptaculum paleaceum, paleis involucri seriei int. similibus. Anthera exsertae 

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

 Achenium solitarium in singulo eapitulo, magnum, obovato-oblongum, compressum, basi dorso callo magno 

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

 •ierrata. Corymbi later ales terminalesque compositi. Flores flavi. 



