Compositm.] MEXICO. 299 



1. T. Mexicanus. (Tab. LXIII.) 



This genus, we believe, will be found to be quite distinct from any yet described. We have derived the 

 generic name from the large wart or fleshy excrescence at the base of the outside of the achenium. 



Tab. LXIII. Fig. 1. Capitulum ; fig. 2. Floret from the disk ; fig. 3. Floret of the ray, with the 

 accompanying leaflet of the involucre, showing a front view ; the fruit nearly ripe ; fig. 4. Back view of the 

 fruit, with its curious caruncle at the base. 



1. Melampodium sericeum? Lagasca. — De Cand. Prod. 5. p. 518. 



2. M. (Zarabellia, DC.) tenellum; caule herbaceo erecto trichotomo piloso, foliis 

 oblongo- v. Hneari-lanceolatis hinc inde parcedentatis utrinque attenuates supra strigil- 

 losis, pedicellis folio longioribus, involucri squamis 4-5 rotundatis obovatis, achaeniis 

 curvato-obpyramidalibus apice truncatis lineis longitudinalibus transversalibusque rugosis 

 reticulatim notatis, lateribus dorsoque compressis M. oblongifolio proximum. 



3. M. perfoliatum. H. B. et Kunth. — De Cand. Prod. 5. p. 21 Alcina perfoliata. 



Cav. Ic. I. p. 10. t. 15 Wedelia. Willd Polymnia. Poir. 



1. Parthenium Hysterophorus. L. — De Cand. Prod. 5. p. 532. 



1. Zinnia maritima ? H. B. et Kunth, Nov. Gen. Am. 4. p. 251. De Cand. Prod. 5. p. 

 536. — Hab. Talisco. 



1. Jaegeria pedunculata ; hirsuto-hispida, caule subsimplici, foliis lanceolatis inciso- 

 dentatis apice dentibusque callosis, pedunculo elongato gracili monocephalo. 



Hab. Talisco. — Habit of J.mnioides ; but a span long, hairy, almost hispid, with lanceolate leaves, and a 

 very elongated and slender flower-stalk. 



2. J. hirta ? Less. — De Cand. Prod. 5. p. 442. — Hab. Talisco. 

 1. Tithonia pachycephala. De Cand. Prod. 5. p. 585. 



1. Bidens leucanlha. Willd. — De Cand. Prod. 5. p. 598. 



1. Coreopsis bipinnatus. Cav. Ic. 1. p. 9. t. 14. De Cand. Prod. 5. p. 604. 



1. Verbesina pinnatifida. Cav. Ic. I. p. 67. t. 100. De Cand. Prod. 5. p. 615. 



2. V. ceanothifolia? Willd De Cand. Prod. 5. p. 613. 



1. Spilanthes alba. Willd. — L'Herit. Stirp. p. 7. t. 4. De Cand. Prod. 5. p. 625. 



1. Clomenocoma aurantia. Cass. — De Cand. Prod. 5. p. 641. 

 A single capitulum alone, without foliage, is in the collection, from Acapulco. 

 1. Schkuhria virgata. De Cand. Prod. 5. p. 654. 



1. Tagetes (§ Leptocephalae) congesta ; caule erecto pusillo ramosissimo, ramis per- 

 brevibus, foliis confertis oppositis pinnatisectis, segmentis linearibus mucronatis, capitulis 

 corymboso-fasciculatis breviter pedicellatis cylindraceo-oblongis, flosculis 10-12, ligulis 

 solitariis involucro longioribus, pappo aristis 2-4, paleis 2-3 truncatis v. obtusis. 



