296 MEXICO. [Composite, 



Ord. XLVII. VALERIANEjE. Juss. 



I. Valeriana ceratophylla. H. B. et Kunth, Nov. Gen. Am. v. 3. p. 333. t. 276. — Hab. 

 Talisco. 



Ord. XLVIII. COMPOSITE. Juss. 



1. Stevia glandulosa; fruticosa tota pubescenti-glandulosa, foliis oppositis sublonge 

 petiolatis ovatis serratis, corymbis densis polycephalis, involucro trifloro, pappo paleaceo 

 brevi exaristato. 



Hab. Talisco. — A shrubby and apparently rather tall growing plant, every where clothed with glandular 

 viscid down. Leaves, including the petioles, near two inches long. Capitula very compact. Achenia 

 black, linear, crowned with about 5 short paleaceous, nearly equal, jagged scales. 



1. Elephantopus Carolinianus. Willd. — De Cand. Prod. 5. p. 86. 



The E. nudicaulis of the United States is not specifically distinct from this. 



1. Distrephus spicatus. Cass De Cand. Prod. v. 5. p. 87 Elephantopus spicatus. 



B. Juss. 



I. Lagascea latifolia. De Cand. Prod. 5. p. 92. — Nocca latifolia. Lallav. et Lex. Nov. 

 Veg. Descr. \.p. 81. Sweet. Br. Fl. Gard. t. 215. 



1. Pectis Taliscana; caule erectiusculo glabro tetragono opposite ramoso, foliis lineari- 

 bus acuminatis mucronatis grosse glandulosis versus basin utrinque 2-3-ciliatis supra 

 pubescenti-scabridis, pedicellis bracteatis monocephalis capitulos 2-4-plo superantibus, 

 involucri squamis 5 linearibus convolutis acutiusculis, pappo radii et disci setis 3-6 aristatis 

 basi dilatatis paleisque paucis brevissimis. 



Hab. Talisco.— A small and incomplete specimen is all that we have had the opportunity of examining, 

 but the pappus does not correspond with that of any described species. 



2. P. diffusa; glabra, caule ramisque diffusis, foliis linearibus submucronatis, pedicellis 

 elongatis pauci-bracteatis, involucri squamis 5 oblongis acutiusculis, pappi paleis seti- 

 formibus scabris inaequalibus in disco 10-20, in radio paullo paucioribus, ligulis oblongo- 

 linearibus involucrum duplo superantibus. 



Hab. Talisco.— Allied to P. elongata, but smaller, and with a very diffuse habit. 



1. Piqueria trinervia. Cav. Ic. 3. p. 19. t. 235. De Cand. Prod. 5. p. 104. 



1. Gymnocoronis latifolia; foliis ovatis serratis utrinque acuminatis secus petiolum 

 decurrentibus, involucri foliolis oblongis acutis. 



Hab. Talisco.— The flowers very much resemble those of G.'attenuata, DC.\(Alomia spilanthoides, 

 Don j et Hook, et Am. Bot. of S. Am. in Comp. to Bot. Mag. v. 1. p. 238) ; but the capitula are much 

 larger, the scales of the involucre broader, and the leaves are vastly longer, and two inches and more in 

 diameter. 



1. Caelestina ageratoides. H. B. et Kunth, Nov. Gen. Am. 4. p. 151. De Cand. Prod. 5. 

 p. 108.— Ageratum caelestinum. Bot. Mag. t. 1730. 



