OF ARTS AND SCIENCES. 37 



l<za, — a genus which I extended in PI. Fendlerianaa, and again in PI. 

 Wrightiante, and to which must now be added Adenophyllum Wrightii 

 of the latter work, and even Thymophylla, Lag., — is distinguished 

 from Dysodia by its pappus of at most 1-5-aristate palete, or else 

 some or even all of them muticous ; and the simple campanulate in- 

 volucre is wholly gamophyllous. In this genus we find all gradations 

 between a simple and a double pappus. The branches of the style 

 are truncate, and either with or without an apiculation or an obscure 

 cone. 



The species of these genera may be arranged and characterized as 

 in the foot-note. * 



* DYSODIA (Dyssodia), Cav. 



§ 1. Gtmxol^eva, DC. Involucrum campanulatuni, ssepius modo Tagetis alte 

 gamopliyllitm basi fere nudum : styli rami ex apice truncato-subpenicillato subito 

 tenuiter appendiculati : receptaculum alveolato-dentatum, pubescens : capitula 

 solitaria pedunculata, majuscula: folia prajtcr lobulos stipuliformes indivisa, 

 opposita. 



D. SESSILIFOLIA, DC. Pfodr. V. Gil. Ilijmcnatherum sesmllfolhun, Hemsl. Bot. 

 Biol. Centr.-Am. ii. 241, referred to that genus on account of a note in Bentli. 

 & Hook. Gen. PI., but it is like Ihjmenatlierum only in the gamophyllous invo- 

 lucre. Style-appendages slender, nearly setiform. 



D. iNTEGRiKOLiA. Gracilis, glabra ; foliis angusto-lanceolatis adpresso-serru- 

 latis basi attenuatis subpetiolatis basi utrinque lobulo subulato-setaceo instructis 

 (iiiferioribus ignotis) ; involucro (semipoUicari) bracteolis paucis parvis lineari- 

 subulatis calyculato, bracteis propriis angusto-lanceolatis infra medium tantum 

 coalitis; ligulis aureis ; styli fl. herm. ramis apiculo tenui brevi terminatis. — 

 District of Chiapas, Mexico, along streams in the mountains, no. 784, Glues- 

 breght. Leaves not half the size of tliose of D. serrali/olia, which is no. 519 of 

 Ghiesbreglit, and which is said to have " fleurs rouge tres vif." In this species 

 they are obviously yellovr. 



§ 2. EuDYSODiA. Involucrum campanulatuni vel hemisphajricum basi caly- 

 culato-fulcratum, bracteis inferne tantum coalitis vel liberis : styli rami aut 

 prfficedentis (D. porophylla & cancellata), aut plerumque sensim in appendicem 

 gracilem tenui-subulatam producti : corollse dentes saepius angusti : receptacu- 

 lum pi. m. fimbrilliferum : capitula majuscula, pedunculata, ramos apice nudos 

 tcrminantia : herbas perennes nunc suffruticosffi, oppositifolias et alternifoliffi. 

 — Dgsodia § Eudysodia, Bcebera pro parte, Baberoides, et gen. Clomenocoma 

 (Cass.), DC. 



* Receptaculum eximie setoso-fimbrilliferum : achenia pubescentia : capitula 

 speciosa : folia omnia opposita. — Clomenocoma, Cass. Coinaclinium, Scheidw. 

 & Planchon. Clappia pro parte, Benth. 



■*- Bracte« accessoriae involucri ovatffi. 

 D. GRANDiFLORA, DC. Prodr. v. C40. "Folia ovali-lanceolata, argute serrata, 

 acuminata; involucro bracteis ovatis subdentatis acuminatis cincto"; pappo 



