T. PLANTiE WRIGHTIANiE. 115 



to D. clirysantliemoides No. 432 of Coulter's Mexican collection, Gregg's No. 540, 

 from Saltillo, and a plant of Galeotti's collection, without a number, which, having 

 coarser segments to the leaves, more dilated at their apex, are probably D. pubes- 

 cens, Lagasca, DC. 



359. Hymenatherum (Aciphyll^a) acerosum: fruticulosum, glabrum ; ramis 

 ad apicem usque foliosis capitulo solitario subsessili terminatis ; foliis oppositis (raro 

 alteruis) et in axillis fasciculatis acerosis integerrimis ; involucro cylindraceo ; pap- 

 po e paleis 18-20 angustis in aristas setasve scabras insequales 3 - 5-partitis. — 

 Dysodia'? (Aciphyllaea) acerosa, DC! Proclr. h. p. 641. Aciphyllsea acerosa, Gray, 

 PL Fencll. p. 91, adnot. Calcareous hills of the San Felipe: also. on the Rio 

 Grande, Texas ; July - Sept. — Two or three species of Hymenatherum now known 

 to me having as many as eighteen or twenty palese to the pappus, and one having 

 some of the palese cleft into from three to five setse or setose teeth, I cannot avoid 

 referring the present plant to this genus, with which it accords in habit much bet- 

 ter than with Dysodia. A revision of the genus, as I should now receive it, is ap- 

 pended.* 



octophyllo (squamis obovato-oblongis valde carinatis) bracteis 6-8 lineari-subulatis integerrimis cincto ; 

 ligulis obovatis (aurantiacis ?) exsertis ; pappi setis in phalanges 8- 10 alternas dimidio breviores basi tan- 

 tum paleaceo-concretis. — Btsbera fastigiata, H. B. K. ! Nov. Gen. 4" Sp. 4. p. 198. B. tagetiflora, 

 Spreng. 



* HYMENATHEKUM, Cass. 



Capitulum multiflorum heterogamum ; ligulis foemineis. Involucrum turbinatum vel campanulatum, e 

 squamis 10- 15 fere ad apicem cupulato-concretis gamophyllum, basi bracteatum seu ebracteatum. Re- 

 ceptaculum planum, nudum vel subalveolatum. Styli rami fl. disci cono brevissimo obtuso capitellati. 

 Achenia gracilia, striata, nunc subangulata. Pappus e paleis 10-20 nunc omnibus nunc alternis trifidis 

 (raro 5-fidis), lobis setifomiibus inaqualibus vel lateralibus dentiformibus. Herbas humiles vel suffru- 

 ticuli ; ramis monocephalis ; foliis angustis involucrisque grosse glandulosis ; floribus flavis siccate nunc 

 viridescentibus. 



Hymenatherum, Cass. Bull. Philom. 1817, 1818, Sf Did. Sci. Nat. 22. p. 313. 



Hymenatherum (excl. § 2), Aciphylleea § ? Pysodias, & Gnaphalopsis, DC. Prodr. 



Hymenatherum & AciphyllEea, Gray, PI. Fendl. p. 68, 91, adnot. 

 § 1. AciPHYLL^A. Pappus e paleis 18-20 (conformibus vel alternis minoribus) profunde trifidis, lobis 

 setiformibus, lateralibus sajpius 2- 3-fidis. Achenia teretia multistriata. — Fruticulus ericoideus gla- 

 ber; foliis acerosis integerrimis plerisque oppositis; capitulis ramulos foliosos terminantibus sessilibus. 



1. H. acerostjm: vide supra. Dysodia.? (Aciphyllsea) acerosa, DC. Prodr. h. p. 641. 



§ 2. DvsoDlOPSis. Pappus 10-paleaceus ; paleis conformibus rigidis, aut submuticis aut triaristatis. 

 Achenia 4 - 5-angulata. — Herbce perennes .? glabra, DysodicB facie ; foliis superioribus vel omnibus 

 alternis linearibus integerrimis seu laciniatis baud pinnatipartitis ; capitulis pedunculatis pi. m. bracteatis. 



2. H. TAGETOiDES, Gray, PI. Fendl. I. c. Vide p. 116. 



3. H. Wrightii, Gray, PI. Fendl. I. c. Vide p. 116. 



§ 3. Hymenatherum verum. Pappus 10 - 20-paleaceus ; paleis 1 - 3-aristatis vel alternis muticis. 

 Achenia subteretia. — Herba3 annuse seu perennes, nunc sufTruticuli, humiles, glabra; vel pubescentes ; 

 foliis pinnatipartitis inferioribus tantum oppositis, lobis filiformibus subulatisve integerrimis ; capitulis 

 pedunculatis basi baud vel parce bracteatis. 

 * Species annua; ; foliis muticis hand rigidis ; pe.dunculis Ireviusculis bracteolis suhulatis inslruclis. 



4. H. BCEBEROIDES (sp. nov.) : glabrum, diffusum; foliis pinnati- (7-) partitis, lobis filiformi-linearibus 

 breviusculis ; pedunculis subcorymbosis breviusculis multibracteatis ; involucro hemisphferico ebracteato ; 



