426 PROCEEDINGS OP THE AMERICAN ACADEMY 



acheniis angustis glabris margine interiore sursum in alam paleaceam 

 pappiformam producto ; paleolis interinediis sa^pius obsoletis. — Te- 

 quila, in ravines and along hillsides. (359, a thin-leaved form ; 394, 

 with thicker and more pubescent leaves.) The aspect of this plant is 

 essentially that of Z. scandens, Hemsl. (which, at Cordoba, where I as 

 well as Bourgeau collected specimens, is not scandent, but very strag- 

 gling). I suppose that Hemsley's Otopapp^is epaleaceus is a near 

 relative of this, with fewer and much larger heads, and perhaps it may 

 show now and then, as this does, a manifest scarious edge stretching 

 from the pappus-palea on one angle to the tooth on the other. I think 

 that Otopappiis will not hold out as a genus, and agree with Bentham 

 that it is better to retain the Salmea curvijiora, R. Br., in that genus. 

 The extension of a wing of the achenium upward into pappus is not 

 uncommon in the related genera. 



Zexmenia Greggii, Gray, PI. Wright. 1. 113, Shrubby, about 

 10 feet high. Tequila, edges of ravines. (35G.) — Z. uvata, Hemsl., 

 is Z. helianthoides (or the plant of Bates so called), near to this. 



Zexmenia aurea, Benth., ex Hemsl. 1. c. ( Wedelia (?) aurea, Don, 

 and Bot. Mag. t. 3384.) Rio Blanco, in grassy bottoms; October. 

 (757.) — This has been collected by Schaffuer, and we have received 

 it from Schultz Bip. under an unpublished name. 



TiTHONiA TUB^,FORMis, Cass. Rio Blanco ; September. (5G0.) 



ViGuiERA excelsa, Benth., ex Hemsl. (Titlioma, DC. Prodr. o. 

 585.) Guadalajara; September. (443.) — Rio Blanco, a low form; 

 September. (532.) — " Perennial sunflower." 



ViGDiERA TENUIS, Gray, n. sp. Consors V. helianthoidis, annua, 

 pubescens; caule exili subsimplici ; foliis sessilibus subintegerrimis, 

 iuferioribus oppositis lanceolatis, summis alternis linearibus ; capitu- 

 lis paucis longe pedunculatis parvis ; invohicro (lin. 3 loiigo) villoso- 

 cinereo, bracteis subulatis vix intequalibus ; disco convexo ; paleis albo- 

 scariosis mollibus apice mucronato parum rigidulo ; ligulis 5-6 (lin. 

 3 longis) flavis ; acheniis brevibus albo-villosissimis ; pappo deciduo, 

 e paleis 2 lateralibus lanceolatis longe aristatis (achenio 3-plo longi- 

 oribus et paleam receptaculi superantibus) cum 2-4 oblongis obtusis 

 vel trunc;itis fimbriato-ciliatis achenio paullo brevioribus. — Rio Blanco, 

 among shaded rocks ; October. (657.) Doubtless the specimens are 

 depauperate; but I cannot identify the species with any other. 



ViGUTERA HELIANTHOIDES, HBK. A canescent or cinereous but 

 thin-leaved form, probably passing into V. canescens, DC. Rio Blanco, 

 in a deep barranca, abundant ; October, (674.) 



ViGUiER.v QuiNQUERADi.\TA, Gray. Fruticosa, 8-10-pedalis, to- 



