v. PLANTS WRIGHTIANiE. 127 



411. P. Wrightii (sp. nov.): glabella; caule bipedali folioso herbaceo e radice 

 perenni 1 collo lanugine densa obtecto ; foliis tenuiter membranaceis oblongi-ovatis 

 crebre spinuloso-denticulatis majoribus duplicato-dentatis basi ssepissime auriculata 

 sessilibus; corymbo composito polycepbalo ; capitulis subfasciculatis S-ll-floris; 

 involucro viscoso-subpuberulo vix triseriali, squamis oblongis obtusiusculis ; acheniis 

 glandulosis ; pappo albo molli e setis tenuibus. — On the Rio Seco and westward ; 

 also on the Rio Grande, Texas ; June. — Stem rather slender, angled, glabrous, or 

 the branches a little puberulent, leafy to the top. Leaves thin, membranaceous or 



P. RiGiDA, Acourtia rigida, DC. ! 1. c. A formosa, Hook. ^ Am. Bot. Beech, p. 437 ; Benth. ! Bot. 

 Voy. Sulph. p. 122, non DC, nee Don. Trixis latifolia. Hook. ^- Am. This is closely related to the 

 last, but has smaller, 9- 15-flowered heads, with the inner scales of the involucre obtuse, at least in De 

 Candolle's specimen. 



P. PLATYPHYLLA, Gray, PI. Fendl. p. Ill, is probably only a variety of P. rigida ; and so, possibly, is 

 Coulter's No. 336, from Zimapan. 



P. HEBECLADA, Acourtia hebcclada, DC. ! I. c, is well figured in Delessert's Icones. The involucre 

 accords well with that of Perezia proper, except that the exterior scales are looser and more herbaceous. 



P. MICROCEPHALA, Acourtia microcephala, DC. I. c., is allied to the last, but with smaller heads and 

 softer pappus. . 



P.? MoscHATA, Llave Sf Lex. I. c, I have not been able to identify. — Ghiesbrecht's Mexican collec- 

 tion has a species, which is said to exhale a strong odor of musk ; but its corymbs are flat, the scales of 

 the involucre not linear nor with reflexed points, and the leaves are adnate-decurrent. I add its characters. 



P. ADNATA (sp. nov.) : herbacea, glanduloso-puberula ; caule elate ramisque ad apicem usque foliosissi- 

 mis ; foliis subglutinosis coriaceo-membranaceis ovato-oblongis crenato-denticulatis (dentibus mucronatis) 

 basi cordato-amplexicaulibus sinubus decurrenti-adnatis ; capitulis fasciculatis subsessilibus in corymbum 

 amplum compositum confertis ; involucro 11-floro cylindraceo, squamis ovatis oblongisque appressis mu- 

 crone apiculatis viscoso-lanatis (mox subglabratis), extimis 2-3 bracteantibus lanceolatis vel subulatis. — 

 Morelia, Mexico, Ghiesbrecht, No. 378, in pine forests, Sept. (v. sp. in herb. Mus. Par.). — The leaves 

 are from three to five inches long ; the narrow heads about half an inch in length. Bristles of the pappus 

 not at all clavellate, nearly uniserial. 



P. PATENS (sp. nov.) : laevigata, glaucescens ; ramis gracilibus divergentibus ; foliis chartaceis oblongis 

 ovatisve basi cordato-amplexicaulibus spinuloso-denticulatis mucronatis laxe reticulatis ; pedunculis subco- 

 rymbosis subulato-bracteolatis monoccphalis ; involucro circiter 20-floro campanulato, squamis chartaceis 

 4-5-seriatis obtusis, interioribus lanceolatis oblongisve, extimis ovatis brevibus ssepius mucronatis. — 

 Northwestern part of Mexico, Seemann. — Var. /3. ramis flexuosis ; foliis acutis vel acuminatis ; pedunculis 

 glanduloso-puberulis abbreviatis. Chiapas, LincZera, No. 439. Mexico, Parkinson (in herb. Hook.). — 

 Var. y. foliis caulinis pi. m. runcinato-lobatis, cset. var. /3. Mexico, Galeotli, No. 2001. " Flowers rose- 

 color, lemon-scented." — I believe this is likewise in Berlandier's collection. 



P. Seemannii (sp. nov.) : tevissima, glaucescens; caule erecto folioso ; foliis coriaceis rigidis lanceo- 

 latis spinuloso-denticulatis deorsum angustatis sessilibus, ramulorum parvulis integerrimis cuspidatis ; capi- 

 tulis 8- 10-fioris in corymbum amplum compositum laxum dispositis ; pedunculis subulato-bracteolatis; 

 involucro turbinate 3 — 4-seriali, squamis lanceolatis sensim acuminatis minute glandulosis, extimis brevibus 

 cuspidatis in bracteolas pedunculi transeuntibus. — Northwestern part of Mexico, Seemann. — Apparently 

 herbaceous and two or three feet high, rigid, very smooth. Cauline leaves three or four inches long and 

 six or eight lines wide, broadest above the middle ; those of the flowering branches gradually reduced to 

 bracts. The summit of the stem or principal branches divides into a large and open compound coi-ymb. 

 Peduncles six to twelve lines long, the upper part crowded with small appressed bracts. Heads narrow, 

 six or seven lines long. Involucre nearly as in the species of De Candolle's genus Perezia. Achenia 

 with a narrowed neck. Pappus of rather soft and fine strongly denticulate bristles, not at all clavellate, 

 in a single series. 



P. NUDicAULis (sp. nov.) : scape e caudice lanalo glabro gracili aphyllo apice paniculate polycepbalo ; 



