V. 



PLANT^ TTRIGHTIAN^. 



127 



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411. P. Weightii (sp. nov.): glabella; caule bipedali folioso licrbaceo e radice 

 perenni "? coUo lanugine densa obtecto ; foliis tenuiter membranaccis oblongi-ovatis 

 crebre spiiiuloso-denticulatis majoribus duplicato-dentatis basi sacpissime auriculata 

 sessilibus; corymbo composito polycephalo ; capitulis subfasciculatis 8-11-floris; 

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

 glandulosis ; pappo albo molli e setis tenuibus. — On tlie Kio Seco and wcstward ; 

 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 



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P. RiGiDA, Acourtia rigida, DC, ! h c. A formosa, Hook. ^ Arn. Bot. Beech, p, 437 ; Benth. ! Boi, 

 Voy. Sulph. p. 122, non DC^ nec Don. Trixis latifolia, Hook. ^^ Arn. This is closely relatcd to the 

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

 Candolle's specimen. 



P. PLATYPHYLLA, Gray^ PL Fendl. p. 111, is probably only a variely of P. rigida ; and so, possibly, is 

 Coulter's No. 336, from Zimapan. 



P. HEBECLADA, Acourtia hebeclada, DC. ! l, c, is well figured in Delessert's Tcones. The involucre 

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



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

 softer pappus. 



P. ? MOSCHATA, Llave 8f Lex. l. c, I have not been able to identify. — Ghiesbrecbt'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 lincar nor with reflexed points, and the leaves are adnate-decurrent. I add its characters. 

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

 mis ; foliis subglutinosis coriaceo-membranaceis ovato-oblongis crenato-denticulatis (dentlbus 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-Ianatis (mox subglabratis), extimis 2-3 bracteantibus lanceolatis vel subulatls. 

 Morelia, Mexico, Ghieslrecht^ No. 378, in pine forcsts, Sept. (v. sp. in herb. Mus. Par.), — Thc 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.) : lasvigata, glaucescens ; ramis gracilibus dlvergentibus ; foliis chartaceis oblongis 

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

 rymbosls subulato-bracteolatis monocephalis ; involucro circiter 20-floro campanulato, squamis chartaccis 

 4-5-seriatis oblusis, interioribus lanccolatis oblongisve, extimis ovatis brevibus scepius mucronatis. 

 Northwestern part of Mexico, Seeviann. — Var. ^. ramis flexuosis ; foliis acutis vel acuminatis ; pedunculis 

 glanduloso-puberulis abbreviatis. Chiapas, Linden^ No. 439. Mexico, Parkinson (in hcrb. Hook.). 

 Var. y, foliis caulinis pl. m. runcinato-lobatis, ca^t. var. /3. Mexico, Galeolti^ No. 200L '^FIowers rose- 

 color, lemon-scented." — I believe this is likcwise in Bcrlandier^s coUection. 



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

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

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

 involucro turbinato 3-4-seriali, squamis lanceolatis scnsim acuminatls 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 middlc ; those of the flowering branches gradually reduced to 

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

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

 six or seven lines lon"-. Involucre nearly as in the species of De Candolle'*^ genus Pcrezia. Achenia 

 wilh a narrowed neck. Pappus of rather soft and fine strongly dcnticulate bristlcs, not at all clavellate, 



in a single series. 



P. NunicAULis (sp, nov.) : scapo e caudice lanato glabro gracili aphyllo apice puniculato polycephalo ; 



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