82 UNITED STATES AND MEXICAN BOUNDARY. 



Laphamia angustifolia? var. laciniata: caulibus elongatis diffusis; foliis o"blongis subcuneatis 

 laciniato-lobatis. — Crevices of rocks along tlie Eio Grande^ Texas ; October ; Bigelow, SclioH. 

 This is doubtless aa autumnal state either of L. angustifolia or of L. halimifolia, with weak 

 stems prolonged to the length of a foot. From the foliage it might as well be judged to he a 

 state of the latter, but the rayless heads and flowers are those of the former. It seems to indi- 

 cate that the two species may not really be distinct. 



Laphamia BISETOSA5 Torr. in PL Wright^ 2, p. 106. Limestone rocks below Mount Carmel, 

 on the Eio Grande ; October ; Parry. Heads as large as in L. rupestris. 



Laphamia pissecta, Torr. in PL Wright, 2, p. 81, Crevices of limestone^ caiion of San 

 CarloSj and near Presidio del Norte^ on the Rio Grande ; Parry ^ Bigelow. 



PI. Wrighty 1^ p. 99, t. 9. Crevices in basalt 

 orence mountains^ Escondido creek^ etc.; Wrigh 



Laphamia (Pappothrix) rupestkis, Gray, 

 rocks on the Limpio ; also San Estaban, F 



BigeloWy Parry, 



Laphamia (Pappothrix) cinerea (sp. nov.) : nana, lanoso-tomentulosa ; caulibus subdif- 

 fusis uscLue ad apicem foliosis ; foliis oppositis rotundis subintegerrimis parvis, adultis subgla- 

 bratis ; pedunculis folia pauUo superantibus ; acheniis S99pius 3-4-nervatis ; pappo rigidio tnbo 

 corolla vix longiore. — On rocks near Escondido creek ; September ; Bigeloio. This differs from 

 the last, possibly not specifically, in its somewhat floccose woolly pubescence^ which renders all 

 the young parts canescent, its entire or very obscurely toothed leaves, its rather longer peduncles, 

 the longer proper tube to the corolla, its proportionally shorter pappus of stouter and more rigid 

 bristles ; and some of the achenia have four salient and unequally disposed ribs or nerves, bat 



the greater number three, of which two are usually approximate at one margin. The leaves 

 are from three to six lines in diameter, orbicular or broadly ovate, sometimes obscurely cordate, 

 entire, or obsoletely repand-toothed. 



Perityle coronopifolia, Gray, PI, Wright^ 2, p. 82. Cobra, New Mexico ; Bigeloio^ 

 WrtgJit. Arroyo de los Nogales, Sonora ; Schott. 



PL Wright, 2, p. 106. 



the 



Car m el ; Parry, 



issime 



Perityle aglossa, Gray, L c. With the preceding ; Parry. This is an annual^ not suffru- 

 tescent at the base, as stated in the published description j and the larger leaves are often two 

 inches wide. 



Pkrityle nuda, Torr. Mss.; Gray in Torr. Bot. WhippL Eep. p, 100. On the Gila, near 

 the Pimo village ; Parry, The rays are plainly yellow. 



Periiyle Emoryi, {Torr. in Emory ^ Pep. N. Mex, 1848, p. 142) : ligulis ovalibus ; pappo 

 uniaristato^ arista setiformi corolla breviore inferne nuda vel scabra, versus apicem parce retror- 



On the desert of the Colorado of the West ; Emory y 

 Schottj etc. Fort Yuma ; Major Thomas. This plant so closely resembles P. nuda in foliage, 

 (although the leaves are not alv/ays so much cut,) pubescence, in the size of the heads and 

 "broad scales of the involucre, in every respect, indeed, except in the awn to the pappus, (the 

 gc[uamellae of which are, perhaps, less united,) that it is far most probable the two are forms of 

 one species. In this case the name of P. Emoryi, which was indicated and published in 1848, 

 "Would, on all accounts, take precedence, and P. nuda be held as a variety of it. P. plumigera 

 is distinguished by the smaller heads, narrow^er involucral scales, and longer upwardly barbel- 

 late awn of the pappus. 



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