82 UNITED STATES AND MEXICAN BOUNDARY. 
LAPHAMIA ANGUSTIFOLIA? var. LACINIATA: caulibus elongatis diffusis; foliis oblongis subcuneatis 
laciniato-lobatis.—Crevices of rocks along the Rio Grande, Texas; October; Bigelow, Schott. 
This is doubtless an 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 be 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, 
Т.АРНАМГА BISEIOSA, Torr. in Pl. Wright, 2, p. 106. Limestone rocks below Mount Carmel, 
on the Rio Grande; October; Parry. Heads as large as in L. rupestris. 
LAPHAMIA DISSECTA, Torr. in Pl. Wright, 2, p. 81. Crevices of limestone, cañon of San 
Carlos, and near Presidio del Norte, on the Rio Grande; Parry, Bigelow. 
LAPHAMIA (PAPPOTHRIX) RUPESTRIS, Gray, Pl. Wright, 1, p. 99,4. 9. Crevices in basaltic 
E rocks on the Limpio; also San Estaban, Florence mountains, Escondido creek, etc.; Wright, 
Bigelow, Parry. 
LAPHAMIA (PAPPOTHRIX) CINEREA (sp. nov.): nana, lanoso-tomentulosa; caulibus subdif- | 
fusis usque ad apicem foliosis ; foliis oppositis rotundis subintegerrimis parvis, adultis subgla- 
bratis ; pedunculis folia paullo superantibus ; acheniis sepius 3—4-nervatis; pappo rigidio tubo 
corolle vix longiore.—On rocks near Escondido creek ; September ; Bigelow. 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, but | 
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, Pl. Wright, 2, p. 82. Cobre, New Mexico; Bigelow, | 
Wright. Arroyo de los Nogales, Sonora; Schott. | 
了 PERITYLE PARRYI, Gray, Pl. Wright, 2, p. 106. In a cañon of the Rio Grande below Mount 
Carmel; Parry. 
PERITYLE AGLOSSA, Gray, 1. с. With the preceding; Parry. This is an annual, not suffru- I 
tescent at the base, as stated in the published description ; and the larger leaves are often two 
inches wide. 
PERITYLE NUDA, Torr. Mss.; Gray in Torr. Bot. Whippl. Rep. p. 100. On the Gila, near 
the Pimo village; Parry. The rays are plainly yellow. 
Perry Emory, (Torr. in Emory, Hep. N. Mex. 1848, p. 142): ligulis ovalibus; pappo 
uniaristato, arista setiformi corolla breviore inferne nuda vel scabra, versus apicem parce retror- / 
sum vel patentissime barbellata-hispida.—On the desert of the Colorado of the West ; Emory, 
Schott, ete. Fort Yuma; Major Thomas. This plant so closely resembles P. nuda in foliage, 
(although the leaves are not always 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 
squamellae of which are, perhaps, less united ‚) that it is far most probable the two are forms of 2 
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. Р, plumigera 
is distinguished by the smaller heads, narrower involucral scales, and longer upwardly barbel- | 
late awn of the pappus. 
