104 UNITED STATES AND MEXICAN BOUNDARY. 
pubescentibus, argute denticulatis ; involucri superae sensim attenuatis acutis.—Among rocks, 
Bachimba, Chihuahua; Thurber. Ringgold’s Barrack, on the Rio Grande, Texas ; Schott. Var. 
ANGUSIIFOLIA ; foliis lato vel angusto-lanceolatis margine plerumque revolutis subsericeis sepius 
integerrimis. Т. angustifolia, Gray, Pl. Wright. 1, р. 128, 62, p. 102. Ravines, Santa Cruz, 
Sonora ; El Paso and Flounce mountains, New Mexico; Wright, Parry, Bigelow. Schultz, Bip. 
(in Botany of the Herald, p. 314) refers these all to T. frutescens, which may well be the case if 
that species includes forms with thickish and silky pubescent leaves as well as tapering acute 
scales of the involucre; but, on the other hand these narrow-leaved varieties quite as clearly 
run into Т. angustifolia, DC. (Berlandier’s No. 1284 and 1353,) which Schultz keeps separate. 
The latter belong to an arid region, and certainly look widely different from Berlandier’s No. 
2100 and 2230, which I had supposed to answer to the type of T. frutescens. 
— PEREZIA THURBERI, Gray, Pl. Thurber, p. 324. Rocky hills, near Santa Cruz, Sonora; Thurber. 
Dr. Schultz has recently referred Perezia to Trixis, perhaps with reason, as it is difficult to 
draw a limit between them. 
РккктгА УУвтантц, Gray, Pl. Wright. 1, p. 127. On the Rio Grande, Rio Frio, Limpio, etc.; 
Wright, Bigelow, Parry, Schott, Thurber. 
PEREZIA NANA, Gray, Pl. Fendl. p. 111, & Pl. Wright. l. c. Gavelly or rocky hills, from the 
Rio Grande, Texas, to the San Pedro, Sonora. The name is not always appropriate, as the 
plant is sometimes a foot high. 
了 EREZIA RUNCINATA, Gray, l. с. From the lower Rio Grande to Chihuahua. The fascicled 
roots become tuberous-thickened below, like those of a Peony or Dahlia.* 
LERIA nutans, DC. Western and southern Texas, to the Rio Grande. 
CALAIS LINEARIFOLIA, DC. Prodr. Т, p. 85; Gray, Pl. Wright. 2, p. 102. Near San Diego, 
— California ; Parry. New Mexico on the Rio Grande, Organ mountains, and Lake Gusman ; 
Wright, Bigelow. Guadalupe cafion, Sonora; Capt. Smith. 
Catars Parry, (Gray, in Bot. Whippl. Hep. p. 112, adn.): scaposa, fere glabra; foliis 
lineari-lanceolatis sepius pinnatifido-laciniatis ; involucri squamis triseriatis ovatis oblongisve 
subobtusis, exterioribus gradatim brevioribus ; ovariis levibus; pappi paleis oblongis apice 
bifidis arista e sinu exserente barbellato-scabra dimidio brevioribus.—Near San Diego, California; 
March; Parry. The specimens are too young to give the complete characters. The plant 
belongs to the section Calocalais, and in the pappus most resembles C. macrocheta, Gray, Pl. 
Fendl. ; but the scales of the involucre are much broader and blunt, and the awn of the pappus 
is shorter and more denticulate ; the leaves also are shorter and mostly obtuse. Іп C. macro- 
chæta, the scales of the involucre are lanceolate and gradually very taper-pointed ; and the 
slender awn is scarcely scabrous. 
Carars Dovarasir, DC. Prodr. Т, p. 85. Near San Diego, California, March; Parry. Very 
*In Berlandier's reliquie I find still another Perezia viz: 
PEREZIA THYRSOIDEA (sp. nov.): glanduloso-scabrida ; ramis floridis strictis; foliis confertis subimbricatis oblongis ovatisve 
utrinque angustatis pungenti-acutis basi sessili vix aut ne vix amplexicaulibus rigidis spinuloso-serrulatis reticulatis subtus 
presertim glanduloso-puberulis ; ramulis 3—5-cephalis brevibus folia parva integerrima bracteiformia gerentibus in 
thyrsum elongatum spiciforme congestis; involucro cylindrico 10-12-floro; squamis lineari-lanceolatis sensim subulato- 
acuminatis m aa pappo rigidulo copioso (haud clavellato) equilongis.—Guanaxuato, Mexico, No. 1329. Base of 
the stem not seen e leaves much below those which bear flowering branchlets in their axils. west leaves seen 23 
inches long, vind a to an inch, and shorter than the flowering branchlets they subtend ; these altogether form 
a dense and elongated thyrsus of a foot or so in length. Heads 9 or 10 lines long Scales of the involucre glandular, imbri. 
cated in several series, the exterior passing into bractlets, 22 whitish, pluriserial. This can hardly be the Pere еда 
moschata of Lallav. and Lex., or апу other described speci 
