104 UNITED STATES AND MEXICAN BOUNDARY. 



g roc'k 



pubescentibus, argute denticulatis ; inyoliicri superne sensim attenuatis acutis. 

 Bacliimba^ Chiluiahim; T'Imrber. Einggokrs Barraclc^ on the Eio Grande, Texas ; Schott. Yar. 

 ANGUSiiFOLiA ] foliis lato vel angiisto-lanceolatis margine plerumqne revolutis subsericeis sajpius 

 integerrimis. T. angustifolia, Grayy PL Wright. 1^ p, 128, & 2^ p. 102. RavineSj Santa Cruz, 

 Sonera ; El Paso and Flounce mountains, New Mexico ; Wright^ Parry ^ Bigelo2i\ Schultz, Bip. 

 (in Botany of the Herald^ p. 314) refers these all to T. frutescenSj wbich 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 T. angustifolia, DC. (Berlandier*s Ko, 1284 and ISoS,) 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^ PI. Tlmrher^ p. 324. Rocky hills, near Santa Cruz, Sonora ; Thurher. 

 Dr, Schultz has recently referred Perezia to Trixis, perhaps with reason, as it is difficult to 

 draw a limit between them. 



Wright. 1, p. 127- On the Rio Grande, Rio Frio, Limpio, etc.; 



Wriaht. Biaeloio, Pai 



Perezia nana, Gray, PL FcndL p. Ill, & 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. 



Perezia runcixata, Gray^ I. c. From the lower Rio Grande to Chihuahua. The fascicled 

 roots become tuberous-thickened below, like those of a Peony or Dahlia.* 



Leria :nutans, DG. Western and southern Texas, to the Rio Grande. 



Calais linearifolia, DC. Prodr. 7, p. 85 ; Gray^ PL Wright. 2,^. 102. Near San Diego, 

 California ; Parry. New Mexico on the Rio Grande, Organ mountains, and Lake Gusman ; 

 Wright^ Bigelow. Guadalupe caiion, Sonora; CapL Sraith. 



Calais Parryi, {Gray, in Bot. WhippL Rep. p. 112, adn.) : scaposa, fere glabra; foliis 

 lineari-lanceolatis soepius pinnatifido-Iaciniatis ; involucri squamis triseriatis ovatis oblongisve 



subobtusis, exterioribus gradatim brevioribus ; ovariis l^vibus ; 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 Ca 

 FendL : but the scales of 



C. macrochieta, Gray^ PL 



is shorter and more denticulate ; the leaves also are shorter and mostly obtuse. In C. macro- 

 chaeta, the scales of the involucre are lanceolate and gradually very taper-pointed ; and the 

 slender awn is scarcely scabrous. 



Calais Douglasii, DC. Prodr. 7,^?. 85. Near San Diego, California, March; Parry. Very 



w ^ 



<5In Berlandier's rdiguice I find still another Perezia viz ; 



Peuezia thtbsoidea (sp. nov.) ; glanduloso-scabrida ; ramis floridis strictis ; foUis confcrtis siibimbricatis oblongis ovatis ve 

 utrinque angustatis pungenti-acutis basi sessili vix ant ne vix ainplexkaulibus rigidis spinulu^o-servulatis reticulatis subtns 

 prtesertim glanduloso-puberwlis ; ramuliii 3-5 cepbalig brevibus folia parva lafctgerriina bracteiforroia gerentibus in 

 thyrsum elongatnm gpidforme congestiR ; involucro cylindrico 10-I2-floro; eqnainis linear i-lanceolatis sennim subuluto- 

 acuminatis appre^ia, intimis pappo rigidulo copioso (hand clavellato) a^quilongis. — Guanaxuato, Mexico, No. 1329. Base of 

 the stem not seen, nor the leaves much below thoFC which bear flowering brancblets in their axils. Lowest leaves Been 2^ 

 inches long, gradually decreasing to an inch, and shorter than the flowt ring branchlets they subtend ; these altogether foTUi 



dense and elongated thyrsns of a foot or so 5n length. Heads 9 or 10 lines long Scales of the involucre glandular, imbri- 

 cated in several series, the exterior passing into bractlets. Pappus whitish, pluriserial. This can hardly be the Perezia 

 moschata of Lallav. and Lex , or any other described specieft. 



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