94 UNITED STATES AND MEXICAN BOUNDARY. 



PoROPEYLLUM MACROCEPHALUM, BG. Fvodr. 5, p. 643. Sonora, on the Sonoita ; Wright. Near 

 Santa Cruz ; Thurber. 



PoROPHYLLUM QreggiIj Gray ^ PI. Wright^ 1, p. 120. Dry liills, etc., southern part of New 

 Mexico and adjacent districts in Chihuahna ; Wright^ Bigeloiv^ Captain Smith. On the Colorado 

 of the West ; Schott. 



PoROPHYLLUM SCOPARIUM, Gray, I. c. On the San Pedro and Puercos, El Paso^ etc.; Wright ^ 

 BigeloiOj Thurher. 



Agassizia suA'NTiS; Gi'uy (£ Engelm. PL Lindh. 2^ p. 229, Gravelly hills, southern and western 

 Texas, on Eock creek, etc.; Parry ^ Bigeloio. 



Gaillardia PiNNATiFiDA, Torr. Common from Eock creek, the Pecos, etc., to El Paso, Cohre, 



etc., New Mexico. 



Foug.; Torr. & Gray^ Z. c. Common from 



Gaillardia lanceolata, Michx. Eastern Texas, on the coast ; Schott. 



Palafoxia linearis, Lag.; DC. Prodr. 5, p, 124. Diluvial banks of the Colorado^ Sonora; 

 Schott. Fort Yuma, California ; Major TJiomas. Chihuahua, east of Eio Santa Maria; Schott. 



Palafoxia Hookeriana, Torr. d Gray, FL 2, p. 368. Valley of the Eio Grande below San 



Elizario ; TFrightj Bigelow. Sand hills, Medanos ; Thurher. 



Palafoxia Texana, BC. Prodr. 5, p. 125. Texas from San Antonio to Eagle Pass. Los 

 Moros, New Mexico ; Bigelow. 



Palafoxia callosa, Torr. (& Gray^ I. c. Prom the Guadalupe river, Texas, to the Pecos. 



Florestina tripteris, DC. Prodr. 5, p. 655. On the Pecos, Escondido, etc.; Bigeloio^ Wright^ 

 Parry. 



Ch^nactis tenuifolta, Nutt.; Torr. & Gray^ Fl. 2,^. 370. San Diego, California; Thurber^ 

 (a pretty large plant, a foot high,) Schoit^ (a small form, only 3 or 4 inches high.) 



Ch^nactis stewoides, HooJc. d Arn.\ Gray^ PI. Wright. 2, p. 94. Hills, near Camp Fillmore, 

 New Mexico ; Bigeloio^ Wright^ Cooke's spring, New Mexico ; Thurher. 



CH.ENACTIS CARpnocLiNiA (sp. nov.) : annua? lanuloso-pubescens, mox glabrata, subviscosa; 

 caule ramosissimo; foliis 1-2-pinnatipartitis, segmentis parvis linearibus (1-3 lin. longis); 

 capitulis subcorymbosis ; involucre viscoso ; corollis albidis ? radii limbo ampliato sed regular! 

 discum baud superantibus, pappi paleis 4 ovato-lanceolatis acuminatis ; receptaculo paleis 



J. 



nonnullis setaceis involucrum aequantibus inter flores onusto. — Gila and Colorado desert; Schott. 

 Fort Yuma, E. California ; Major Thomas. Plant 4 to 9 inches high, resembling slender forms 

 of C. stevioides. Heads corymbose-panicled, half an inch long, on short and slender peduncles, 

 12 — 25-flowered. Involucre either glandular-viscid or hirsute with viscid hairs. The remark- 

 able peculiarity of the species consists in a set of filiform or setaceous persistent palea3 on the 

 receptacle, 5 to 10 in number, subtending as many disk-flowers ; but in every other respect the 

 plant is a true Cheenactis. 



Hymenopappus luteus, Niitt.; Gray^ PL FendL p. 97. Stony hills, Cobre, New Mexico; 

 Bigelow^ Wright; and Mimbres ; Thurher. Guadalupe canon; Captain Smith. Cordilleras 



^» 



longer than llie achenium ; tlie bristles, or rather aristiform paleae, consimilar, except that a few are smaller, tapering upwards, 

 simple, but all more or less coliereut at the very base, so that they fall off in a ring". There are faint indications of some dark 

 glands on the foliage, which, if confirmed in better specimens, m.ay justify a reference of the genus to the Tagetinea?, in which 

 case it would make as perfect a transition between that subtrihe and the Heleniese as another genus of the same region 

 (Sartwellia) does between the latter and Uie Flaverie©. 



