70 PLA>T^i: WRIGHTIAN^E. VI. 



— Mountain valleys, between the San Pedro and Santa Cruz, Sonora ; Sept. 

 (11 '27.) — Stems 1 to 3 inches long, in the cultivated plant longer and more pro- 

 cumbent, slender. Leaves 12 to 18 lines long, H to 2 lines wide, rather fleshy. 

 Peduncles 4 to 6 inches long, the earliest scapiform, naked or with a few minute 

 bractlets. Scales of the campanulate involucre 3 lines long, linear, rather obtuse, 

 bearing usually only a single gland. Ligules 12 or 13, oblong. Disk-flowers 40 

 or more. Achenia puberulent. Pappus in the ray of two slender awns or stout 

 bristles, as long as the tube of the ligule, not scarious-dilated at the base, minutely 

 scabrous ; in the disk of 30 or 40 capillary and very unequal scabrous bristles ; the 

 longer ones little shorter than the corolla. 



P. iMBERBis (sp. nov.) : glaberrima, ultrapedalis ; caulibus e radice perenni pluri- 

 mis erectis gracilibus rigidis angulatis apice paniculato-cymosis polycephalis ; foliis 

 anguste linearibus secus margines parce nigi'o-glandulosis baud setigeris ; capitulis 

 pedicellatis ; involucri squamis 5 linearibus obtusis glandulis nigris oblongis linea- 

 ribusve parce notatis ; ligulis 5 oblongis ; fl. disci 5 - 7 ; acheniis hirtellis ; pappo 

 conformi e paleis 2-5 insequalibus ssepius dimidiato. — On the Sonoita, near De- 

 serted Kancho, Sonora; Sept. (1399.) — This singular species, with the char- 

 acters otherwise of a genuine Pectis, is remarkable for the total absence of cilia 

 fringing the base of the leaves, as well as for its size ; the stems being a foot 

 or more in height. The root is rather ligneous. The leaves are 1^ to 2 inches 

 long, only a line wide, and perfectly entire. Peduncles an inch or less in length, 

 sparingly and minutely bracteolate. Involucre 4 lines long ; the scales conduplicate 

 around the ray-achenia. Ligules 3 lines long, yeUow, changing, as do also the 

 disk-flowers, to red or purple. Disk-corollas slightly bilabiate, the teeth each 

 dotted with a dark gland. Pappus nearly alike in the disk and ray, mostly of 

 about 5 lanceolate palea?, three of which are minute, and two half the length of 

 the disk-corolla, or in the central achenia aU small and nearly equal ; in the exterior 

 achenia more or less unilateral. 



Trichocoronis rivdlaris, Gray, PI. Fendl. p. QQ. In Piedra Pinta Creek, 

 Western Texas ; May. ( 1 1 28. ) 



CcELESTiNA ACxERAToiDEs, H. B. K. ; DC. Proclr. 5. p. 108. Crevices of rocks, 

 Guadalupe Pass, between the San Pedro, Sonora, and the copper mines; Oct. 

 (1129.) 



Stevia macella (sp. nov.) : annua, subpedalis, viscoso-pubens ; foliis tenui- 

 membranaceis glabellis ovatis grosse dentatis triplinerviis basi acutis in petiolum 

 marginatum decurrentibus, superioribus alternis ; capitulis paniculatis breviter pedi- 

 cellatis ; involucri squamis acutis ; pappo paleaceo brevissimo subcoroniformi floris 

 unici exaristato ctet. aristis 3 corolla sublongioribus. — On shaded rocky clifis of 

 Coppermine Creek, New Mexico ; Oct. (1130.) — Stem slender, erect, with short 

 paniculate flowering branches. Leaves very thin and membranaceous, about an 

 inch and a half long, and an inch wide, all more or less cuneate at the base, on 

 slender margined petioles ; the lower only opposite. Heads rather numerous in 

 terminal and lateral short corymbose panicles, longer than the pedicels. Involucre 

 3 lines long, viscous-pubescent. Corolla 2 lines long, whitish. Awns of the pap- 



