OP ARTS AND SCIENCES. 29 



erately hairy or glabrate on the angles, smooth and mostly even on the 

 face ; the leaves usually more pinnate ; the flowers inclined to be more 

 numerous. As in the preceding section, the species are distinguished 

 mainly by the pappus. Of the two Mexican species, S. virgata, DC, 

 comes neai'est to S. Wislizem, to which belongs a plant of Galeotti 

 from Oaxaca, which I have as no. 2049, probably an error for " 2045." 

 This number Hemsley has referred to S. ahrotanoides. S. Bunari- 

 ensis, Hook. & Arn., S. octoaristata, DC. (to which must belong Man- 

 don's no. 71 and Spruce's 5789), and S. isopappa, Benth,, appear to 

 be good species. 



Hymenopappus Mexicanus. Tomento floccoso-canescens, 1-2- 

 pedalis e caudice perenni ; foliis aut integerrimis aut pinnatipartitis, 

 lobis oblongo-lanceolatis vel caulinorum linearibus; capitulis hixe sub- 

 corymbosis ; involucri bracteis ovatis ovalibusque apice tantum peta- 

 loideis ; corolla (in stirpibus Mexicanis ut videtur sordide alba, in 

 JSTeo-Mexicauis lutea) lobis parvis fauce campanulata dimidio brevi- 

 oribus ; acheniis secus angulos pubescentibus, faciebus glabellis sen 

 enerviis ; pappo minuto (e paleolis minimis) vel obsolete. — In the 

 higher mountains near San Luis Potosi, Mexico, Sept. 1876, Schaffner, 

 seemingly whitish-flowered. New Mexico, in a mountain ravine, near 

 the Mimbres, Wright, 1851, a single specimen, reported in PL Wright. 

 ii. 94 as H. Jlavescens, var. ? Pinos Altos Mountains, Greene, July, 

 1880, and- Mogollon Mountains, Rushy (no. 179), Sept. 1881. The 

 corollas in Wright's specimens seem to be whitish, but are too old ; in 

 Greene's and Rusby's they are clearly yellow. The species is ex- 

 tremely well marked.* 



* In all the other species the two or three nerves on the faces of the akenes 

 are conspicuous ; at maturity not rarely as promiuent as the five angles. In 

 H. Mexicanus they are faintly indicated. 



H. FiLiFOLius, Hook., seems to be the only other truly perennial species, and 

 to include H. /uiezis, Nutt. ; for flowers appear to vary from dull white to yellow. 

 The teeth of the corolla are much shorter than the throat ; the pappus neither 

 very short nor minute, as originally described, though it may be hidden by the 

 long villosity of the akene. 



H. TENUiFOLius, Pursh, and H. flavescens, Gray, are biennials, leafy- 

 stemmed and cymosely polycephalous, with conspicuous pappus, and lobes of 

 the corolla more or less shorter than the throat. 



H. ARTEMisi^FOLius, DC, with coroUa-lobes fully as long as the throat, 

 villous-pubescent akenes, and a rather conspicuous pappus, belongs rather with 



H. scABios.?Eus, L'Her., and H. cortmbosus, Torr. & Gray ; biennials, with 

 larger limb to the corolla, more white-scarious petaloid and lax involncral 

 bracts, and minutely pubescent akenes, with very short and sometimes obso- 

 lete pappus. 



