Dy'<^'^i(^' COMPOSITE. gQ,^ 



3-lobed: heads small: rays broadly cuneate-oblong : style-appendacres short and 

 acutish : akenes oblong, densely hispid-ciliate : awns°of the pa^Itinuc llX 



1 r bZ 'itT:- 7 '^^''^"^t" P^^^-^--^cmella, Hooi. \i Arn.' Bot B^ W 

 loO. Boltonia § Dichetophora, sp, Benth. & Hook. Gen PI ii 269 



4. P. Emoryi, Torr. Sparsely hirsute as well as glandular : leaves round-cordate 

 or fan-shaped in outline 5 -9-cleft and the lobes copiously incise.l, the upper . It^.- 

 nate and ess lobed : scales of the involucre rather broad : rays shoi4, white, broadly 

 oval : style-appendages oblong and obtuse : akenes narrowly oblong, liispid-ciliate 

 awn of the pappus only one, very slender, sparsely barbellate above, or in 

 Var. nuda, Gray, with no awn. —P. nucla, Torr. in Pacif. E. Hep. iv 100 

 Desert region, along the Rio Colorado on both sides, near Fort Yuma, &c and on the Gila 

 Heads rather large for the genus, .3 or 4 lines high : receptacle broad, nearly Ha? Kays said hi 

 the Botany of the Mexican Boundary, p. 82, to be "plainly yello v " • hJt th; ticSt of D 

 Cooper's specunens fi-om the same district states that they are whit . So they are in khnS; 

 Guadaupe plant. Throat or expanded part of the disk-corolla shorter than fhe tube S ye 

 appendages certainly short and obtuse in the original specimens. Yet in onf seemingirof 



ctlifomLX"S/T;"r'"^' '.f ''''''' ^''T -y«' -11-led in 1870 on Carmen SnWower 

 Calitoiuia, by Dr. E. P«^»rcr, these appendages are somewhat longer and subulate-acute - So 

 also, m specimens recently collected by him on Guadalupe Island! This is eyidently a wintei-- 

 annual ; and so apparently are all the foregoing. eviucuciy a wintei 



5. P. leptoglossa, Gray. Cinereous-puberulent : leaves (of branches) small 

 and alternate, ovate and somewhat cordate, slender-petioled, coarsely or doubly 

 tootbed : scales of the involucre narrow : rays linear, rather long : style-appendages 

 hhform and acute : akenes linear-oblong, hispid-ciliolate : awn 'of the pappus only 

 one, very slender, barely scabrous. — PI. Fendl. 77. i 1 1 j 



California, Coulter. Known only from his collection. Heads large for the genus, 5 lines lon^ • 

 receptacle merely conyex._ Rays 4 to 6 lines long : disk-corollas with slender tube and a rema "k-' 

 ably long and narrow cylindrical throat. 



\I:7,T^^^^' ?■ ^^^?f^' and P. CORONOPIFOLIA, Gray, the latter with distinctly white rays, 

 belong to a region further eastward. ^ ' 



85. DYSODIA, Cay. 



Head many-flowered, with few or numerous pistillate rays or sometimes none ; all 

 the flowers fertile. Involucre cylindraceous or campanulate, of rather rigid equal 

 scales in a single series, often united below, commonly subtended by a row of bracts. 

 Eeceptacle flattish, naked, often alveolate, fimbrillate, or hirsute. Eays entire or 

 2-.3-toothed at the apex : disk-corollas narrow, 5-toothed. Style-branches of the 

 perfect flowers slender and tipped with a subulate or nearly filiform hispid append- 

 age. Akenes linear or linear-cuneate, 4 - 5-angled or many-nerved. Pappus single, 

 of 10 (or rarely more) firm chaff^y scales which are deeply dissected into many rigid 

 scabrous bristles, about equalling the corolla. — Herbs (all Mexican and X. Ameri- 

 can) ; with strong and mostly disagreeable scent (whence the generic name), opposite 

 or alternate leaves, and peduncled heads of yellow, orange, or reddish flowers : scat- 

 tered oil-glands rather conspicuous in the fohage and involucre. 



D. CHRTSANTHEMOiDEs, Lagasca, common along the waters of the Mississippi and thence to 

 approach California by way of Arizona. 



Mexico, may ; 



p. SPECiosA, Gray, a striking and apparently shrubby sjjecies, with rounded ternate leaflets 

 and large heads, was discovered at Cape San Lucas in Lower California, far beyond our limits. 



the toUowing have been found in the State. 



1. D, porophylloides, Gray. Loosely mucli Ijranclied. al^ont 2 f(>et liigb, 

 glabrous : branches slender and rigid, striate, terminated by middle-sized heads : 



