158 BOTANY. 



Melampodium* cineeeum, DC— Woody at base, 4-12' high, simple or 

 much branched, covered with a short silky pubescence ; leaves numerous, 

 linear or slightly linear-spatulate ; rays white (about 8), emarginate, oblong 

 or lanceolate.— A common plant in the drier parts of New Mexico and 

 Arizona (96, 327). 



BERLANDiERAf lyrata, Benth. — Erect, branching at, base; radical 

 leaves lyrate on long petioles; terminal segment much the largest and- (as 

 well as the others) irregularly toothed; upper leaves lyrate but sessile; 

 rays 6-8, orange, with darker veins, emarginate, tomentose outside and 

 especially on the veins. Whole plant is softly tomentose.— Covero, N. 

 Mex. (98). 



Parthenium incanum, H. B. K. — Suffrutescent and much branched; 

 younger branches and leaves canescently tomentose ; leaves clustered, 

 oblong, deeply cleft or pinnate, 5-8-parted ; divisions obtuse, 9-1 5" long 

 and k.-G" wide, ashy color from the dense, short pubescence ; inflorescence 

 corymbose-paniculate ; involucral scales in two series, outer oblong, inner 

 broadly oval or nearly round and scarious with a ciliate-fringed margin ; 

 rays short, ligules obcordate ; achenia flattened obovate and with a pappus 

 of two short, persistent awns ; disk-flowers shorter than the obovate, hyaline, 

 ciliate-fringed scales which enclose them. — Camp Bowie, Southeastern 

 Arizona (453). 



Hymenoclea monogyra, T. & Gr. — Arizona (778). 



Ambrosia psilostachya, DC. — Utah, and (529, 697) Arizona. 



Ambrosia aptera, DC — Probably hardly sufficiently distinct from 

 some forms of A. trifida, L , but having, however, wingless margins to the 

 petioles. — Southern Arizona (695, 696). 



* Melampodium, L. — Rays in a single series, fertile; flowers of the disk with an abortive style. 

 Involucre double, the outer series of (4-5) broad foliaceous bracts, which are often connate at base, 

 the inner as many as the ray-flowers and enclosing their achenia. Receptacle strongly convex. Chaff 

 thin, deciduous. Achenia (of the fertile flowers) ovoid, embraced by the hooded inner scales of the 

 involucre. 



t Berlandieka, DC— Many-flowered, ligulate rays pistillate. Disk-flowers with an undivided 

 style. Scales of the involucre in three series, the outer small, oblong or oval, the second set larger and 

 obovate, the inner ones largest, rhomboidal, reticulated, bearing on the inner faces the flat, wingless achenia, 

 of the ray-flowers. Pappus of the ray of two minute caducous teeth or short awns. Inner face of the 

 ray-achenium is mostly oovered by the chaff of two sterile flowers. Pappus of the disk reduced to the 

 merest crown or border. 



