CATALOGUE. 155 



Erigeron speciosum, DC. — Stem erect, glabrous or nearly so, 1-2° 

 high, strongly furrowed, branching; entire stem leafy, branched above; 

 radical leaves spatulate, petioled, those of the stem sessile, acuminate, 

 slightly ciliate; infloresence corymbose; scales of the involucre in two or 

 three series, crowded, linear, much attenuated at the tip, hirsute, and with 

 scarious margins ; rays over a hundred, narrow, purple ; achenia slightly 

 hairy, distinctly ribbed ; outer pappus present, but not evident. — Western 

 New Mexico, Loew. As this species would here appear to be much out of 

 its range, it may not be out of place for me to state I have compared the 

 specimen with authentic specimens taken from the Cambridge Botanic 

 Garden, and find them the same throughout. 



Erigeron cespitosum, Nutt. — San Francisco Mountains, Arizona, 

 and Utah. 



Conyza* Coulter i, Gray. — Softly pubescent and very slightly viscid, 

 erect, somewhat branched at summit, G'-2° high, leafy to the top; leaves 

 linear or linear-oblong, sessile, somewhat clasping (or the lower spatulate), 

 entire or irregularly pinnatiftd or toothed; panicle close and crowded; 

 heads small, 2" long; scales of the involucre lanceolate, acute, with scarious 

 margins and a green middle. — Mount Graham, Arizona, at 9,000 feet (743), 

 where it is extremely common on the more open grounds, and strikingly 

 suggestive, in habit, of Erigeron Canadense elsewhere. 



BaccharisI c^erulescens, DC. — Shrubby at base, 6-8° high; branches 

 slender; younger shoots and leaves smooth; leaves lanceolate, acute, irregu- 

 larly sinuate-dentate, tapering to a short petiole, 3-7' long and 4-7" wide; 

 inflorescence in a loose paniculate corymb; each head on a slender pedicel 

 with a small subulate bract at base; scales of involucre ovate, with a 



* "Conyza Linn. — Heads many-flowered, heterogamous, but not radiate ; the pistillate flowers in 

 many series and more numerous tbau the fertile ones, with only a filiform truncate corolla sborter tbau 

 Ibe style; tbe few central flowers tubular and perfect, or some of tbem infertile. Involucre of narrow 

 numerous scales. Receptacle flat or convex, naked. Style-appendages short. Achenes flattened, usually 

 nerved only on tbe margins. Pappus as in Erigeron, in ours of simple scanty capillary bristles," etc. — 

 Ghav, in Fl. Cal. 1, p. 332. 



tBACCHARis, Linn. — Homogamous, dioecious. The sterile flowers with a perfect style, but an 

 abortive ovary; style sometimes undivided; corolla tubular and pappus shorter and more tortuous. 

 Fertile flowers pistillate only, corolla filiform and truncate. Achenia terete or somewhat compressed, 

 ribbed. Heads many-flowered; scales of the involucre dry, in several series, the outer ones shorter; 

 receptacle flat or flattisb.— Herbaceous or low shrubby plants, with alternate leaves aud dull-coloied 

 inconspicuous (somewhat conspicuous in Ii. Wrujhtii, Gray) flowers. 



