Stephanomeria. COMPOSITiE. 473 



§ 2. Annual: heads 3-5-Jlowered. 



3. S. paniculata (Nutt. ! 1. c.) : stems stout, erect, striate, virgate, bearing 

 numerous short paniculate flowering branches ; cauline leaves linear, the 

 lower often toothed or sagittate at the base; those of the brandies minute; 

 mostly 5-flowered. 



Plains of the Rocky Mountains, near the Colorado of the West, Nuttall ! 

 — Stem 2 feet or more in height. Heads smaller and more slender than in 

 the preceding, terminal and lateral, and subsessile along the branchlets. 

 Achenia 5-angled, obscurely rugose. Bristles of the pappus 15-20, grayish, 

 at length brownish. 



4. S. exigua (Nutt. ! 1. c.) : diffusely much branched, the branches slender; 

 radical leaves runcinate-pinnatifid ; those of the branches reduced to minute 

 scales; heads 3-4- (sometimes 5-) flowered. 



Plains of the Rocky Mountains, with the preceding, Nuttall ! — Heads 

 still smaller than in S. paniculata, scarcely a line in diameter, 3-4 lines in 

 length. 



185. Pi,AFINESQUIA. Nutt. in trans. Amer. phil. soc. {n. ser.) 7. ;?. 429. 



Heads many-flowered. Scales of the cylindraceous involucre about 15, 

 somewhat in 2 series, linear-acuminate from a broadish base, with scarious 

 margins, subtended by a few short and spreading calyculate scales or bracts. 

 Receptacle naked, puncticulate. Achenia terete, nearly even, smooth or 

 the exterior minutely scabrous-pubescent, with the basilar areola terminal, 

 tapering above into a long filiform beak. Pappus of 12-15 uniform slender 

 and fragile plumose bristles, nearly in a single series, deciduous. — An annual 

 corymbosely much branched glabrous herb, with the aspect of a Sonchus. 

 Leaves runcinate or lyrately pinnatifid, clasping, lanceolate ; those of the 

 branches small. Heads rather large, terminating the fastigiate minutely 

 bracteate branches. Flowers white. 



R. Californica (Nutt. ! 1. c.) 



St. Diego, California, near the coast. — Stem 2-3 feet high, terete, purplish. 

 Involucre at length enlarging at the base and becoming conical, as in Son- 

 chus. Flowers fugacious, but little exserted, externally dark purple in the 

 centre of the ligule. Achenium shorter than the very slender and nearly 

 smooth beak. 



186. LEONTODON. Linn. (excl. spec.) ; Juss. ; Koch, syn. p. 418. 



Heads many-flowered. Involucre scarcely imbricated ; the exterior or 

 accessory scales shorter and bracteolate, in 1-3 series. Receptacle naked, 

 punctate, or sometimes fimbrillate in the centre. Achenia all similar, terete, 

 striate, transversely rugulose, tapering to the apex or somewhat rostrate. 

 Pappus persistent, composed of 1 or 2 series of plumose bristles, which are 

 scariose-dilated at the base, or the exterior short and filiform. — Acaulescent 

 perennial (chiefly European) herbs ; with radical, toothed, or pinnatifid 

 leaves. Flowers white. 



VOL. II. — (iO 



