178 COMPOSITE. (composite family.) 



or sometimes thinly tioccose, the short dtcmrent bases or aduate auricles rathei 

 at all gland uiar or hear g-scented : heads in sing'r or Jew close 

 (jlomerules terminating the stem or branches : iuvolucre hemispherical, white 

 or yellowish, becoming ru?ty-tinged. — G. luteo-a/bum, var. Sjirengelii, Eaton. 

 From Texas ami Colorado to S. California and N. Oregon. 



2. G. decurrens, I - Stem stout, 2 or 3 feet high, corymbosely 

 branched above and bearing c/moselg crowded glome rwts of broad heads : leaves 

 very numerous, lanceolate or the upper lit: — / adnate-decurrent. the 



'ice becoming naked and green in age and with the stem glandule 

 cent or viscid, white-woolly beneath, strong!-/ balsamic-scented: involucre cam- 

 pauulate, white, becoming rusty-tinged. — Am. Jour. Sci. i. 330. From Texas 

 an I New Mexico to Washington and British Columbia, and eastward to New 

 Eug and. 

 * * Involucre less imbricated, more involved in woo 1 , the scarious tips of tkt 



equal bracts inconspicuous and d - le and leaj -Iracte- 



ate, onlg a line or so in length: low and branching annuals, a few niches or 

 rarelg a foot high : akenes either smooth or scabrous. 



3. G. palllStre, Xntt. Loosely jloccose with long wool, erect, at length 

 diffuse or weak : leaves 3 to 5 lines wide, sjxitulate or the uppermost oblong or 

 lanceolate: tips of the linear involucral bracts white, obtuse. — In moist 

 grounds from New Mexico to Wyoming and westward. 



4. G. strictum, Gray. Appresstd-woollg : stem strict and simple, a span 

 to a foot high, sometimes branching or with ascending stems from the 1 ase : 

 leaves all linear, seldom a line wide : heads in spicateig disposed glomerules in 

 the axils or on short lateral branches : involucral bracts with brownish or some- 

 what whitish tips, obtuse. — Pacif. R. Rep. iv. 110. Rocky [Mountain region, 

 from Wyoming to New [Mexico and Arizona. 



21. MELAMPODIUM, L. 



Branching herbs, with opposite mostly sessile leaves, and pedunculate heads 

 terminating the branches or in the forks. In our species the rays are con- 

 spicuously exserted and white, and the fructiferous bracts hooded. 



1. M. cinereurn, DC. Branched from the base, a span to a foot high, 

 cinereous or even silvery-canescent with a close pubescence, or greener : leaves 

 linear or the lower lanceolate or spatnlate, entire or undulate, or even sinuate- 

 pinnatifid: ligules 5 to 9. cuneate-oblong, 2 to 3-lobed at apex, 3 to 6 lines 

 long : bracts of rhe involucre ovate, appressed, slightly united at base : fruc- 

 tiferous bracts nearly terete, somewhat incurved, mnricate with sharp tul ercles ; 

 its hood about the length of the body and very much wider, neaily smooth, 

 its truncate and usually even margin commonly incurved. — From S. and E. 

 Colorado to Arizona, Texas, and W. Arkansas. 



22. SILPHIUM, L. Rosin-weed. 



Tall and coarse perennials: with resinous juice, large leaves, and ample 

 pedunculate heads of yellow flowers Our species is the u Compass-Plant," 



with alternate deeply piuuatifid or bipinnatifid leaves, and large heads (sessile 

 or nearly so) racemosely disposed along the naked summit, and very rough 

 herbage. 



