336 COMPOSITE. Hymenopappus. 



-! Stems leafv, from a biennial root a foot or two high : heads rather numerous and corvmbo?ely 

 cymose, on rather short slender peduncles : corolla-tube slender, throat short, and lobes rather 

 long. 



H. flavescens, GRAY. Densely white-tomentose, sometimes glabrate in age : leaves once 

 or twice or eveu thrice piuuately parted ; the divisions or lobes from narrowly to rather 

 broadly linear : heads 4 or 5 lines high : bracts of the involucre rouudish-obovate or ovate, 

 with greenish-white or barely yellowish margins : corolla from yellowish to yellow, and 

 short-campauulate throat almost equalled by the lobes : akenes rather short-villous : pale* 

 of the pappus spatulate, usually only half the length of the slender corollu-tu.be. PI. Fendl. 

 97, & PL Wright, i. 121, ii. 94 (excl. the last var.); llothrock in Wheeler Exped. vi. 167, 

 where one form is printed " //. canesccns." H. robustus, Greene, Bull. Torr. Club, ix. G3, 

 stout specimens of the form with finely much divided leaves and somewhat reduced pappus. 

 Sandy plains and valleys, W. Texas and New Mexico to Arizona. (Adj. Mex.) 



H. tenuifolius, Pcnsii. Lightly tomeuto.se, or soon glabrate and green : leaves rather 

 rigid, once or twice (or radical thrice) pinnately parted into very narrowly linear or fili- 

 form divisions, their margins soon revolute : heads only 3 or 4 lines high : involucre more 

 erect and close ; its bracts oblong-obovate, greenish with whitish apex and margins : corolla 

 dull white ; its lobes moderately shorter than the throat : palete of the pappus shorter than 

 the corolla-tube, oblong-spatulate : akenes long-villous. Fl. ii. 742; Nutt. Gen. ii. 139; 

 DC. Prodr. v. G58; Torr. & Gray, 1. c. Plains, from Nebraska to Arkansas, Texas, and 

 apparently also in Utah. 



-I H Stems clustered on a perennial caudex, leafy below, naked above, bearing few or solitary 

 comparatively large heads. 



H. filif olius, HOOK. Tomentose-canescent, or somewhat denudate and glabrate : stems a 

 span to a foot high, sometimes scapiform : leaves nearly of //. tenuifolius, or of more filiform 

 rigid divisions : heads a third to half inch high : bracts of the involucre oblong or obovate- 

 oblong, largely green or else white-woolly, the tips whitish or purplish-tinged : corolla yel- 

 lowish-white or sometimes clear yellow, its reflexed lobes or teeth very much shorter than 

 the throat : akenes very long-villous : palete of the pappus equalling or much shorter than 

 the tube of the corolla, but commonly equalled by the villosity of the akene. Fl. i. 317, 

 but the pappus is not " extremely minute." If. jilifolius II. lutens, Nutt. Trans. Am. Phil, 

 Soc. I.e.; Torr. & Gray, Fl. I.e. //. tenuifolius, Eaton in Bot. King Exp. 173. Rocky 

 Mountain plains, from Nebraska and Montana to New Mexico, mountains of Arizona, and 

 southern borders of California. The i'orms referable to H. luteus are more white-tomentose, 

 have shorter and more crowded lobes to the leaves, and southward have almost scapiform 

 stems. Northeastern forms are greener, more leafy, and with smaller heads, approaching 

 H. tenuifolius. 



# * * Lobes of the honey-colored or yellow corolla much shorter than the throat: akenes broad, 

 the faces almost destitute of nerves: pappus obsolete or wanting: root perennial: fl. July-Oct. 



H. Mexicanus, GRAY. Densely floccose-tomentose, sometimes denudate in age, a foot or 

 two high from a thick root or caudex : radical leaves from lanceolate to spatulate, and from 

 entire to piuuately parted, the lobes entire ; upper cauline leaves linear or lanceolate, often 

 entire : heads few or several and loosely corymbose-paniculate, 4 lines high : bracts of the 

 involucre oval or ovate, green with yellowish tips : akenes slightly pubescent and glabrate. 

 -1'mc. Am. Acad. xix. 29. H. flavescens, var.? Gray, PI. Wright, ii. 94. Mountain 

 raviues, New Mexico, \Vri<jht, Greene, Rushy. (Mountains near San Luis Potosi, Mexico, 

 these certainly perennial, Schaffher.) 



149. FLORESTfNA, Cass. (Probably dedicated to a female friend.) - 

 Slender annuals (of Mexico and its northern borders), leafy-stemmed, loosely 

 paniculately branched, pubescent and above beset with stipitate glands : all but 

 the lowest leaves alternate, petiolate, simply palmately or pedately divided into 

 entire segments, rarely entire : heads loosely paniculate, quarter-inch high : 

 flowers white or flesh-color, in summer. -- Bull. Philom. 1815, & Diet. xvii. 155, 

 t. 86 ; DC. Prodr. v. 655, excl. spec. Consists of the Mexican F. pedata. Cass., 

 and the following. 



