336 COMPOSITJE. ffymenopappus. 



H— Stems leafy, from a bieimial root a foot or two high : heads rather numerous and corymbopely 



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



long. 



H. flavascens, Gray. Densely white-tomentose, sometimes glabrate in age : leaves once 



or twice or even thrice pinnately parted ; the divisions or lobes from narrowly to rather 



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



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



short-campanulate throat almost equalled by the lobes : akenes rather short-villous : paleas 



of the pappus spatulate, usually only half the length of the slender corolla-tube. — PI. Fendl. 



97, & PI. Wright, i. lai, ii. 94 (excl. the last var.); Rothrock in Wheeler Exped. vi. 167, 



where one form is printed " Ii. canescens." H. robustus, Greene, Bull. Torr. Club, ix. 63, 



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, Pursh. Lightly tomentose, 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 

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

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

 DC. Prodr. v. 658; Torr. & Gray, 1. c. — Plains, from Nebraska to Arkansas, Texas, and 

 apparently also in Utah. 



4— -1— Stems clustered on a perennial caudex, leafy below, naked above, bearing feviLjir solitary 

 comparatively large heads. 



. fllifolius, Hook. Tomentose-cauescent, 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 : palea; of the pappus equalling or much shorter than 

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

 but the pappus is not " extremely minute." H. filifolius & H. luteus, Nutt. Trans. Am. Phil. 

 Soc. 1. c; Torr. & Gray, Fl. 1. c. //. 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 forms referable to U. 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. MexioanUS, 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 pinnately 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. 



— Proc. Am. Acad. xix. 29. II. flavescens, var.'? Gray, PI. Wright, ii. 94. — Mountain 

 ravines, New Mexico, Wright, Greene, Rusby. (Mountains near San Luis Potosi, Mexico, 

 these certainly perennial, Schaffner.) 



149. FLORESTiNA, 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. 



