POLYGONACEAE (BUCKWHEAT FAMILY) 151 



becoming 4 mm. long; the outer segments oblong; the inner longer and spatu- 

 late: achene glabrous. — Wyoming, Montana, and westward. 



21. Kriogonum multiceps Nees, Max. Reise N. A. 2: 446. 1841. Densely 

 white-tomentose perennial; the caudex short-branched, and more or less 

 tufted: leaves crowded below: scapes simple, slender, erect, 3-12 cm. high: 

 leaves spatulate or- oblanceolate, narrowed into petioles: involucres in a 

 terminal capitate cluster, with short spatulate foUaceous bracts: flowers white 

 or rose-color, somewhat villous, 3-5 mm. long; the segments cuneate, obtuse 

 or emarginate: stamens and style branches exserted. — ^Dry plains; Colotado to 

 Montana and east to Nebraska. 



22. Eriogonum pauciflorum Pursh, Fl. Am. Sept. 735. 1814. Densely 

 caespitose, at first more or less tomentose throughout: the narrowly linear- 

 oblanceolate leaves revolute and soon glabrous above, 4r-6 cm. long: the 

 turbinate involucres nearly glabrous, about 4 mm. long, in capitate clusters 

 at the ends of the peduncles; bracts ternate, minute: calyx campanulate, 

 white, glabrous; its segments ovate: achene glabrous, about 3 mm. long. — 

 Dry clayey ridges; Colorado to Montana. 



23. Eriogonum tenellum Torr. Ann. Lye. N. Y. 2: 241. 1828. Caudex 

 caespitosely branched, depressed and spreading, covered with the numerous 

 white-tomentose leaves: leaves oblong to elliptic, 6-15 mm. long, short- 

 petioled: scapes 1-2 dm. high, glabrous as is also the inflorescence, sparingly 

 paniculate-branched: flowers white or pinkish, becoming 3 mm. long: outer 

 sepals broadly ovate or orbicular; the inner linear pblong: achene 4-5 mm. 

 long. — Southern Colorado to Texas and New Mexico. 



24. EriogonumracemosiuuNutt.l.c. 161. 1847. Floccose-wooUy perennial; 

 scapes soUtary or few from the summit of the subterranean caudex, stout, 2-6 

 dm. high, naked or leafy-bracted at the lower nodes: leaves 3-6 cm. long, on 

 long (5-10 cm.) petioles, ovate or oblong, sometimes subcordate, white-woolly 

 beneath: involucres tubular-campanulate, obtusely 6-toothed, many-flowered, 

 appressed and strictly spicate along the few rigid subsimple branches: calyx 

 rather large (4 mm. long), pinkish or white, acute at base, very glabrous; its 

 segments obovate: ovary glabrous. — New Mexico through Colorado to Utah. 



25. Eriogonum Simpsonii Benth. in DC. Prodr. 14: 18. 1856. Subcaes- 

 pitose; the branches of the caudex few, short, leafy: leaves broadly linear, 

 5-10 cm. long, attenuate into a short petiole, greenish and thinly pilose above, 

 white-pilose beneath: peduncle 1-2 dm. long, dichotomously branching into 

 the broadly paniculate cyme: lower bracts .sometimes foUar, long-linear; the 

 upper subulate: involucres turbinate, glabrous, pubescent on the teeth within: 

 calyx white, glabrous, with broad obtuse lobes. [E. lonchophyllum T. & G. 

 Proc. Am. Acad. 8: 173. 1870; E. nudicaule (Torr.) Small, Bull. Torr. Bot. Club 

 33: 54. 1906; E. scoparium Small, 1. c. 54.] — ^In the arid districts; southern 

 Colorado and New Mexico. 



26. Eriogonum Jonesii Wats. Proc. Am. Acad. 21: 454. 1886. A woody- 

 based branched tomentose perennial, 3-8 dm. high: leaves alternate, ovate to 

 elliptic,' white-tomentose beneath, greener above; the blade 2-4 cm. long, 

 shorter than the petiole: bracts subtending the open dichotomous corymb 

 somewhat foliaceous: involucre mostly sessile and solitary, tomentose, scarcely 

 2 mm. long: calyx 2 mm. long, sUghtly exserted, glabrous, white or pinkish; 

 the inner sepals oblong; the outer obovate and emarginate. — ^Arid places in 

 western Colorado, through Utah to Arizona. 



27. Eriogonum salinum A. Nels. Bull. Torr. Bot. Club 31: 220. 1904. 

 Caudex woody, branched: stems herbaceous, strict, leafy up to the short 

 corymbose cyme, 1-2 dm. long: leaves narrowly lanceolate, mostly erect, sub- 

 succulent, short-petioled, 2-4 cm. long, white with a fine tomentum beneath, 

 glabrate but pale above: cyme mostly trichotomous; the bracts linear: in- 

 volucres turbinate, several-flowered, hghtly tomentose: calyx white; the inner 

 segments obovate, longer than the outer oblong-elhptic ones: stamens and 

 style branches included. — Saline districts; southern Wyoming. 



28. Eriogonum effusum Nutt. Journ. Acad. Phila. II. 1: 164. 1848. 

 Shrubby below and diffusely much branched from the base, densely but 



