572 POLYGONAOEiS". ekiogondm 



. 'slender dcflexed pedicels an inch long or less, .5-cleft to near the middle: 

 flowers whitish, campanulate, half a line long, fiddle-shape. On dry plains, 

 eastern Oregon to Nebraska and New Mexico. 



* * Annuals, branching from the base, with leaves developed at 

 the nodes in tbe ^xils of ordinary triangular bracts: flowers miautely 

 glandular. 



E. angulosum Benth,. Trans. Linn. Soc. xvii, 406, t. 18. Floccose- 

 wooUy, or at length glabrate: stem erect, 4-12. inches high, leafy, branch- 

 ing into a repeatedly di-or trichotomous panicle ; the branches acutely 4-6 

 angled : radical leaves spatulate or rounded, the cauline oblong-linear to 

 lanceolate : pedicels 6-12 lines long, widely spreading : involucres short- 

 campanulate or hemispherical, minutely glandular or almost smooth, soli- 

 tary, many-flowered, 5- toothed becoming dilated in fruit : flowers very obtuse 

 at base, a line, long, on short pedicels, rose-color or white, deeply 5-paried, 

 the outer segments ovate, the inner at length longer, lanceolate-oblong. 

 Eastern Oregon to California and Utah. 



* * * Tall stout white-tomentose annuals, with leafy simple stemsj 

 naked above: inflorescence cymoae: involucres turbinate campanulate, 

 shortly pedicelled : flowers white, nearly' glabrous : eepals very unequal. 



E. auunnm Nutt. Trans. Am. Phil. Soc. Ser. 2. v, 164. Flowers 

 tomentose throughout: stem 1-3 feet high, leafy below: leaves oblong-lanc- 

 eolale or oblanceolate, narrowed at base to a petiole, the margins somewhat 

 revoluteor crisped : involucres turbinate 1-1.)^ lines long secund, erect, 5 

 toothed : calyx j^-1 line long, the segments obovate. On dry plains Idaho 

 to Nebraska and Texas. , . ; n 



§ 3 Involucres cylindric-turbinate, mere or less strongly 5-6 

 nerved, often becoming, costate or angled, with as many short 

 erect teeth, mostly sessile in heads or clusters, scattered in cymes 

 or along virgate panicled branches, always erect, 1-3 lines long: 

 bracts ternate, connate at base, iisually short, acute and more or 

 less rigid : flowers not attenuate at base : achenes usually glabrous. 



* Cespitose densely tomentose perennials, with shqrt closely laranph- 

 ed caudex: involucres a single head or short cympse umbel on the 

 naked peduncle : outer sepals broad and somewhat cordate, the inner 

 much narrower: ovary scabrous above. 



E. ovalifolium Nutt. Journ. Philad. Acad, vii, 50, t. 8. Densely 

 white-tomentose and silvery : stems very short and deprcssed-cespitose, 

 pe.-ennial ; leaves broadly oval or oblong, the blade 3-10 lines long, acutish, 

 abruptly narrowed to a long slender petiole, crowded upon the numerous 

 short branches : scapes 3p9 inches high simple, naked, bearing a single head 

 of 3-8 closely sesfile q-8 toothed involucres: calyx very glabrous, yellow or 

 rose-color, becoming thin and scarious, after flowering, the segments verp- 

 unequal, the outer very broadly oval, cordate at base : the inner spatulate, 

 emarginate. On dry hillsides, easterUiBrit. Columbia to California and 

 the Rocky Mountains. 



Var. prolifernin Watson Proc. Am. Acad, xii, 63. Larger than the 

 type, the involucres loosely cymose-umbellate. With the type'. 



E. vinenin. Small Bull. Torr. Bot. Club xxv, 45. Closely white-tomen- 

 tose up to the inflorescence : perennial from a stout tap-root : stems branch- 

 ing, the branches tufted, clothed wiih-the persistent leaf bases: leaves 

 crowded, the blades suborbicular or broadly oVal, 3-5 lines long obtuse or 

 rounded at the apex, abruptly narrowed or truncate at base : on petiol es 

 often as long as the blade : scapes erect, 1-4 inches lohgi simple : involucres 



