SYNOPSIS OF THE FLORA OF COLORADO. 121 



crowded upon the closely-branched caudex, oblong or sub-linear, mar- 

 gins re volute ; heads of 1-5 nearly sessile short 3-5- toothed involucres, 

 sessile among the uppermost leaves, sometimes shortly exsert-peduneu- 

 late in fruit ; flower with a broad sessile base, the calyx hardly 2" long, 

 tomeutose, 6-parted, with equal oblong segments ; filaments pilose only 

 at base ; ovary very tomentose with long tangled wool ; leaves 2"-3" 

 long, spreading from the imbricated sheathing base. Discovered by 

 Xuttall in the Rocky Mountains of Colorado; not seen by us. 



ERIOGONUM (LACHNOGYXA) LACHNOGYNUM, Torr. T. d; (7., 1. c., p. 

 163. Branches of the caudex very short and crowded; scape a span to 

 1 high, slender; leaves lanceolate or lance-oblong, 1' long, acute, 

 petioled, more or less revolutely-margined, silky above, tomeutose be- 

 neath ; calyx silky-woolly, yellow within. Southern Colorado and 

 Xew Mexico. Blufts of the Arkansas at Pueblo, Greene, 1873. 



ERIOGONUM (HETEROSEPALA) OVALIFOLIUM, Eutt. T. & ., 1. ., p. 



104. Perennial, ciespitose, acaulescent, hoary- woolly; leaves oval or 

 somewhat rounded, petioled, crowded upon the numerous short branches 

 of the caudex; scape 2'-8' high, simple, leafless, with a single head (very 

 rarely 2) of few (3-8) closely sessile 5-S-toothed involucres; bracts very 

 small or wanting ; calyx with the base not produced, very glabrous, 

 6-parted, more or less yellow or rose-colored, wholly petaloid, becoming 

 thin and scarious after flowering ; segments very unequal, the outer very 

 broadly oval, cordate at base with usually a rather deep sinus, the lobes 

 reaching to the joint or beyond it, the inm-r narrow, spatulate, ernar- 

 ginate, counivent-erect and involute, each bearing 3 stamens at the claw- 

 like base; ovary glabrous. Rocky Mountain's of Colorado to Utah and 

 Nevada. 



ERIOGOXUX MULTICEPS, Ker. T. & G., I c., p. 166. Clothed with very 

 white appressed wool ; branches of the caudex short, assurgent, leafy ; 

 leaves oblong-spatulate or oblanceolate, gradually attenuated into the 

 petiole ; scape 3'-5' high ; head bracteate ; bracts unequal, 1 or 2 of them 

 often surpassing the involucres ; flowers small ; involucres 5-10, tubu- 

 lose, 5-toothed ; calyx white or r brownish yellow, or tinged with red, 

 somewhat woolly ; segments obovate-cuueate, retuse ; filaments nearly 

 smooth. Southern Colorado, Brandegee. 



ERIOGOXUX PAUCIFLORUM, Piirsli. T. & G., I c., p. 166. Becoming 

 smooth, with the aspect of Armeria ; branches of the caudex very short, 

 crowded; leaves linear or subspatulate, re volute- margined, attenuated 

 into a petiole, at length nearly smooth; scape 4'-6' high, bearing a single 

 head; involucres 5-10, turbinate-campanulate, 5-toothed; calyx white, 

 glabrous, segments oval; filaments pubescent below. South Park, Canty; 

 Hoopes. 



ERIOGONUM MICROTHECUM, Xutt. T. if- ., I c., p. 170. Shrubby, rather 

 low, (rarely 1 high,) very much branched from the base ; tomentuin 

 floccose, sometimes rather thin; branches erect or assurgent, but the 

 cyme either crowded or effuse; leaves narrowly oblong and linear; flow- 

 ers white or rose-colored, rarely dull yellow, seldom over 1" in length, 

 usually rather thick at base after flowering, glabrous within, the seg- 

 ments obovate, inner ones at least emargiuate or retuse ; ovary often 

 scabrous above on the angles. 



Yar. FENDLERIANIDI, Beuth. Leaves broad, F-1J' long, "-Z" wide; 

 involucres 2" long, in an ample loose cyme. Canon City, Brandegee. 

 Pueblo, Greene. 



Yar. BFFUSUM, T. & G., (E. effusum, :N T utt, PL Garni}., 1. c., p. 172.) 



