SYNOPSIS OF THE FLORA OF COLORADO. 83 



SENECIO BIGELOVII, Gr. in Bot. Whippl. Exped., Pacif. R. R. Surv., 4, 

 p. 111. Glabrous; stem simple, stout, erect, 18'-2, from a perennial 

 root, racemose at the summit, bearing 3-15 heads ; leaves ovate-lan- 

 ceolate, acuminate, sharply callous-dentate, contracted into a large mar- 

 gined petiole; uppermost lanceolate, narrowed at the base, partly clasp- 

 ing ; heads large, nodding, homogamous ; involucre broadly cainpanu- 

 late, with a few short setaceous bracteoles at base; scales 10-12, acute, 

 equal, outer ones lanceolate, inner ones broader, scarious-margined j 

 rays none ; achenia very glabrous. 



Yar. HALLII, Gr. Proc. AcacL Phil., March, 1863, p. 67. Note. Leaves 

 almost all lanceolate, more or less woolly pubescent, hairs articulated j 

 cauline leaves all sessile or the lowest contracted into a winged petiole. 

 Hall ' ( Harbour ,321. Canby. Canon City, Brandegee. Mount El bert 

 and Sierra Madre Range, Coulter. 



SENECIO AMPLECTENS, Gr. /. c. Slightly woolly, becoming glabrate; 

 stem G'-lo' high from a perennial root, naked at the apex, bearing 1-3 

 heads ; leaves membranaceous, oblong or lingulate, either repand or 

 very sharply-toothed or even sub-laciniate, lowest narrowed at the base 

 or attenuated into a winged petiole, upper sessile, half-clasping by a 

 broad base ; heads upon long, slender peduncles, nodding ; involucre 

 loosely ealyculate; rays linear, elongated, l'-2' long, golden -y ello w ; 

 achenia very smooth. Hall & Harbour, 317. Canby. Gray's Peak, Dr. 

 Smith ; Meehan. White House Mountain, at 13,000 feet altitude, La 

 Plata Mountain, at 12,000 feet, and Horse Shoe Mountain, at 11,000 feet, 

 Coulter. 



Tar. TARAXACOIDES, Gr. I. c. Truly alpine; 2 / -5 / high, bearing a single 

 head ; head smaller, less nodding ; rays less than V long ; leaves all 

 attenuated at base, more or less laciniate. Summit of Pike's Peak, 

 Canby. Sange de Cristo Pass, Brandegee. 



SENECIO* SOLDANELL A, Gr. Proc. Am. Acad., March, 1863, p. 67. Note. 

 Subcaulescent, '-5' high; very smooth, sub-glaucous; stems bearing a 

 single head, rarely more; root fasciculate- fibrous ; leaves thick, purple- 

 tinged beneath, radical and lowest orbiculate, occasionally somewhat 

 renitbrm, contracted at the 3-nerved base into a long or very long flat 

 petiole, often somewhat denticulate, l'-2' in diameter, upper ones 1-3, 

 smaller, oblong or spatulate, on short dilated petioles; heads large, some- 

 what nodding, 8 // -12 // broad and about as long; scales of the involucre 

 lanceolate, with scarious margins, 16-20, with 7-9 of the outer ones nar- 

 rower, and without margins, looser and either a little or one-half shorter; 

 rays oblong, 16-18, yellow, about 4" long, scarely surpassing the disk ; 

 achenia very glabrous. Hall & Harbour, 319. "High alpine, among 

 rocks." Sangre de Cristo Pass, Brandegee. Mount La Plata, at 14,000 feet 

 altitude, and White House Mountain, at 13,000 feet, Coulter. 



SENECIO RENIFOLIUS, Porter, (n. sp.) Very smooth ; stems, as well as 

 the petioles and under surfaces of the leaves, bright purple, numerous, 

 ascending from a long, slender, creeping purple root-stock, l'-2' high; 

 leaves clustered at the base, all reniform, crenate, or crenate-lobed, 4"- 

 6" long, on flattened petioles of the same length, dark green above ; up- 

 per leaves 1-2, spatulate, crenate, sessile ; peduncle somewhat elongated, 

 bearing a single erect head, about 4 // -6 // long, 4 // -5 // broad ; scales of 

 the involucre rather shorter than the disk, nearly equal, 4" long, lance- 

 olate and linear- lanceolate, purple, inner ones with slightly scarious 

 margins; calyculate scales few, minute, subulate; rays oblong, about 

 4" in length; bright yellow; achenia glabrous. High alpine. White 

 House Mountain, at 13,000 feet altitude, Coulter. 



