192 COMPOSITE, (composite family.) 



48. PERICOME, Gray. 



The name refers to the coma of long hairs all round the margin of the 

 akenes. 



1. P. caudata, Gray. Rather tall, widely branching, strong-scented, very 

 minutely puberulent: leaves opposite, long-petioled, green and minutely some- 

 what resinous-atomiferous, triangular-hastate, 2 to 5 inches long, with sparingly 

 crenate-dentate or entire margins, caudately long-acuminate, as also in less 

 degree are the basal angles : heads numerous in terminal corymbiform cymes, 

 half-inch or less high ; flowers golden yellow, conspicuously longer than the 

 glabrous involucre: pappus a crown of hyaline scales which are more or less 

 connate and fimbriate-lacerate at summit, the fringe dissected into bristles or 

 hairs somewhat simulating those of the margin of the akene. — PL Wright, ii. 

 82. Rocky canons, etc., S. Colorado, New Mexico, and Arizona. 



49. ERIOPHYLLUM, Lag. 



Mostly floccose herbs : with alternate or partly opposite leaves, and pedun- 

 cled heads : flowers golden yellow. In ours the heads are mostly solitary or 

 scattered and conspicuously pedunculate. 



1. E. CSespitOSUm, Dougl. Floccosely white-woolly, many-stemmed 

 from the root : leaves in age with upper face often glabrate ; lower ones from 

 spatulate or cuneate to roundish in outline, from incisely 3 to 5-lobed to pin- 

 uately parted, or the upper varying to linear and entire : involucral bracts 8 

 to 12, oblong or oval: tube of disk-corollas mostly hirsute-glandular and 

 longer than the pappus, which is variable, sometimes very short, sometimes 

 obsolete. — Bahia lanata, DC. Common from Montana to British Columbia 

 and thence southward. Very variable, one form within our range being 



Var. integrifolium, Gray. Low, often dwarf, cespitose-tufted, 3 to 10 

 inches high : leaves from narrowly spatulate or oblanceolate and entire to 

 more dilated and 3-lobed at summit, or at base and on sterile shoots cuneate 

 and incisely lobed : involucre of 6 bracts : pappus about equalling the very 

 glandular but not hirsute corolla-tube. — Proc. Am. Acad. xix. 25. Bahia 

 integrifolia, DC. Mountains of Wyoming, Montana, and westward. 



50. BAHIA, Lag. 



Sometimes canescent but not woolly : with opposite or sometimes alternate 

 leaves, and rather small pedunculate heads of yellow flowers terminating the 

 branches 



* Scales of the pappus 4 to 8, obovate or spatulate, with rounded or truncate scari- 

 ous smnmit: leaves dissected or cleft, nwsthj opposite. 



1. B. oppositifolia, Nutt. A span or two high, fastigiately branched 

 and many-stemmed, very leafy up to the short-peduncled heads, cinereous with 

 fine close pul)escence : leaves petioled, palmately or pedately 3 to 5-parted 

 into linear divisions little broader than the margined petiole : bracts of the 

 involucre oblong or oval, comparatively close : rays .5 or 6, oval, hardly sur- 

 passing the disk-flowers : akenes slender, glandular : pappus half the length 

 of the corolla-tube. — Sterile hills and plains, Nebraska to Colorado and New 

 Mexico.. 



