192 COMPOSITE. (COMPOSITE family.) 



48. PEEICOME, 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-acumiuate, 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. — PI. 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- 

 nately 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 fi 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 seari 

 oils summit: leaves dissected or cleft, mostly 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 pubescence: 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., 



