340 COMPO/SITJE BALSAMOBBHIZA . 



WYETHIA 



3 EUBALSAMORRHIZA Nutt. 1. c. Lignles deciduous. Ach- 

 enes glabrous. Stems monocephalous . Leaves varying from 

 laciniately dentate to pinnatelyor bipinnately divided. 



B. terebinthacea Nutt. 1. c. 349. Slightly and minutely if at all can- 

 escent: stems several from the crown of the ralher small thick root, at 

 length 10-12 inches long and prostrate, usually with a pair of small opposite 

 linear leaves below the middle : leaves from green and glabrate to minutely 

 h'spidulous-scabrous, at length rigid and reticulate-veiny, oblong-lanceolate 

 with cuneate or truncate base, 4-8 inches long, spinulosely dentate or 

 some-times crenate-dentate or laciniate-incised or even pinnatifid : invo- 

 Jucre lanate-tomentose, about an inch high, of numerous narrow linear- 

 lanceolate and attenuate loose and nearly equal herbaceous bracts On 

 high stony ridges, eastern Washington and Oregon to Idaho. 



B. Hookeri Nutt. 1. c. Canescent with fine sericeous or more tomen- 

 tose pubescence, but not at all hirsute : stems 4 inches to at length a foot 

 long : leaves lanceolate or elongated-oblong in outline, pinnately or bipin- 

 nately parted into lanceolate or linear divisions, or lobes, or some of them 

 only pinnatifid or incised, nearly equalling the stems: involucre from 

 canescently puberulent to lanate; its bracts from linear- to oblong-lan- 

 ceolate, either unequal and well imbricated or some of the outermost 

 ones foliaceous and loose. On stony ridges, Washington to California 

 and Nevada. 



B. i lie ami Nutt. 1. c. 350. Densely white-tomentose throughout : stems 

 4-8 inches high: leaves oblong- or deltoid-lanceolate in outline, pinnately 

 c r bipinnately parted or lobed, the divisions oval or oblong : bracts of the 

 involucre lanceolate to linear, 8-10 lines long, imbricated in 2 or 3 series : 

 rays 12-14, more than an inch long: chaff of the receptacle much shorter 

 than the flowers. On high rocky ridges, eastern Washington to California 

 and the Rocky Mountains. 



B. hirsnta Nutt- 1. c. Roughish-hirsute or hispidulous, not tomentose 

 nor canescent : stems 10-16 inches high, with a pair of opposite leaves below 

 the middle : leaves lanceolate in outline, 4-8 inches long, short-petioled, 

 pinnately parted or divided, the divisions incisely toothed or again pinnat- 

 ifid, soon rigid: involucre 8-12 lines high, its bracts with ovate base and 

 long attenuate tip or linear-lanceolate, hirsute-ciliate. Dry plains British 

 Columbia to California, east of the Cascade Mountains. 



41 WYETHIA Nutt. Journ. Acad. Philad. vii, 30. 



Coarse perennial herbs with usually simple stems, alternate 

 mostly entire leaves and large heads of yellow flowers. Heads 

 many-flowered. Bracts of the campanulate involucre loosely im- 

 bricated in two or three series, nearly equal, foliaceous. the inner- 

 most smaller and resembling the chaff. Receptacle slightly con- 

 vex; the chaff lanceolate, carinate, acute, as long as the flowers 

 and embracing them. Rays large, pistillate, sometimes with ster- 

 ile filaments. Disk-corollas cylindrical, elongated, with a short 

 proper tube^ 5-toothed. Style-branches in the ray-flowers glab- 

 rous: in the disk elongated, filiform, revolute, strongly hispid on 

 the inner faces. Achenes stout, elongated, 4-5-angled, terminated 

 with a coroniform 5-10-toothed or laciniate pappus, one or more 

 of the teeth usually prolonged into a rigid persistent awn. 



v W. helianthoides Nutt. 1. c. Stems leafy, 6-18 inches high, simple and 



