840 ‘COMPOSITAE BALSAMORRHIZA 
. WYETHIA 
§ 8 EupatsAmorruizA Nutt. 1c. Ligules deciduous. Ach- 
enes glabrous. Stems monocephalous. Leavés 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 rather 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 Uregon 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: leayes 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. inecana Nutt. 1. c. 350. Densely white-tomentose throughout: stems 
4-8 inches high: leaves oblong- or deltoid-lanceolate in outline, pinnately 
cr 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. hirsuta 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. yii, 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. 
. W. helianthoides Nutt.1.c. Stems leafy, 6-18 inches high, simple and . 
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