498 COMPOSITAE 
longer than achenes, of 2-15 bristles, sometimes chaffy-dilated at base, alee ee with 
scarious scales, these rae eanee dissected into bristles. Anthers subentire at bas tyle- 
branches linear- clavate, e te. [Named for Wilhelm Friedrich Benedict Holes of 
Leipzig, eat 1877, batatical morphologis and physiologist. } 
Ag of about 6 species, of the southwestern United States and northwestern Mexico. Type species, 
A BR ee Bent h. 
1. Hofmeisteria pluriséta A. Gray. Arrow-leaf. Fig. 5873. 
fermaistere pluriseta A. Gray. in Torr. Pacif. R. Rep. 4: 97, pl. 9, 1857. 
; cosa A. Nels. Bot. Gaz. 37: 263 
Slender shrub, up to 80 cm. high wich tangled branches, ae pubescent, the bark white. 
Leaves opposite below, ‘ibvhale above ; oe 2-6 cm. lon ; blades lanceolate to ovate, acute, 
0m h fe 
entire or usually sharply toothed, 2- long ; eads nt in pedunculate cymes or cymose 
panicles, rarely solitary, about 9 m se high Hie glandular-puberulous, the phyllaries dry, 
often purplis h-tinged, striate, at least the r with acute to acuminate, mucronate, spreading, 
herbaceous tips ; corolla white ; aaa ae, hispidulous ; pappus of about 12 slender bristles, 
sometimes paleaceous-dilated t foward base, alternating with about as many shorter bristles or 
Hnear-atent ate scarious squamellae 
n desert places, Lower Sonoran ee arene. and Utah to Arizona, southeastern California, and Lower 
Calloraie. Type locality : Bill Williams Fork, Ari . Oct.-May 
133. EUPATORIUM L. Sp. Pl. 836. 1753. 
s or shrubs of varied habit. Leaves usually opposite at least tes commonly 
1 
petioled and toothed. Heads discoid, many-flowered, never yellow. Involucre 2- —many-~ 
seriate, equal or gradu as or usually dryish phyllaries. 3 oes cle flat or sapioeoe nak 
Corollas all sobiler: 5-toot chenes usually cylindric, 5-ribbed. Pappus of nume rous, 
l-seriate, rigid, capillary eines Stamens entire at base. Style-branches elongate, blunt, 
bas clavellate. [Named after Eupator Mithridates, King of Pontus, who is said to have 
the plant in medicine. } 
a very large genus of at least 500 species, chiefly of the —- bbe boi Besides the following, numer- 
ous species occur in the Untied States. Type species, Eupatorium bi 
Plants not conspicuously if 11 ; heads 8-16-flowered, the achenes glandular or sata Si: 
Leave: s chiefly eee: fowers crimson to pink. . E. occidentale. 
Leaves opposite; flowers white. : E. herbaceum. 
Plants conspicuously glandular; heads 20—30-flowered, th h glab 3. E. adenophorum. 
1. Eupatorium occidentale Hook. Western Eupatorium. Fig. 5874. 
Eupatorium occidentale Hook. Fl. Bor. Amer. 1: 305. 1833. 
Kyrstenia occidentalis Greene, Leaflets Bot. Obs. 1:9. 1903. 
Many- ce oa perennial from a woody 25-80 cm. — the nee re finely in- 
curved-puberulous. Leaves chiefly alternate; petiole s 3-15 mm ; blades ovate, 1.8-6 cm. long 
usually acute, at ase € : 
slightly puberulous beneath ; heads Bf flowered, about 8 mm. high, cr owded in small cymose 
panicles terminating stem and branches; involucre 2-seriate, grey 3-4 mm. high, the phyllaries 
linear, acute or acuminate, puberulous ; corollas crimson, pale purple or white ; achenes 3 mm. long, 
sessile-glan dular. 
cam bank and among rocks, Transition and Canadian Zones; Idaho to Utah, western Nevada_and 
Was shington 20 south . the mountains of northern Calituriits and in the Sierra Nevada to Tulare County. Type 
ete. “On the low hills between the north and south branch of Lewis and Clarke’s River,’’ northern Idaho. 
2. Eupatorium herbaceum (A. eked, Greene. Desert Eupatorium. 
Fig. 587 
? herbaceum A. Gray, ae Contr. 5°: 74. 1853. 
Eupator ncciidentals var. arizonicum A. Gray, Syn. Fl. N. Amer. 12: 101. 1884. 
Enpetorivs herbaceum Greene, a atl 1901 
Eupatorium arizonicum Greene, ai 
Opposite-leaved perene, ial, we dm. high, from a woody root, herbaceous or somewhat suf- 
frutescent at base, the pee ¢ minutely scaberulous, especially on the upper part. Leaves glabrous 
or somewhat poets neath, 1-4.5 cm. long, the petiole 4-11 mm. long, the blade rather firm, 
veins cereatnieat on older leaves, deltoid to -g hdelggat- ves acute at apex, truncate or subcordate at 
, the margin crenate om at the de inflorescence of short-pedunculate d Aghary 
terminal or terminating the upper branchlets "heeds -16-flowered, white, about 5 m igh, 
the peduncles es aenichy caberulous ; phyllaries Bd Lip ual in length, ‘coeiaiete: more 
or less — 3.5-4 mm. lo sped ewes, hispidu lou the Be 
Canyon wana a asi on desert mountains, Upper Sa: moran Zone; Colorado and Utah south to New 
Me fe ar Ppt ede aad tee the New York haniiatns ahowg 28 and Clark Mountain : tee s), San Bernardino County, 
California. Type locality: Santa Cruz, Sonora. Collecte y Wright. June— 
