481 
(a.) Calyx broad aud truncate below, liaviug the broad-oval outer segments diatinct and subauricu- 
late-rounded at base ; panicle often dichotomous and bracts somewhat leafy ; wliite-woolly. 
46. E. NiVEUM, Dougl. Woody at base, 1° bigb or more, densely tomentoae ; stems leafy below or 
nearly naked ; leaves ovate or oblong, petioled ; tbe bracts and the 3-4 subulate teeth of the densely 
woolly involucre recurved-spreading; outer calyx-sogments becoming rounded-oval and slightly cordate, 
enclosing the obovate-spatulate inner ones. — Oregon and Washington Territory. 
47. E. BiCHOTOMUM, Dougl. Somewhat like the last ; branches short and densely leafy, with strict 
scape-like rarely leafy peduncles ; leaves oblong, attenuate at base ; bracts appresscd, shorter th:iii llie 
Involucre; involucre-teeth 3-5, shortish and obtuse, subequal ; outer calyx-segments obovate-m 
Oregon and S. Idaho. 
(&.) Calyx acute at base, the segments alike ; the first two species scapose and strict, tlie last caul- 
escent and diffusely paniclcd. 
48. E. STitiCTUM, Benth. Cffispitosely much-branched at base ; le;iA vs < ro\s ded, spatulato or obovate- 
oblong, white-woolly beneath, attenuate into a long petiole ; scapes v. r\ slender, 1" high, glabrous or 
glabrate, 2-3-chotomou8ly branched; bracts small, subulate, ni)iinss((l ; invdiucre I" long, glalmite, 
campanulatc, equally 5-tootbed; calyx-segments oviil or oblong.— Oivuoii. (l).>iii;!as.) 
49. E. KACEMOSUM, Nutt. Leaves ovate or oblong, loug-petioled, ulunpl or suiu'OKlntc al Icise; 
scape stout, 1-2° high ; involucres spicate along the few rigid hrunclit's. Scf pagi; 301. 
50. E. Wrightu, Torr. Branched from a shrubby base, lialy below: leaves narrow at base, often 
fascicled ; involucres loosely spicate ; ovary .slightly scabrous above. Hee pa^t; 305. 
* Annual, (excepting perhaps E. eJoiigatum ;) ilowers email, wliile or rose-color, aeiiit ui .k-ii! i-h 
at base, mostly glabrous ; bracts small, appressed. 
(«.) Involucre tubular, 3i-2" long, many-dowered, hoary-woolly, sciirtered ni.on the virg;i(e mostly 
simple branches, appressed; calyx-segments obovate. nearly e(inul. W'liite- woolly jilant^, (lie 
at length floccose tomentum rarely deciduous. CalilWinian. 
51. E. ELONGATL'M, Benth. Stems or branches higli, sparingly leafy at l)ase mily ; leaves 
oblong-lanceolate; involucres 3" long, rather mauy-llowercd, spicate and distant along the simple 
branches, repand-truncate ; ovary glabrous ; embryo 1" long or more. 
52. E. ^ IRGATU.M, Benth. Stem more slender, sparingly loaly at the base or also above ; branche-s 
few, simple, sometimes paniculately branched ; leaves ovate or oblong ; involucres 2-2i" long, 5-toothcd ; 
ovary and abruptly rostrate achenium a little scabrous above; embryo i" long. 
(t.) Involucre narrow-tubular, few to rather many-flowered, 2" long or less, scatiere.l on the slender 
branchlets of the diffuse panicle, longer than the glabrous or pilose flowers: liia. tbts -earcely 
bearded ; low, finely tomentose above or glabrous, with rounded radical leaves. 
53. E. DASYANTHEMUM, T. & G. Cincreous-woolly or glabrate abovc ; involucre shortly S-toothcd, 
commonly hoary, fully 2" long, sometimes 15-20-flowenHl : calyx finely villous, at b ast at ba.e. tin- obo- 
vate segments nearly equal.— California. 
54. E. VIMINEUM, Dougl. Involucres few-tiowored and glabrous, as also the very slen.ler branehos 
of the more decompound panicle ; calyx glabrous, inner segments narrower. See ]»age :m. 
(c.) Involucre few or rather many-flowered, oblong-campanulate. snbtu. lmKife. .Vruorln <1, I ' long, 
scattered upon the slender branchlets of tlie usually mn. li-bnui. bed ].an-. ! • :'.io„.. 
shorter than the involucre, inner segments iir,ii..w ; leaves ladieal or more 
woolly beneath, floccose-woolly above, as usually tbe b.anebes an.l nivoln. n >. 
55. E. GEACILE, Benth. Stem naked or leafy ; pani. ie op'>" ^nid sii.ea<!in,i; : bj .a i b . ^ M.l.p^landular- 
barbellate ; outer calyx-segments obovate, the inner oblong. See page 
56. E. POLYCLADON, Beuth. Wool persistent : stem -J^li bi.t;b. le.dy lo ibe i..ll. r -l.,et anq.b- pan- 
icle; leaves oblong and obovate ; bractlets villous with v. ry bmg <lelieate l,au> : . aiyx-seg.nent> atten- 
uate at base, the outer fan-shaped, the inner obovate-spatulate.-W . iexas to An/oua. 
(d) Involucre mostly short-campanulate, small, shorter than the enlarged e;,.i n>e 
usually tangled branchlets of the naked ].anie]e, i!s teetb l-n. broad, roun.b ,, . - • 
leaves subradioal, rounded, long-pi tioie.i. 
57. E. IlKF.nMAXXi, Dur. & Hilg. Glabrous or glabrai- : calyx ^h.hr.,u<. •.. <•„»....- 'l b-ng. '•"«' ' 
secments rounded, the inner smaller, obb>ni:- ' '' ' ^ . i . 
58. E. PLUMATKLLA, Dur. & llilg. 1 ^' 
obovate-cuneiform, retuae. See page 30(3. 
59. E. IXTRICATUM, Benth. Leaves vi.sei.l-p.i-e^* e„i : lb- divaneateiy nn.e!,-branei. 
the very small few-flowcrod short-campaualate involucres -labrous; bractlets obo^ab - 
Gl 
