480 BOTAET. 



ate heads terminating the dichotomous or cymose-umhellate peduncles, the alar (or apparently lat- 

 eral) ones sessile ; hraotlets plumose. Shruhby, leafy ; leaves small, alternate and fascicled in the 

 axils, hoary beneath, usually revolute-margined ; flowers white or pinkish.— Coast of California, 

 mostly southern. 



35. E. CINBEETJM, Benth. 3-5° high, loosely branched, puberulent ; leaves orbicular to ovate, i-1' 

 long, undulate, short-petioled, but little fascicled ; flowers not very numerous, silky-villous ; peduncles 

 elongated, nearly naked, dichotomous ; heads few ; radicle slightly inflexed ; cotyledons oval. 



36. E. PAKVIFOLIUM, Sm. At first webby-wooUy ; leaves small, very numerous upon the branches, 

 ovate or ovate-lanceolate, undulate, with an abrupt or obtuse base ; peduncles di-trichotomous ; flowers 

 glabrous, very numerous, the involucres often subraoemose along the lengthened axis. 



37. E. FASCICULATUM, Beuth. Leaves numerous, oblong-linear or linear-spatulate, strongly revo- 

 lute; peduncles slender, naked, usually umbellately divided into 3-6 rays ; flowers glabrous or puberu- 

 lent, very numerous. — Variable. See page 302. 



5 10. COEYMBOSA, Benth. Involucres many-flowered, 5-6-toothed, cymose by the repeated umbel- 

 late and 3-3-chotomous subdivision of the summit of the naked peduncle, the pedicels short or 

 none ; calyx glabrous, 6-parted, the inner segments usually smaller, leaves mostly narrow and at 

 or near the base of the stems alternate, more or less white-woolly, not cordate. 



* Shrubs, or the stems sometimes short and but little woody ; calyx glabrous within, the segments 

 nearly alike ; ovary often scabrous above on the angles. 



(a.) Branches woody, erect or ascending, leafy, terminated by the cyme-bearing peduncle ; calyx 

 white or pink, rarely yellow, often a little thickened at base, lobes obovate, at least the inner ones 

 emarginate or retuse. 



38. E. EEiCiEFOLiUM, T. & Gr. Depressed, very much branched and very leafy ; leaves very numer- 

 ous on the branohlets, 2" long, subulate-linear and teretely revolute, glabrous above, white-woolly be- 

 neath ; cyme scarcely exceeding the leaves, of 3-7-crowded somewhat tomentose pentagonal involucres ; 

 calyx white, 1|" long. — Arizona. 



39. E. COEYMBOSUM, Benth. 1^-2° high, floccose-wooUy ; branches leafy; leaves oblong; cyme 

 broadly corymbose, many-flowered. See page 303. 



40. E. MiCEOTHECUM, Nutt. Low, rarely 1° high, much branched from the base, more or less floc- 

 cose-tomentose ; leaves oblong to linear ; cyme crowded or open. — Very variable. See page 303. 



{!).) Branches leafy, less woody, very short or cajspitose-depressed ; peduncle terminal, naked, elon- 

 gated, herbaceous, and with the 5-toothed involucre glabrous or glabrate ; calyx-segmouts nearly 

 equal ; leaves narrow, attenuate into a slender petiole. 



41. E. BEEVICAULE, Nutt. Low ; leaves much crowded on the caudex-like branches ; scapes rigid ; 

 flowers often yellow. See page 304. 



42. E. LONCHOPHYLLUM, T. & G. Taller and scarcely woody at the leafy base ; leaves not much 

 crowded, lanceolate or broad-linear, white-wooUy beneath ; cyme repeatedly trichotomous and panicle- 

 like ; lower bracts filiform, the upper subulate ; flowers white, with obovate retuse segments. — New 

 Mexico. 



* * Annual ; stems loosely branched, leafy only below ; calyx pink, glabrous within, the segments 

 obovate and nearly equal ; bractlets scarcely bearded. 



43. E. TKUNCATUM, T. & G. Loosely floocose-wooUy, 1° high ; leaves subfascicled, spatulate or ob- 

 long, li' long with the slender petiole ; peduncles long, naked; cyme loose, di-trichotomous ; involucres 

 rather few, many-flowered, 2" long, oblong-campanulate, truncate; bracts very small.— Mt. Diablo, 

 (Brewer.) 



* 'Annual, white- woolly ; stems tall, strict, leafy; cyme decompound, many-flowered; calyx 

 white, webbed within at base with long wool, the outer segments much the larger ; bractlets finely 

 plumose. 



44. E. ANWUDM, Nutt. Leaves oblong, attenuate at base, mostly petioled ; involucres woolly, glab- 

 rous within, shortly 5-toothed ; outer calyx-segments broadly obovate, the inner oblong.— From Nebraska 

 to Arkansas, Texas, New Mexico and Chihuahua. 



45. E. MULTIFLOEUM, Beuth. Leaves oblong and lanceolate, undulate, the cauliue sessile, obtuse or 

 auricled at base ; involucres 5-lobed, often glabrate, webbed within ; outer calyx-segments rounded oval, 

 becoming deeply cordate, the inner nearly linear.— Arkansas to Louisiana and Texas. 



5 11. VIRGATA, Benth. Involucres sessile along one side of the usually virgate branches of the pan- 

 icle, mostly small or narrow ; calyx 6-parted, usually glabrous. 



* Perennial, a few shrubby at base, woolly ; flowers white or pinkish, glabrous, many in the 

 involucre. 



