OF ARTS AND SCIENCES. 255 



•^ -t- Akenes not winged : flowers attenuate at base, enlarging in fruit. — 

 (sp. of § Eriantha, Bentli., Torr. & Gray.) 



4. E. LONGiFOLiUM, Nutt. Hoary-pubescent throughout and the 

 leaves tomentose beneath : involucres and flowers densely white-silky : 

 Hewers mostly herbaceous, 1 h becoming 2 or 3 lines long : akene 2 

 lines long, pubescent above. — Indian Territory and Texas ; Florida. 



* * Tomentose perennials, with radical leaves, and naked scapelike stem, di- or 



trichotomous above, with large conspicuous bracts : involucres solitary, ses- 

 sile, with 6 erect teeth : flowers attenuate to a stipelike base, pubescent, en- 

 larging in fruit : akene mostly smaller : embryo straight and axile, or nearly 

 so. — (§ Eriantha, Benth., Torr. & Gray, excl. sp.) 



5. E. TOMENTOSUM, Michx. Tall, herbaceous, rufous-tomentose : 

 radical leaves elongated, oblanceolate-spatulate ; bracts elliptical, ses- 

 sile, smooth above undulate: flowers white, tomentose, 2 lines becoming 

 4 or 5 lines long, the inner sepals largest: akene 2| lines long. — S. 

 Carolina to Florida. 



6. E. UNDULATUM, Benth. A little-known Mexican species, 

 described as low and cespitose, woody, much branched and leafy : 

 leaves and bracts ovate, petioled, with revolute undulate margins : 

 flowers much smaller. 



7. E. Jamesii, Benth. Eather slender, herbaceous, with branch- 

 ing eaudex, a foot high or less, wdiite-tomentose : leaves and bracts 

 oblong-oblanceolate, the latter shortly petiolate : flowers whitish, 

 silky, 2 becoming 3 or more lines long : akene 2 lines long. — Var. 

 FLAVESCENS. Stouter ; flowers yellow or yellowish. £. Jlavi(m,va.r. 

 veyetius, Torr. & Gray. Rev. 156. — Colorado to New Mexico and 

 W. Arizona. The variety is distinguished from the next by the strictly 

 solitary sessile involucres. 



* * * Perennials, more or less tomentose or rarely glabrous, with peduncles 



naked and scapelike or verticillate-bracteate in the middle : bracts mostly 

 conspicuous : involucres 5-8-toothed or -cleft, in a simple or compound um- 

 bel (rarely sub-capitate) or solitary : flowers mostly attenuate to a stipelike 

 base: akenes glabrous or nearly so (2 lines long or less) : embryo mostly 

 somewhat curved and excentric (as in the rest of the genus). — (§ Umbellata, 

 Benth., in part. §§ Umbellata & Pseudo-Umbellata, Torr. & Gray.) 



■I- Teeth of involucre short, erect or nearly so. 

 t-f Umbel simple (compound in n. 13), on a naked peduncle. 

 = Flowers villous. 



8. E. FLAVUM, Nutt. Tomentose throughout, a span high or less ; 

 eaudex branching : leaves oblanceolate : umbel of 3 to 9 rays, often 

 short : flowers yellow, 2 or 3 lines long, long-attenuate at base, very 



