

) 



1909] NELSON— PLANTAE GOODDINGIANAE 433 



The species for which this new genus is proposed were most of them described 

 under Encelia, but have in more recent years been transferred to Helianthella, 

 and sometimes back again. This of course indicates that they do not conform 

 to either genus, and since the five species constitute a very homogenous and charac- 

 teristic group it seems far better to give them generic rank. E. nudicaulis, though 

 not the oldest of the species, was the first to be correctly and completely delineated, 

 and may be cited, therefore, as the type of the genus. Mr. Marcus E. Jones 

 has well called attention to the fact that these are singularly out of place in Helian- 

 thella so far as habitat is concerned. The true species of that genus belong in 

 the mountains, mostly in cold moist situations in high altitudes; while Enceliopsis 

 occurs only in absolutely the hottest, driest area to be found on this continent. 



Enceliopsis nudicaulis, n. comb.— Encelia (§ Geraea) nudicau- 

 lis Gray, Proc. Am. Acad. 8:656. 1873; Helianthella nudicaul' 

 Gray, Proc. Am. Acad. 19:9. 1883; Encelia nudicaulis Jones, Pro 



5 



Calif. Acad. Sci. II. 5-7 01 - l8 95- 



Enceliopsis argophylla, n. comb.— Tithonia argophylla Wats., 



Bot. King's Rep. 5:423. 1871; E. argophylla and H. argophylla 

 Gray, in turn, as above; not H. argophylla Coville, Contrib. U. S. 

 Nat. Herb. 4:132. 1893; E. argophylla Jones, I. c. 702. 



Enceliopsis grandiflora, n. comb.— H. argophylla Coville, Contrib. 

 U. S. Nat. Herb. 4:132. 1893; E. grandiflora Jones, I. c. 702; H. 



Covillei A. Nels., Box. Gazette 37:273. 1904. 



Enceliopsis nutans, n. comb.— E. nutans Eastwood, Zoe 2 : 230. 

 1891; Verbesina sea posa Jones, Zoe 2:248. 1901. 



Enceliopsis tuta, n. sp.— The large woody root crowned with a 

 widely and freely branching caudex; the branches thick, 2-io cm 

 long, protected from desiccation by a thick felted sheath of white 

 wool: leaves all on the crowns, densely and minutely appressed- 

 cinerous or silvery white, rather small, i 5 -25 mm long, narrowly to 

 broadly elliptic-ovate, mostly cuneately subacute at both ends; the 

 barely margined petiole usually much longer than the blade: scape 

 rather slender, i 5 - 3 o cm long: involucre hemispherical, 20-25-™ 

 broad, its pubescence similar to that of the leaves but longer; 



mvo- 



9-1 1 mm 



long, the inner a little longer: rays puberulent, as in the other species, 



20-2 



apex: chaffy bracts of the receptacle equaling the disk-flowers: 

 achenes softly hoary-villous, the dark body (when wet) in hne contrast 



