512 
turbinate involucre about 4 lines high, the multiserial closely in- 
bricated bracts scarcely glandular, firm and chartaceous, with con- 
spicuous short and appressed green tips ; purple rays narrow and 
numerous, % inch long. 
Sandy fields of the Mesilla Valley, New Mexico, flowering in 
autumn. A distinct and beautiful species. 
GAILLARDIA MULTICEPS. 
Less than a foot high, the numerous very leafy stems from 
an apparenty suffrutescent base, whitish and merely puberulent ; 
the numerous leaves also puberulent, rather fleshy and deeply im- 
pressed-punctate, the lowest narrowly oblanceolate, obtuse, the 
others linear, all entire, mostly 2 or 3 inches long; peduncles 
short, slender ; bracts of the involucre ovate, caudate-acuminate ; 
rays yellow ; teeth of the disk-corolla short and obtuse; ovaries 
very villous at base, more delicately pubescent above ; pappus of 
elongated lanceolate paleae, and a short awn, but this quite sur- 
passing the disk-corolla. 
_ South of Woodruff, Arizona. A member of the group to 
which belong G. spathulata and G. Parrvi (é. ¢., G. acaults, 
Gray, not Pursh). 
The North American Species of Porella. 
By MARSHALL A. Howe. 
The name Porella first appears in the Historia Muscorum of Dil- 
lenius,* where it is applied to a genus of ‘‘ Musci”’ from Pennsyl- 
vania, falling in his arrangement between Lycopodium and Selagt- 
noides. In the generic characterization, the plant is described as 
bearing naked ‘“antheraceous” capsules, without operculum of 
pedicel, dehiscing by several pores through the sides, and emitting 
a farinaceous powder. Following this is a diagnosis of the only 
species known to Dillenius, which we quote in the original, inas- 
much as there is an opportunity for differences of opinion as to— 
the exact translation in one or two particulars, His words are: 
“* Cut rami alterni, folia in nervo vigidiusculo alternatim opposita, . 
* Historia Muscorum, 459. f/. 68. 1741. 
