The characters commonly used in separating S. porri- 
Jolia from S. Romanzoffiana may be summed up as fol- 
lows: 1) S. porrifolia, calli of the lip rather prominent ; 
lip essentially ovate-lanceolate in outline, usually oblong- 
quadrate below the constriction, scarcely (if at all) dilated 
at the apex and usually only cellular-papillose on the 
apical margin. 2) S. Romanzoffiana, calli minute; lip 
panduriform, orbicular below the constriction, strongly 
dilated at the apex and usually lacerate on the apical 
margin. 
Intergrading forms between these two entities may be 
found. Often a lip in other respects like that of typical 
S. Romanzoffiana will possess large, fleshy calli compara- 
ble to those which occur normally in S. porrifolia. Con- 
versely, a lip like that of 8. porrifolia will possess the 
characteristic minute or almost obsolescent calli which 
characterize S. Romanzoffiana. The inflorescence of typi- 
cal S. porrifolia is composed of several ranks of flowers 
and is characteristically more slender than that of S. 
Romanzoffiana. Several collections of S. porrifolia have 
been seen whose flowers are disposed in a single, secund 
or spiral rank. However, this occurrence is rare. 
We consider the localized S. porrifolia to be a geo- 
- graphic variety of the widespread and fairly common S. 
Romanzoffiana, and it will be so treated in our work on 
the Orchidaceae of North America, north of Mexico. 
Variety porrifolia is at present known to occur in Cali- 
fornia, where it is rather abundant, and in Utah, Nevada, 
Washington and Oregon, where it is less common. 
Epidendrum Howardii Ames & Correll sp. nov. 
Herba elata. Pseudobulbus ovoideus, ad apicem bifoli- 
atum sensim angustatus, vaginis magnis scariosis sufful- 
tus. Folia suberecta, lineari-ligulata, ad apicem obtusum 
leviter angustata, coriacea. Pedunculus terminalis, ro- 
[2] 
