ee atlantic i oe See a ST a 
THE YUCCEAE, 53 
and partly because of generalized earlier descriptions. One 
of the representatives of this group (probably true Y. fila- 
mentosa) was introduced into Europe about 1675, and 
Y. filamentosa was one of the four Yuccas known to Lin- 
naeus a century later, his description of it reading merely 
‘¢ foliis serrato-filamentosis,’’ and the only figure cited by 
him * being very unsatisfactory. 
That two species, Y. filamentosa and Y. flaccida, are 
separable, appears certain, as is also true of Engelmann’s 
conclusion f that the jilamentosa of Linnaeus was the 
form to which that name is here applied; but I have found 
it possible to fix only an approximate geographical range 
for either, and the garden forms are not separated as 
sharply as is desirable, nor so as to prevent some of them 
from obscuring the demarcation line between the species. 
It is not improbable that some of them represent hybrids 
between the latter. 
44, Leaves linear or linear-spatulate, white-margined. 
Y. tenuistyla Trelease. 
' Acaulescent. Leaves rather soft and mostly recurving, often a little 
scabrid on the back, about .5 m. long and 10 to 15 mm. wide, dark green, 
lanceolate, long-attenuate, scarcely pungent, white-margined, finely 
filiferous. Inflorescence about 1 m. high, panicled at some distance above 
the leaves, glabrous or slightly puberulent. Flowers with narrower, 
more pointed segments: style oblong, white, often deeply parted. Capsule 
stout, even: seeds glossy, 7 to 8 8 to 10 mm. — Plates 17, f. 2.18.19. 
83,f. 3. 
Southeastern Texas, from about Galveston (Lindheimer, 
May, 1843), to Sealy (Trelease, Harvey), and New 
Braunfels (Lindheimer, June, 1845), at the latter place 
associated with Y. Arkansana, which it closely resembles 
in foliage. — Plate 92, f. 1. 
Some of the Lindheimer material in the Engelmann her- 
* Morison, Plant. Hist. 2: 419. 
+ Trans. Acad. St. Louis. 33 52. 
