116 MISSOURI BOTANICAL GARDEN. 
Y. < Elmensis Sprenger, Lists 1, 2. (¥. jfilamentosa major 9 xX Y. 
gloriosa). 
Y. X Guiglielmi Sprenger, Lists 1, 2. (Y. filamentosa 29 X YF. 
gloriosa). 
Y. X Imperator Sprenger, Lists 1, 2. (Y¥. filamentosa major 2 x Y. 
gloriosa glauca pendula). 
Y. X liliacea Sprenger, Lists 1, 2. (Y. filamentosa 9 XK “ Y. rupes- 
tris’? [rupicola] ). 
Y. X magnifica, Sprenger, Lists 1,2. (Y. flaccida 2 X Y. gloriosa). 
Y. X margaritacea Sprenger, Lists 1, 2. (¥. jfilamentosa and Y. 
gloriosa). 
Y. < praecox Sprenger, Lists 1,2. (Y. filamentosa and Y. gloriosa). 
Y. * Treleasii Sprenger, Lists 1, 2. 
Y. < viridifiora Sprenger, Lists 1, 2. 
Y. X Vomerensis Sprenger, Lists 1,2. (Y. aloifolia 9 X& Y. gloriosa). 
SAMUELA Trelease. 
Perianth openly campanulate, salver- or funnel-form, of thin broadly 
lanceolate segments the narrowed bases of which are connate into a 
distinct conical or cylindrical tube. Filaments thick, inserted in the 
throat, outcurved above; anthers sagittate, horizontal. Ovary narrowly 
oblong, longer than the oblong 3-grooved style; stigma unequally 6-lobed, 
openly perforate. Fruit 6-celled, pendent, baccate about a papery core. 
Seeds thick, marginless, with ruminated albumen. — Low but rather 
thick trees with large rigid pungent coarsely filiferous leaves and ample 
large-bracted panicle the branches of which long end in broad bract- 
covered buds. 
Two trees to which, as it chances, no published specific 
names are applicable, though of the general habit, floral 
plan and fruit and seed characters of the baccate Yuccas, are 
distinguished from all known Yuccas in having the perianth 
distinctly tubular and gamophyllous below, with the sta- 
mens becoming free only at its throat; and these characters, 
marking a very great deviation from the floral structure of 
Yucca proper, seem to necessitate their separation from 
that genus, and the provision for them of a new genus, 
which is dedicated to my little son, Sam Farlow Trelease, 
who, in the springs of 1900 and 1902 accompanied and 
materially aided me in a field study of both speeies of 
this genus and of the Mexican and Central American 
Yuccas. 
