70 MISSOURI BOTANICAL GARDEN. 
and striately veined, and with a very narrow bright yellow 
horny margin that bears numerous very minute teeth, like 
those of Y.rupicolaand Y.rigida. The old leaves, closely 
reflexed against the stem, persist for many years as a straw- 
colored thatch-like covering, and the denuded lower stem 
is lozenge-marked by the leaf-scars and does not develop a 
thick bark. 
The glabrous panicle ranges from .5 m. long to more than 
twice that length, and is raised on a stalk 30 to 50mm. 
thick, which, though sometimes barely protruding from the 
leaves, is more commonly exserted for a length about equal 
to that of the branched part, and is sparingly bracteate, the 
narrow green lower bracts gradually passing into the dingy 
floral bracts. ‘The common outline of the flower-cluster is 
attenuate-ovoid, but not infrequently the lower part of the 
cluster, like the top, is unbranched, the uppermost and 
lowest flowers then standing in the axils of the bracts of 
the main stem. 
The rather large waxen pendent white flowers, which are 
very rarely somewhat purple-tinged, expand from 50 to 75 
mm. ‘They are slightly umbonate at base, on short curved 
pedicels which rarely reach their ownlength. The segments 
of the perianth are lance-obovate, the inner whorl somewhat 
crenulate, and the outer narrower, thicker and subentire. 
The stamens, which are somewhat clavately thickened and 
spreading near the top, are coarsely papillate-pubescent, 
as in other species of the genus. The narrowly oblong 
conical ovary is green, and the attenuate white style con- 
siderably surpasses the stamens and ends in three slightly 
notched lobes. 
The erect or suberect very firm-walled capsule, measur- 
ing about 25 < 50 mm., is oblong-acuminate with the atten- 
uate upper third of the convex carpels somewhat spreading 
in dehiscence, and is raised on a concavely obconical base, 
corresponding to that noted for the flowers, from the top of 
which remnants of the withered perianth commonly de- 
