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 .5m. 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 own length. 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 X 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- 



