

Refugium Botanicum. | [July, 1872. 
TAB, 314. 
Natural Order LimmtAcEx. 
TRIBE YUCCOIDE®. 
Genus Yucca, Linn. 
Y. extaua (Baker). Acaulescens, foliis 80—40 dense rosulatis 
anguste oblanceolatis 18—20 poll. longis supra medium 138— 
14 lin. latis arundinaceo-coriaceis viridibus junioribus leviter 
glaucis apice subpungentibus, marginibus integris concolori- 
bus, facie subconcavis, exterioribus recurvatis, scapo foliis 
duplo longiore, floribus pro genere laxe dispositis, perianthii 
campanulati albi sesquipollicaris segmentis oblongis cuspidatis 
duplo longioribus quam latis, filamentis puberulis 7—8 ln. 
longis apice clavatis uncinatis, ovario ampulliformi perianthio 
duplo breviore, stigmatibus ligulatis apice emarginatis ovario 
triplo brevioribus. 
Probably a native of the Southern United States. 
Acaulescent, hardy in the neighbourhood of London. Leaves 
thirty to forty in a dense basal rosette, narrowly oblanceolate, 
reaching eighteen to twenty inches long when fully developed, 
thirteen to fourteen lines broad two-thirds of the way up, rather 
firmer in texture than those of jilamentosa, narrowed upwards to 
a brownish slightly pungent point, and downwards to three to 
four lines above the base, the colour a dull green which at first 
is slightly glaucous, the face more or less concave all through, 
the back convex and scabrous, the edge concolorous and entire, 
the outer ones more or less recurved. Scape robust, twice as 
long as the leaves. Panicle oblong-lanceolate, a yard long, with 
several downy erecto-patent branches. Flowers few to a branch, 
the cernuous pedicels much shorter than the scariose bracts. 
Perianth pure white, an inch and a half deep, when fully ex- 
panded as broad as deep; the oblong cuspidate segments nine to 
ten lines broad. Lilaments five-eighths of an inch long, puberu- 
lent, curved and thickened at the apex. Ovary ampulleform, 
half as long again as the filaments, one-fourth of an inch thick. 
Stigmas one-fourth of an inch deep, ligulate, connate, emarginate 
at the apex. 
Tas. 814.—1, whole plant, reduced; 2, leaf; 8, branches with 
flowers, natural size. 4, stamens and ovary; 5, a single stamen: 
both magnified.—J. G. B. 
