. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. Sierra Blanca Yucca 159 III. SIERRA BLANCA YUCCA GENUS SAMUELA TRELEASE Species Samuela Faxoniana Trelease YiKca macrocarpa Sargent, not Engelmann Yucca Faxoniana Sargent NOWN only from the vicinity of Sierra Blanca in western Texas, this Yucca-Uke plant probably extends into adjacent Mexico. Its maxi- mum height is about 12 meters, with a trunk diameter of 6 dm. The trunk is usually simple, seldom having a few short bran
. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. Sierra Blanca Yucca 159 III. SIERRA BLANCA YUCCA GENUS SAMUELA TRELEASE Species Samuela Faxoniana Trelease YiKca macrocarpa Sargent, not Engelmann Yucca Faxoniana Sargent NOWN only from the vicinity of Sierra Blanca in western Texas, this Yucca-Uke plant probably extends into adjacent Mexico. Its maxi- mum height is about 12 meters, with a trunk diameter of 6 dm. The trunk is usually simple, seldom having a few short branches. The young plants are densely covered with numerous erect or radiating living leaves; later the base is covered by a thatch-like covering of reflexed dead leaves; on old trees the rind is exposed at the base. The rind is about 8 nam. thick, dark reddish brown, and scaly. The leaves are dark green and smooth, linear-oblong, i to m. long, stiff and firm, abruptly narrowed just above the thickened, shining red clasping base which is often dm. broad, widest at or above the middle and slightly con- cave toward the apex, which is armed with a very sharp, dark tip; the margin separates into grayish threads, which, with the exception of a few coarse fibers near the apex, eventually peel back- ward and form a persistent tangled mass at the base of the leaf. The flowers, which appear in spring, are in short- stalked, broadly conic loosely-branched panicles with persistent white bracts; they are drooping on long stalks, 5 to 10 cm. across; the perianth is funnelfomi, of 6 parts, which are broadly lanceolate, sharp-pointed, and curved inwardly at the apex, united at the base into a tube about 8 mm. long, those of the outer series narrower; stamens 6, their filaments shorter than the ovary, club-shaped, hairy, and curved outward; anthers arrow-shaped and horizontal; ovary sessile, narrowly oblong, ridged, yellowish, longer than and narrowed into the slender, grooved style; sti
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