114 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Our plant is related to S. biflora and 8. commutata. From the former it 
differs in its narrower and glabrous leaves, strongly deflexed peduncles, and 
larger flowers; it agrees with it, on the other hand, in the form of the stamens. 
From 8. commutata it differs in the form of the stamens, the strongly de- 
flexed peduncles, and the narrower and less prominently nerved leaves. 
ALLIACEAE. 
Allium deserticola (Jones) Wooton & Standley. 
Allium reticulatum deserticola Jones, Contr. West. Bot. 10: 30. 1902. 
Allium reticulatum as applied to plants of southern New Mexico in various 
reports by Watson, not Fraser. 
This is the largest flowered wild onion we have in the State. The flowers are 
pale pinkish to white with a darker midrib, fading to a dry papery envelope in 
fruit. The plant is found with us in the foothills of the hotter and drier moun- 
tains. It is said to extend into eastern Utah and southern Colorado. We have 
it from the mountains of the northwestern corner of the State and from the 
Organ Range. 
Allium rhizomatum Wooton & Standley, sp. nov. 
Plants about 20 em. high, arising from small, single, scaly-coated, ovate bulbs 
about 1 cm. in diameter, the outer coats grayish and opaque, the inner white 
and hyaline, having a few indistinct longitudinal nerves but not reticulate, the 
bulbs arising from slender, scaly rhizomes 2 or 8 em. long; leaves 2 or 3, gen- 
erally longer than the scape, flat, 2 to 3 mm. wide, much broader and clasping 
at the base, very finely serrulate; scape terete; spathe 2-valved, the valves 
scarious, broadly ovate, acute, at first pinkish-veined, becoming reflexed and 
white; umbels erect, few-flowered ; pedicels (in young umbels) 1 em. long or less; 
flowers small for the genus; perianth segments oblong to oblanceolate, acute, 
6 to 8 mm. long, pale with purplish or pinkish midvein, slightly carinate at the 
base; stamens about equaling the perianth, included, the filaments dilated at 
the base and coalescent; stigma simple; ovary slightly crested; fruit not seen. 
Type in the U. 8. National Herbarium, no. 690251, collected at the Gila Hot 
Springs, August 20, 1900, by E. O. Wooton. Transition Zone. 
We hesitate to name another Allium, but our material is like nothing else we 
have been able to discover, being the only species with long and slender 
rhizomes except A. glundulosum Link & Otto, which was named from central 
Mexico. All material of that species which we have seen comes from the central 
States of Mexico, not far from Mexico City, a thousand miles or more from the 
habitat of our plant, and the two are very conspicuously different. 
DRACAENACEAE. 
Yucca baileyi Wooton & Standley, sp. nov. 
Acaulescent; plants solitary; leaves very numerous, rigid, short, 25 to 30 em. 
long, 4 or 5 mm. wide or even narrower, smooth, glabrous, yellowish green, 
thick, convex on both sides near the base, toward the apex flat or shallowly 
concave on the upper surface, often triangular in cross section, armed with a 
short, stout tip, the edges of the young leaves with faint white margins, 
abundantly filiferous, the filaments soft and very slender; inflorescence a simple 
raceme 50 to 80 cm. long, stout, glabrous; lower bracts subtending the flowers 
elongated, 10 cm. long, scarious and white or purple at the base, with flat, 
green tips 4 to 8 em. long; upper bracts broad, all or nearly all with green 
herbaceous tips; pedicels stout, 2 to 3 cm. long, erect in flower and in fruit; 
