437 
bract-like leaves, and a pyramidal few-flowered panicle with small bracts: lowers 
greenish-white, the ovate sharply acuminate segments 3 to 7 em. long: stamens 
straight, equaling the ovary: style slender: pod 6-sided, acute or beaked, 5 to 7 
cm. long: seeds 7 to 8 mm. broad. (Y. luctesens Carr.)—Sandy hills and plains, 
from San Saba and San Antonio to the Pecos and Rio Grande. Var. RIGIDA Engeln., 
of extreme western Texas, has pale and glaucous not twisted leaves keeled and often 
rough on the back (2 to 3 dim, long, 6 to 12 mm, wide), and smaller pods and seeds. 
+ + Leaf margins filamentose. 
5. ¥. glauca Fraser. Leaves straight, very stiff, pointed, usually 3 to 9 dm, long 
and 6 to 12 mm. wide, smooth: raceme usually simple, nearly sessile, 3 to 12 dm. 
long: flowers greenish-white or tinged with brown; segments broadly ovate, 2.5 to 
5 em. long: stigmas green, shorter than the ovary: pod 6-sided, 7 cm. long: seeds 10 
to 12 mm. broad, (Y. angustifolia Pursh.)—Sandy hills and plains of western Texas; 
common west of the Pecos. Var. stricta Trelease ( ¥. angustifolia, var, mollis Engelm. ), 
extending from Arkansas and Louisiana to the Rio Grande, is acaulescent, with the 
softer and less pungent leaves broadest (10 to 16mm.) in the middle, raceme or pani- 
cle (1.5 to 3 dm. long) on a peduncle 6 to 9 dm, high, greenish flowers, shorter pod 
(5 em. long), and more narrowly winged seed. 
6. ¥. elata Engelm. Caudex 9 to 15 dm. high: leaves linear, rigid, sharp 
pointed, white-margined: bracts white, oval, acute or acuminate, as long as the 
pedicels: flowers white, with ovate acute segments: ovary attenuate into a whitish 
style: pod cylindrical-ovate, obtuse, short-cuspidate: seeds large (12 mm. wide), 
narrowly wing-margined. (Y. angustifolia, var, elata Engelm. Y. constricta Baker.) 
—Dry gravelly mesas of western Texas. 
11. NOLINA Michx. 
Perennials, with a thick caudex or trunk, numerous narrowly linear 
serrulate leaves, stout nearly naked flowering stem bearing a com- 
pound racemose many-flowered panicle (the main branches subtended 
by foliaceous long-attenuate bracts), solitary pedicels, small polygamo- 
diwcious flowers with persistent whitish oblong-lanceolate segments, 
included stamens, introrse cordate-ovate anthers, very short distinct 
styles, dry and thin indehiscent fruit, and subglobose light-colored 
seeds. 
1. N. Lindheimeriana (Scheele) Watson, Stem stout, 16 to 18 dm. high, from a 
very short caudex: leaves (3 to9 dm. Jeng) flat, thin, strongly serrulate, the cauline 
15 dm. long: panicle simple or compound; bracts not conspicuoas: fruit very thin, 
emarginate at both ends, broader than long (10 mm. broad), on pedicels about 8 mm. 
long. (Dasylirion Lindheimerianum Scheele, D. tenuifolium Torr.)—Stony places, along 
the Guadalupe, and through central and western Texas to New Mexico. 
2 WN. Texana Watson. Stems several, very short (3 to 6 dm. high, including the 
panicle), from a very short caudex: leaves (6 to 12 dm. long, 2 to4.mm. wide) concavo- 
convex below, triangular toward the apex, roughish on margins, covering the 
ground: panicle compound, the main bracts foliaceous and with dilated bases: 
pod (4 to6 mm. broad) on pedicels 4 to 6 mm. long: seed globose, nearly smooth, 4 
mm. in diameter, bursting the cell.—Abundant on all foothills of western Texas. 
3. N. erumpens (Torr.) Watson. Stem 6 to 15 din. high, rough-scabrous: leaves 
thick, subcarinate, 6 to 9 dm. long (12mm. wide above base), very strongly serrulate: 
panicle compound, with large dilated bracts; the partial panicles pyramidal (15 dm. 
long); pedicels 4 mm. long or less: stigmas linear, distinct, sessile: the ripening seed 
bursting the cell. (Dasylirion erumpens Torr, )—Between the Pecos and the Rio Grande, 
11874—No. 3 7 
