954 PROCEEDINGS OF THE AMERICAN ACADEMY 
1 foot long, on a peduncle 2 or 3 feet high: flowers greenish: capsule 
shorter (2 inches long) : seeds more narrowly margined. — Y. stricta, 
Sims, Bot. Mag. t. 2222. Arkansas to Louisiana and Texas. 
9. Y. FILAMENTOSA, Linn. Caudex a foot high or less: leaves 
numerous, rather rigid, straight, with short point, rough on the back, 
1} to 2 feet long by 12 to 18 lines wide (sometimes oblanceolate or 
spatulate and obtuse, 2 or 3 inches wide, concave): panicle pyramidal, 
densely flowered, glabrous, on a stout scape 4 to 9 feet high; bracts 
of the scape short, oblique, spatulate : flowers greenish white, 1 to 14 
inches long: stamens equalling the pistil: stigmas pale, elongated, at 
length recurved: capsule cuspidate, 14 inches long: seeds 3 lines 
broad. — Sims, Bot. Mag. t. 900; Baker, Saund. Ref. Bot. t. 324, 
325; Engelm. |. c. 51. Y. concava, Haw. Y. glaucescens, Haw. ; 
Sweet, Fl. Gard. t. 55. Near the coast, from Maryland to Florida 
and Louisiana. 
Var. FLACCIDA, Engelm. 1. c. Mostly stemless: leaves soft and 
flaccid, thin and flat, with a weak point and usually numerous very 
slender threads: panicle contracted, pubescent, as long as the scape: 
stigmas shorter, attenuate, connivent; capsule angled, 2} inches long: 
seeds 4 or 5 lines broad. — Y. flaccida, Haw.; Lindl. Bot. Reg. t. 1895; 
Baker, l.c., t. 323. Y¥. puberula, Haw.; Sweet, Fl. Gard. t. 21; Baker, 
lc. t. 322. Y. glauca, Sims, Bot. Mag. t. 2662; Baker, 1. «, t. 315. 
Y. exigua, Baker, 1. c., t. 314. 
Var. (?) BRACTEATA, Engelm. |]. c. Leaves rather rigid, roughish, 
with a slender sharp point: bracts of the scape larger and foliaceous, 
tapering upward: panicle contracted, half as long as the scape, rough 
or pubescent: stamens half as long as the pistil.— Coast of S. 
Carolina. 
Var. (?) LavicaTa, Engelm.1.c. Leaves fewer, smooth, rigid and 
pungent, very long (23 to 3} feet long by 10 to 15 lines wide), soon 
decumbent: scape 8 or 10 feet high, with lanceolate bracts, much 
longer than the pyramidal smoothish panicle; stigmas distinct to the 
base, deeply 2-lobed, erect. — 8. Carolina to Florida. 
x * Filaments acute, glabrous, erect : anthers broadly cordate, didymous: ovary 
obovate ; stigma capitate-peltate, hairy-papillose : capsule loculicidal : seeds 
thin, smooth, with entire albumen. —§ Hesperoyucca, Engelm. 
10. Y. Wutprier, Torr. Caudex none or very short: leaves rigid, 
serrulate, smooth, carinate, nearly flat but concave toward the apex 
and attenuate to a stout brown spine, 10 to 20 inches long by 4 to 7 
lines broad: scape 4 to 12 feet high, with imbricated sheathing bracts : 
panicle narrow and spike-like, dense, smooth: flowers greenish white, 
