254 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 1 h 

 inches long : stamens equalling the pistil : stigmas pale, elongated, at 

 length recurved : capsule cuspidate, 1 ^ inches long : seeds 3 lines 

 broad. — Sims, Bot. Mag. t. 900 ; Baker, Saund. Ref. Bot. t. 324, 

 325 ; Engelm. 1. c. 51. Y. concava, Haw. J", glaucescens, Haw. ; 

 Sweet, Fl. Gard. t. 53. 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. 1. 1895 ; 

 Baker, 1. c, t. 323. Y. puberula, Haw. ; Sweet, Fl. Gard. t. 21 ; Baker, 

 1. c, t. 322. Y. glauca, Sims, Bot. Mag. t. 2662 ; Baker, 1. c, t. 315. 

 Y. exigua, Baker, 1. c, t. 314. 



Var. (?) bracteata, Engelm. 1. 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. (?) laevigata, Engelm. 1. c. Leaves fewer, smooth, rigid and 

 pungent, very long (2| 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. — S. Carolina to Florida. 



* * Filaments acute, glabrous, erect : anthers broadly cordate, didymous : ovary 

 obovate ; stigma capitate-peltate, hairy-papillose : capsule loculicidal : seeds 

 thin, smooth, with entire albumen. — § Hesperotucca, Engelm. 



10. Y. "Whipplei, 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 1 2 feet high, with imbricated sheathing bracts : 

 panicle narrow and spike-like, dense, smooth : flowers greenish white, 



