216 UNITED STATES AND MEXICAN BOUNDARY. 



serrate-lacerate, scarious. Perianth white ; the segments ohovate; concave. Ovary ovate, 

 obtusely triangular, one-celled, with 6 anatropous erect ovules at the base of the cavity. Fruit 

 coriaceous, narrowly winged^ indehiscent. Seed 3-8ided_, with obtuse angles, smooth. Embryo 

 cylindrical, in the axis of horny albumen, which it nearly equals in length. D. Texanum 



seems 



DAiSYLiRiON BiGELOVii, ToTv. Bot. WMpp. Rep. p. 151. Sierra del Tule y Tinaja Alta, Sonora; 

 Schott. " Stem 6 feet high, and 2-3 feet in diameter." Leaves 8-5 feet long, and nearly an 

 inch in diameter about the middle, flat ; the margin a little rough, and sometimes separating 

 into threads. " Scape 6-8 feet long. Eaceme 1-1^ foot long, and nearly a foot in diameter at 

 the base." Fruit papyraceous, 1 or 2 of the cells usually sterile, not opening by regular 

 dehiscence, but by the rupture of the thin walls. Seeds oblong-obovate, whitish, dull, slightly 

 reticulated. Embryo slender, cylindrical, in the axis of horny albumen. 



Dasylimon LiNDHEiMERiANtiM, ScTieeU in Linncea, 25, p. 362. High plains and hill sides near 

 the Copper Mines, New Mexico ; Bigelow. El Podrero, Sonora ; Schott. (No. 693, Wright, 

 No. 218, 297, 551j 552, Ltndheimer.) — All our specimens are in fruit. Leaves a yard long, and 

 about 3 lines wide towards the base, cbannelled above, rounded underneatb. Pedicels filiform, 



as 



thickened and triangular at the base of the flower. Fruit membranaceous, nearly twice 

 broad as long, and exceeding the pedicels in length, conspicuously 3-winged, only one of the 

 cells usually fertile, and this containing but a single obovate seed. — This species seems to be 

 very like D. Hartwegianum, Kunth. D. Bigelovii, which it also resembles, differs in its much 

 larger fruit, broader leaves, and short pedicels. 



Dasylikion erujvipens (n. sp.) : foliis lineari-ensiformibus e basi non attenuatis superne 

 angusto-filiformibus supia canaliculatis infra semiteretibus margine serrulato-scabris ; spathis 

 e basi lata longissime angustissimeque attenuatis ; pedicellis vix flore aec[ualibus ; fructibus 

 trilobis trilocularibus lobis carinatis vix alatis ; seminibus globosis. Hills and gravelly places, 

 western Texas and New Mexico, June. (No. 1918, Wright.) Leaves 2^-3 feet long, about 3 

 lines wide toward the base, tapering to a long, almost filiform extremity, rigid; the margin 



minute 



Panicle compound ; the spathaceous bract at the 



to a long filiform point. 



base of each primary branch dilated and clasping below, then tapering 



Pedicels jointed near the middle. Flowers white, about 2 lines long, the male (as usual) 

 bearing imperfect anthers, and the female an infertile ovary. Capsule with one or two of the 

 cells often without seeds, the angles prominent and acute, but not winged. Seeds when near 

 maturity, bursting the pod, and then remaining for some time attached to the placenta. 



IRIDACE^. 



Ikis macrosiphon, Torr. Bot. Whip. Bep. p. 144. Near San Francisco, and in Napa county, 



California, March ; Thurber. 



SiSYRiNCHiTJM Bermudiana, Ltfiu. ; var. mucrois'ATUM. San Biego, California, May ; Thurber. 

 "Western Texas ; common along the Rio Grande ; also in New Mexico, near the Copper Mines. 



S. minus, Engelm, & Gray^ {FL Lindh., No. 313^) can hardly be considered a distinct species 

 from this, as intermediate forms not unfrequently occur* 



Nemastylis acuta, Engelm. & Gray^ PL Lindh. 1, p. 27 (adnot.) N, geminiflora, Nutt. in 

 Trans. Amer. Phil. Soc. (n. ser.) 5,^. 157. Ixia acuta, Bart. FL N. Am. 1, t. 76. Western 

 Texas, Thurher. Mountains of Muerte ; Bigeloiv. 



Trifurcia c^rulea, Herh. in Bot. Mag. sub t. 3779. Prairies of the Colorado, Texas ; Wright. 



* 



