272 BOTANY. 



XEROTIDE.E. 



Dasylirion* GiUMiNiFOLiuM,t Zucc. — Caudex 4° high; scape 8-10° 

 high, 2' in diameter; leaves 2° long, G-10" wide, spiny serrated; spikes of 

 the flowering panicle subtended by lanceolate, clasping bracts; perianth 

 white or whitish; filaments much exceeding the lobes; embryo cylindrical, 

 in the centre of a hard, horny albumen and nearly as long; fruit whitish, 

 with a purple tinge, conspicuously 3-winged. — Southern Arizona (329, 655). 



Dasylirium erumpens, Torr. — Caudex and scape G° high; leaves 

 linear, 2-3° long, 4-G" wide at base, and regularly tapering to the tip, semi- 

 terete below, channelled above, edges rough; fruit 3-lobed, 3-celled, and 

 not winged (but appearing so from the diverging cells), broader than long, 

 thin, membranous, and burst by the maturing seed ; the sheathing bract at 

 base of each primary branch attenuate into a long filiform tip. — Rocky 

 Canon, Arizona {21 8). 



This my friend Mr. Watson has named Lindheimerianiun, but it cor- 

 responds so well in its fruit and leaves that I have named it as above. 



JUNCE.E. 

 By Dr. George Exgelmann. 



Juncus Balticus, Deth., y. montanus, Engelm. Revis. June, in Trans. 

 Acad. Saint Louis, 2, 442. — A smaller inland form of this species, with 

 nearly equal segments of the perigon, longer, beaked capsule, and slender, 

 pointed seeds. — Colorado; New Mexico to Nevada; Rothrock (23). 



Juncus triglumis, Linn — Caespitose, with short subulate leaves, chan- 

 nelled near the base; naked stems 3-5' high, bearing a terminal head of 2 

 or 3 flowers, enclosed in large broad bracts ; obtusish sepals shorter than 

 the oblong, obtuse, mucronate capsule; filaments many times longer than 

 the small anthers; large seeds loosely enveloped in the striated coat, appen- 



Dasyurion, Zucc.— Fl were dioecious. Male-flowers 2-3 in clusters, enclosed in thin, hyaline, 

 somewhat fimbriate bracts; pedicels 1-2" long, jointed above; perianth of fi similar white or whitish 

 divisions; filaments attached to the base of the divisions; pistil abortive. Female flowers in braeteate 

 clusters, like the male- ; ovarj sometimes 1-. sometimes 3-celled, with usually (i ovules, of which l>nt one 

 ot two mat nro into seeds. — Erect, hard herbs, with clusters of narrow, r» carved leaves crowning the 

 caudex. Scape (M4 lii^h, terminated by large masses of small flowers. The ends of the leaves usually 

 split np into white, thin, strong fibres, which could doubtless be utilized in the manufacture of cordage. 

 t Ihimjlirion gramilttfolitm, Zucc. Since the above was pnt in tj po, Mr. Watson has determined this 

 plant to be a new and clearly distinct species, which he names I). II ludiri. See note under Table oi' 

 Orders, at end of volume. 



